Tips to Locate Your Drainfield
- In late summer, if you stop watering your lawn you may see green stripes in your yard.
- Do you have monitoring ports or clean-outs?
- Carefully probe the areas leading away from the septic tank.
- Look for clues such as shallow, parallel depressions, which may mark the drainfield trenches.
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Are septic tank locations public record?
Contact your local health department for public records. These permits should come with a diagram of the location where the septic system is buried. Depending on the age of your septic system, you may be able to find information regarding the location of your septic system by making a public records request.
How do you find a septic tank in an old house?
Look for the 4-inch sewer that exits the crawl space or basement, and locate the same spot outside the home. Septic tanks are usually located between ten to 25 feet away from the home. Insert a thin metal probe into the ground every few feet, until you strike polyethylene, fiberglass or flat concrete.
How far down is a leach field?
A typical drainfield trench is 18 to 30 inches in depth, with a maximum soil cover over the disposal field of 36 inches.
Can you walk on a leach field?
Your family can walk on a well-maintained drain field without fear of encountering puddles of affluent and dangerous bacteria. Bicycles and tricycles are also acceptable because they are not heavy enough to compress or disturb the soil.
How do I find out if my septic tank is registered?
Check if your septic tank is already registered You can check if your tank has already been registered by contacting your environmental regulator. If you are unsure then it is best to check and avoid making an unnecessary payment. The NIEA and SEPA have records of all registered septic tanks.
How do you find a metal detector with a septic tank?
6 Steps to Locate a Septic Tank
- Find Your Main Sewer Drain Line. Sewage from your toilets, sinks, and showers collects into a main drain line.
- Check Permits and Public Records.
- Determine Septic Tank Material.
- Time to Dig.
- Mark the Location for Future Maintenance.
How can I find out if a property is on mains drainage?
One way to find out if your property has surface water drainage is checking your property’s Title Deeds (you can do this through Gov), or looking at your original Planning Application.
Can you have a septic tank without a leach field?
The waste from most septic tanks flows to a soakaway system or a drainage field. If your septic tank doesn’t have a drainage field or soakaway system, the waste water will instead flow through a sealed pipe and empty straight into a ditch or a local water course.
How deep is a septic tank in the ground?
Septic tanks are typically rectangular in shape and measure approximately 5 feet by 8 feet. In most cases, septic tank components including the lid, are buried between 4 inches and 4 feet underground. You can use a metal probe to locate its edges and mark the perimeter.
How do you measure a drain field?
Drainfield Size
- The size of the drainfield is based on the number of bedrooms and soil characteristics, and is given as square feet.
- For example, the minimum required for a three bedroom house with a mid range percolation rate of 25 minutes per inch is 750 square feet.
Can you put pavers over drain field?
You can’t build a paver patio on top of a septic tank, and doing so could be against the planning laws of your state or local area. Septic tanks can take very little weight without getting damaged, and you’ll also need access to the tank in the future too. You shouldn’t build a deck on one either.
How to locate your septic tank and your drainfield
Septic systems on-site are used for accepting and treating wastewater in homes that are not linked to the municipal wastewater management system. A septic system is comprised of three components: a septic tank, a drain field, and piping. As a homeowner, it is your responsibility to properly operate and maintain your septic system in order to avoid system failure. For example, depending on the legislation in your area, you may be compelled to pump it on a regular basis. It is impossible to perform maintenance operations, however, if you do not know where the tank is located.
Steps to follow to locate your septic tank and drain field
The contractor that designed and constructed the septic tank on your property should have submitted an as-built diagram with the local health authority before starting work on the project. In the event that you have the contractor’s contact information, you can ask them for a schematic, which you can then use to pinpoint the location of your septic tank. If you do not have a copy of the schematic, you can request one from the local authorities. Depending on whether the installed system included electrical components, the schematic may be available at the regional building department offices.
If you are unable to locate the tank using this diagram, you will need to do more research on the land in order to determine its position.
- This pipe is commonly found in the basement of a home, and it is a 4″ black pipe with a cleanout at the bottom.
- Simply look for possible access coverings or a structure that might be concealing it.
- These pumps are used to remove waste from the building.
- It is supposed to be connected to the sewage output pipe.
- As soon as you’ve discovered the sewer outlet in your basement, you may use it to figure out where the sewer line departs your home through an outside wall.
- As a result, it is probable that the tank will be positioned around the corner from the building.
Tips for locating your septic tank
Septic tank lids should be visible from the outside. An underground riser may have been added, which will make it simple to find your septic tank in some instances.
However, it is conceivable that the septic tank cover is buried underground, which is especially true for older homes. Following are some pointers to assist you in locating the septic tank in this and other similar situations.
- It may be possible to discover the septic tank lid underneath using a metal detector if it is buried. Prevent wearing footwear that contains steel or any other metal in order to avoid interfering with the readings of the detector
- Instead, you can use a flushable transmitter that is flushed down the toilet and then tracked with a receiver. When it comes to septic tanks, the strongest signal will be seen close to the intake region of the tank.
Depending on whether the septic tank is above or below ground, you may have to dig to get to it. Construction materials for septic tanks include concrete, fiberglass, or plastic, and their shapes can range from oblong to cylindrical to rectangular. The majority of modern septic tanks will have their lids positioned in the center of the tank, and the lid should be within three feet of the ground surface in most cases. However, depending on a variety of conditions, such as farming and other human activities on the property, it is conceivable that it will be significantly deeper.
Additionally, you may use a small steel rod to probe the earth in order to pinpoint exactly where the tank is located as you continue digging.
Inspecting the tank
It is critical to thoroughly inspect and evaluate your septic tank and its contents when it has been identified. First and foremost, you may unscrew the lid to inspect the scum and sludge layer beneath it. In addition, the use of tracer dye tablets allows you to check the septic tank without having to dig it up. If you use tracer dye pills, all you have to do is flush them down the toilet and wait for a maximum of two days. Because of the way the tablets dissolve in water, if there is a problem with the septic system, you will see that the leach field has a glowing green hue surrounding it.
It is possible that someone will fall into the tank, causing significant damage or possibly death.
Conclusion
You can identify your septic tank without assistance from a professional, but it is a good idea to have someone who is properly educated in septic tank maintenance examine and maintain your septic tank on your behalf. The effluent filter in your tank should be washed into the open septic tank rather than on the ground in your yard if your tank has one. It may also be a good idea to make a note of the position of the septic tank when it has been discovered. This will be beneficial to anyone else who may require access to the septic tank in the future.
Septic tanks release combustible and hazardous gases, and as a result, they must be located in an open area.
How Your Septic System Works
Underground wastewater treatment facilities, known as septic systems, are often employed in rural regions where there are no centralized sewage lines. They clean wastewater from residential plumbing, such as that produced by bathrooms, kitchen drains, and laundry, by combining natural processes with well-established technology. A conventional septic system is comprised of two components: a septic tank and a drainfield, often known as a soil absorption field. It is the septic tank’s job to decompose organic matter and to remove floatable stuff (such as oils and grease) and solids from wastewater.
Alternate treatment systems rely on pumps or gravity to assist septic tank effluent in trickling through a variety of media such as sand, organic matter (e.g., peat and sawdust), constructed wetlands, or other media to remove or neutralize pollutants such as pathogens that cause disease, nitrogen, phosphorus, and other contaminants.
Prior to discharging wastewater into the environment, several alternative systems are designed to evaporate or disinfect the effluent.
Specifically, this is how a typical conventional septic system works:
- All of the water that leaves your home drains down a single main drainage pipe and into a septic tank. An underground, water-tight container, often composed of concrete, fiberglass, or polyethylene, serves as a septic system’s holding tank. Its function is to retain wastewater for a long enough period of time to allow particles to sink to the bottom and form sludge, while oil and grease float to the surface and produce scum. Sludge and scum are prevented from exiting the tank and moving into the drainfield region by compartments and a T-shaped outlet. After that, the liquid wastewater (effluent) exits the tank and flows into the drainfield. The drainfield is a shallow, covered hole dug in unsaturated soil that serves as a drainage system. Porous surfaces are used to release pretreated wastewater because they allow the wastewater to pass through the soil and into the groundwater. In the process of percolating through the soil, wastewater is accepted, treated, and dispersed by the soil, finally discharging into groundwater. Finally, if the drainfield becomes overburdened with too much liquid, it can flood, causing sewage to flow to the ground surface or resulting in toilet backups and sink backups. Finally, wastewater percolates into the soil, where it is naturally removed of harmful coliform bacteria, viruses, and nutrients. Coliform bacteria are a kind of bacteria that may be found in the intestines of humans and other warm-blooded animals, with humans being the most common host. As a result of human fecal contamination, it is a sign of this.
The Guadalupe-Blanco River Authority has built an animated, interactive model of how a residential septic system works, which you can view here.
Do you have a septic system?
It’s possible that you’re already aware that you have a septic system. If you are not sure, here are some tell-tale symptoms that you most likely are:
- You make use of well water. In your home, the water pipe that brings water into the house does not have a meter. In the case of a water bill or a property tax bill, you will see “$0.00 Sewer Amount Charged.” It is possible that your neighbors have a septic system
How to find your septic system
You can locate your septic system once you have confirmed that you have one by following these steps:
- Taking a look at the “as constructed” drawing of your house
- Making a visual inspection of your yard for lids and manhole covers
- Getting in touch with a septic system service provider for assistance in locating it
Failure symptoms: Mind the signs!
A bad odor is not necessarily the first indicator of a septic system that is failing to work properly. Any of the following signs should prompt you to seek expert assistance:
- Water backing up into the drains of homes and businesses
- It is especially noticeable in dry weather that the drainfield grass is bright green and spongy. The presence of standing water or muddy soil near your septic system or in your basement
- A strong stench emanating from the area surrounding the septic tank and drainfield
Types of Septic Systems
Septic system design and size can differ significantly from one neighborhood to the next, as well as throughout the country, due to a variety of variables. Household size, soil type, slope of the site, lot size, closeness to sensitive water bodies, weather conditions, and even municipal ordinances are all considerations to take into consideration. The following are 10 of the most often encountered septic system configurations. It should be noted that this is not an exhaustive list; there are several additional types of septic systems.
- Septic Tank, Conventional System, Chamber System, Drip Distribution System, Aerobic Treatment Unit, Mound Systems, Recirculating Sand Filter System, Evapotranspiration System, Constructed Wetland System, Cluster / Community System, etc.
Septic Tank
This tank is underground and waterproof, and it was designed and built specifically for receiving and partially treating raw home sanitary wastewater. Generally speaking, heavy materials settle at or near the bottom of the tank, whereas greases and lighter solids float to the surface. The sediments are retained in the tank, while the wastewater is sent to the drainfield for further treatment and dispersion once it has been treated.
Conventional System
Septic tanks and trench or bed subsurface wastewater infiltration systems are two types of decentralized wastewater treatment systems (drainfield). When it comes to single-family homes and small businesses, a traditional septic system is the most common type of system. For decades, people have used a gravel/stone drainfield as a method of water drainage. The term is derived from the process of constructing the drainfield. A short underground trench made of stone or gravel collects wastewater from the septic tank in this configuration, which is commonly used.
Effluent filters through the stone and is further cleaned by microorganisms once it reaches the soil below the gravel/stone trench, which is located below the trench.
Chamber System
Gravelless drainfields have been regularly utilized in various states for more than 30 years and have evolved into a standard technology that has mostly replaced gravel systems. Various configurations are possible, including open-bottom chambers, pipe that has been clothed, and synthetic materials such as expanded polystyrene media. Gravelless systems can be constructed entirely of recycled materials, resulting in considerable reductions in carbon dioxide emissions during their lifetime. The chamber system is a type of gravelless system that can be used as an example.
The key advantage of the chamber system is the enhanced simplicity with which it can be delivered and built.
This sort of system is made up of a number of chambers that are connected to one another.
Wastewater is transported from the septic tank to the chambers through pipes. The wastewater comes into touch with the earth when it is contained within the chambers. The wastewater is treated by microbes that live on or near the soil.
Drip Distribution System
An effluent dispersal system such as the drip distribution system may be employed in a variety of drainfield configurations and is very versatile. In comparison to other distribution systems, the drip distribution system does not require a vast mound of dirt because the drip laterals are only placed into the top 6 to 12 inches of soil. In addition to requiring a big dosage tank after the sewage treatment plant to handle scheduled dose delivery of wastewater to drip absorption areas, the drip distribution system has one major disadvantage: it is more expensive.
Aerobic Treatment Unit
Aerobic Treatment Units (ATUs) are small-scale wastewater treatment facilities that employ many of the same procedures as a municipal sewage plant. An aerobic system adds oxygen to the treatment tank using a pump. When there is an increase in oxygen in the system, there is an increase in natural bacterial activity, which then offers extra treatment for nutrients in the effluent. It is possible that certain aerobic systems may additionally include a pretreatment tank as well as a final treatment tank that will include disinfection in order to further lower pathogen levels.
ATUs should be maintained on a regular basis during their service life.
Mound Systems
Using mound systems in regions with short soil depth, high groundwater levels, or shallow bedrock might be a good alternative. A drainfield trench has been dug through the sand mound that was erected. The effluent from the septic tank runs into a pump chamber, where it is pumped to the mound in the amounts recommended. During its release to the trench, the effluent filters through the sand and is dispersed into the native soil, where it continues to be treated. However, while mound systems can be an effective solution for some soil conditions, they demand a significant amount of land and require regular care.
Recirculating Sand Filter System
Sand filter systems can be built either above or below ground, depending on the use. The effluent is discharged from the septic tank into a pump compartment. Afterwards, it is pushed into the sand filter. The sand filter is often made of PVC or a concrete box that is filled with a sand-like substance. The effluent is pushed through the pipes at the top of the filter under low pressure to the drain. As the effluent exits the pipelines, it is treated as it passes through the sand filtering system.
However, sand filters are more costly than a standard septic system because they provide a higher level of nutrient treatment and are thus better suited for areas with high water tables or that are adjacent to bodies of water.
Evapotranspiration System
Evaporative cooling systems feature drainfields that are one-of-a-kind. It is necessary to line the drainfield at the base of the evapotranspiration system with a waterproof material. Following the entry of the effluent into the drainfield, it evaporates into the atmosphere. At the same time, the sewage never filters into the soil and never enters groundwater, unlike other septic system designs. It is only in particular climatic circumstances that evapotranspiration systems are effective. The environment must be desert, with plenty of heat and sunshine, and no precipitation.
Constructed Wetland System
Construction of a manufactured wetland is intended to simulate the treatment processes that occur in natural wetland areas. Wastewater goes from the septic tank and into the wetland cell, where it is treated. Afterwards, the wastewater goes into the media, where it is cleaned by microorganisms, plants, and other media that eliminate pathogens and nutrients. Typically, a wetland cell is constructed with an impermeable liner, gravel and sand fill, and the necessary wetland plants, all of which must be capable of withstanding the constant saturation of the surrounding environment.
As wastewater travels through the wetland, it may escape the wetland and flow onto a drainfield, where it will undergo more wastewater treatment before being absorbed into the soil by bacteria.
Cluster / Community System
In certain cases, a decentralized wastewater treatment system is owned by a group of people and is responsible for collecting wastewater from two or more residences or buildings and transporting it to a treatment and dispersal system placed on a suitable location near the dwellings or buildings. Cluster systems are widespread in settings like rural subdivisions, where they may be found in large numbers.
What You Need to Know About Your Septic System’s Drainfield
In the absence of a municipal sewer system, the likelihood is that you are utilizing an aseptic system for all of your wastewater disposal. It is your septic tank that is emptied every time you flush the toilet or when water drains down the drain from sinks or the laundry. Residential septic systems are available in a variety of configurations, but they invariably include an aseptic tank, into which wastewater is channeled for treatment, and a drainfield, into which effluent evaporates or drains into the ground.
What Is a Septic System Drainfield?
In order for a septic system to work correctly, drainfields, also known as leach fields or absorption fields, must be installed. Drainfields collect and manage wastewater that has been pumped from the septic tank and are thus essential. They are comprised of perforated pipes that are buried two to four feet underground and lead away from the tank. Septic tanks would overflow if a drainfield was not there, resulting in runoff and a foul stench in your yard.
Whenever everything is operating properly, the soil in the drainfield filters the wastewater, and naturally occurring bacteria and microorganisms decompose the solid waste. Drainfields, much like any other component of your septic system, require regular attention and upkeep.
What Are the Signs There Is a Problem With Your Drainfield?
- Waste smells, particularly outside in the vicinity of the septic tank and drainfield
- Predominant presence of dark green, luxuriant flora covering the drainfield It may be visually appealing, but it indicates a severely overburdened septic system. It’s possible to have wet, soggy, or spongy regions over your septic tank or drainfield even in dry weather. It’s possible that you’ll discover puddles of standing water. Kitchen and bathroom drains that are too slow
- Toilets that are overflowing or sewage backups
What Are the Causes of These Problems?
A drainfield can live for 50 years or longer if it is properly cared for and maintained. However, several of the indications listed above might indicate that a drainfield is beginning to fail. The system just does not have the capability to take any additional garbage. Sewage backups, a foul stench outdoors, and sluggish drainage within your house are all possible consequences of this.
Crushing damage
When erected over a drainfield, heavy objects such as a shed, animals, or automobiles can cause the pipes below to get damaged or destroyed. Compaction of the soil can also be caused by an excessive amount of weight on the drainfield. Wastewater cannot be adequately absorbed in compacted soil, resulting in the occurrence of many of the symptoms described above.
Pipes are blocked
A possible source of obstruction is the infiltration of tree and plant roots into sewer lines, which prevents wastewater from draining correctly. The accumulation of sludge and the flushing of objects that should not be flushed down the toilet can also cause clogging of pipes.
The septic system is overloaded
Doing multiple loads of laundry on the same day as running the dishwasher might cause the septic system to become overburdened. A leaky faucet or a gurgling toilet might also be problematic. Time is required by all septic systems in order for the effluent to pass through the treatment procedures. It is otherwise necessary to compel wastewater to flow into the drainage field at a quicker pace than the drainage field is capable of handling. This can result in standing water or the mushy, spongy conditions described above.
Gutter downspouts draining over the drainfield
Having gutters that drain across the septic system drainfield makes it more difficult for the drainfield to absorb wastewater and perform its function. This might result in a squishy region that is constantly wet or standing water.
What to Do to Maintain a Healthy Drainfield
- Heavy machinery, automobiles, recreational vehicles, boats, grazing animals, and structures should be kept away from the area above your drainfield. Planting trees or other plants over your drainfield might cause harm to the pipes since the roots will grow into them. Make certain that all gutter downspouts are directed away from the drainfield. Every two to three years, have your septic tank pumped. Solids are conveyed into the drainfield by the absence of frequent pumping, resulting in blockage of the pipes. Apart from the waste that comes out of your body, the only item that should be flushed down the toilet is toilet paper. Other solids should not be flushed. Additionally, refrain from dumping any fats, oils, or grease down your drains. You should space out your laundry and dishwashing days so that you don’t overburden your septic system.
SEPTIC-TANK DRAIN FIELDS: WHAT YOU SHOULD KNOW ABOUT PROTECTING THEM FROM HARM
While a septic system may appear to be impenetrable, the fact is that neglect may cause severe damage, which may even result in a complete shutdown of the system. Septic systems may give many years of reliable service if properly maintained, but they can also be completely damaged by reckless actions. The drain field is an element of your septic system that is particularly prone to failure. More information on this crucial component, as well as numerous important measures that will help to keep your drain field in good condition, may be found in the sections below.
- Generally speaking, a septic drain field is the region where effluents, which are liquid waste products produced by the system, are discharged into the soil, after which the liquid waste products seep through the soils around the area.
- From a structural standpoint, drain fields are composed of many parallel pipelines that empties into a particular substrate that is buried several feet beneath the surface.
- It is for this reason that being vigilant in protecting the septic drain field is so critical to success.
- Because drain fields are so critical to the overall health of a septic system, you must take a proactive approach to prevent them from being damaged or destroyed.
- Keep impurities out of the system that might clog it.
- Never put grease, oil, or other scum-forming compounds into the septic system in order to avoid this situation from developing.
- Instead, direct gray water to a sump pump that will be used solely for disposal.
Drain-field components are often only a few feet below ground level, making them accessible to things that might create a clog or other problems.
Among the other potentially harmful aspects are storage sheds and pavement that is too close to the drain field; anything that creates long-term weight stresses on drain fields should be avoided.
Keep biological activity at a high level.
It is possible to disrupt this activity by killing beneficial microorganisms and cause an imbalance in the environment, which may result in the cessation or reduction in the effectiveness of filtering and cleansing of effluent.
Detergents, pesticides, insecticides, fertilizers, and other potentially toxic compounds are examples of such agents.
On a regular basis, carry out the necessary “upstream” maintenance tasks.
However, even in the absence of dangerous chemicals being introduced into the effluent, the regular processes occurring inside a septic system might eventually result in the closure of drain fields.
Effluent filters, for example, should be cleaned and replaced on a regular basis.
Another important maintenance operation is the pumping out of accumulated sludge that has developed at the tank’s bottom.
Regular pumping of tanks, which may be as often as once a year, is necessary to prevent sludge from departing the tank and contaminating the drain-field lines and causing a backup.
Septic drain field – Wikipedia
Septic drain fields, also known as leach fields or leach drains, are subsurface wastewater disposal facilities that are used to remove contaminants and impurities from the liquid that emerges after anaerobic digestion in an aseptic tank. Septic drain fields are also known as leach fields or leach drains. Microbial ecosystems decompose organic molecules in liquids by using them as energy sources. Aseptic systems are made up of a septic drain field, an aseptic tank, and any related plumbing. An arrangement of trenches with perforated pipes and porous material (oftengravel) topped with a layer of soil to prevent animals (and surface runoff) from getting the wastewater spread inside those trenches is characteristic of a drainage field.
A septic reserve area is a piece of land that has been set aside for the purpose of constructing a septic drain field (SRA).
These are more common in dry regions because the waterflow on the surface allows for irrigation (and fertilization) of agricultural land, which is beneficial in droughts.
Design
A drainage field is being constructed. Many health agencies demand an apercolation test (also known as a “perc” test) to determine if drain field soil is suitable for receiving septic tank effluent. To build a system that meets these requirements, an engineer, a soil scientist, or a licensed designer may be necessary to collaborate with the local governing agency. Direct monitoring of the soil profile provides a more progressive method of determining the size of leach fields. During this observation, the engineer examines a variety of soil characteristics, including texture, structure, consistency, pores/roots, and so on.
When wastewater is transported away from the drain field before pathogens are killed, coarse soils such as sand and gravel can be used.
Tests for percolation are conducted to determine the pace at which clean water disperses down a disposal trench and onto the surrounding soil.
These include:
- Septic tank effluent will be adhered to soil particles by microbial colonies that are catabolizing soluble organic compounds from the effluent. This will diminish the interstitial space available for water movement between soil particles. When these colonies colonize the soil interface of the disposal trench, they tend to produce a biofilm of gelatinous slime with a limited permeability. A buildup of insoluble particles that are too small to be carried through the septic tank will occur at the soil interface of the disposal trench, while non-biodegradable particles such as synthetic fibers from laundry, mineral soil from washing, or bone and eggshell fragments from refuse will remain to fill the interstitial spaces that were previously available for water flow out of the trench. Flowing cooking fats or petroleum products emulsified by detergents or dissolved by solvents can pass through prior to anaerobic liquefaction when the septic tank volume is insufficient to provide adequate residence time, and they may congeal as a hydrophobic layer on the soil interface of the disposal trench. The availability of hydraulic head (or vertical distance) may be reduced as a result of rising groundwater levels, forcing gravity water flow away from the disposal trench. It is possible that effluent running downward from the disposal trench will eventually reach groundwater or impermeable rock or clay, prompting a change in direction to horizontal movement away from the drain field. In order for gravity force to overcome viscous frictional forces preventing flow through porous soil, a specified vertical distance between the effluent level in the disposal trench and the water level applicable when the effluent leaves the drain field must be maintained. If groundwater levels surrounding the drain field approach the level of effluent in the disposal trench, effluent levels in the region of the drain field will increase toward the ground surface in order to maintain the vertical distance difference
- Frozen ground may diminish the cross-sectional area available for flow or evaporation on a season-to-season basis.
Catabolic design
Similarly, septic tanks are designed to hold anaerobic organisms capable of liquefying anticipated amounts of putrescible materials in wastewater, and drain fields are designed to hold aerobic soil microorganisms capable of decomposing the effluent from anaerobic septic tanks and releasing aerobic water into the environment. When effluent has not been entirely oxidized before reaching surrounding wells or surface waters, smells of hydrogen sulfide or iron bacteria may be detected in such places.
Groundwater flows through the aquifer soils around the drain field, islaminarin the process.
Diffusion of soluble organic compounds into groundwater is controlled by Molecular diffusion, which also controls the transport of oxygen from underlying groundwater or the capillary fringe of the groundwater surface to microorganisms capable of catabolizing dissolved organic compounds that remain in the effluent plume.
Biofilter
Similarly, septic tanks are designed to hold anaerobic organisms capable of liquefying anticipated amounts of putrescible materials in wastewater, and drain fields are designed to hold aerobic soil microorganisms capable of decomposing the effluent from anaerobic septic tanks and releasing aerobic water into the surrounding environment. When effluent has not been entirely oxidized before reaching surrounding wells or surface waterways, smells of hydrogen sulfide or iron bacteria may be detected in the water.
Aquifer soils surround the drain field, and groundwater flow islaminars through them.
Diffusion of soluble organic compounds into groundwater is controlled by Molecular diffusion, which also controls the transport of oxygen from underlying groundwater or the capillary fringe of the groundwater surface to microorganisms capable of catabolizing dissolved organic compounds remaining in the effluent plume.
Operation and maintenance
A septic drain field that has been exposed due to erosion
Dosing schedules or resting periods
Several distinct disposal places for effluent from a single septic tank can be provided by a drain field, which can be constructed to accommodate several septic tanks. It is possible for one region to be “rested” while effluent is channeled to another location. When the anaerobic septic tank effluent is no longer accessible, the nematode colony in the resting drain field continues to feed on the biofilm and lipids that have formed in the field. As the organic material that has collected in the soil is oxidized, this natural cleaning process may help to prevent bioclogging and increase the hydraulic capacity of the field by expanding the accessible interstitial area of the soil.
Inappropriate wastes
Microorganisms in septic tanks and drain fields have very limited ability to catabolize petroleum products and chlorinated solvents, and they are incapable of removing dissolved metals, despite the fact that some metals may be absorbed into septic tank sludge or drain field soils, and their concentrations may be diluted by other groundwater in the vicinity of the drain field (see Figure 1). It is possible that cleaning formulas will affect the efficiency of the drain field. The use of laundry bleach, as well as sanitizing and deodorizing chemicals, may have a comparable effect on microbial activity in the drain field.
Drain cleansers, such as those made from detergents or solvents, can help to transport emulsified, soapified, or dissolved fats into the drain field before they can be catabolized into short-chain organic acids by the bacteria that live on the surface of the wastewater treatment plant scum layer.
See also
- Onsite sewage facility
- Reuse of human excreta
- Sewer
- Sewage treatment
References
- Steel, E.W.McGhee, Terence J. “Water Supply and Sewerage”McGraw-Hill Book Company (1979)ISBN0-07-060929-2pp.576-577
- ABBREVIATED PROCESS(PDF), Bel Air, Maryland, USA: Harford County Health Department, October 2014, retrieved4 April2020:CS1 maint: url-status (link)
- Alth, MaxCharlotte Water and Waste-water Technology” John Wiley & Sons (1975)ISBN0-471-34726-4pp.407-408
- Linsley, Ray K. and Franzini, Joseph B. “Water-Resources Engineering (2nd Ed.)” McGraw-Hill Book Company (1972)ISBN978-0-07-037959-6, p.88
- Linsley, Ray K. and Franzini, Joseph B. “Water-Resources Engineering” McGraw-Hill Perry, Robert H., Chilton, Cecil H., and Kirkpatrick, Sidney D. “Chemical Engineers’ Handbook (4th Ed.)” McGraw-Hill Book Company (1963), p.14-13
- Perry, Robert H., Chilton, Cecil H., and Kirkpatrick, Sidney D. “Chemical Engineers’ Handbook (4th Ed.)” McGraw-Hill Book Company (1963), p.14-13
- Perry, Robert H.
External links
- At Wikimedia Commons, you can find images and videos connected to septic drain fields.
Locate Your Drainfield
You know your septic system drainfield is out there� but just where is it? It is important to locate it so you can avoid damaging it by: |
- Building a road over the drainfield
- Parking or operating heavy equipment on the drainfield
- Planting trees or bushes in close proximity to a drainfield is prohibited. Creating soil disturbances through a landscaping project or the presence of cattle
In addition, knowing where your drainfield is located allows you to inspect the drainfield for symptoms of trouble, such as damp soil and foul aromas. You should obtain a copy of the record sketch for your particular system. It is a diagram that shows where the various components of your septic system are placed. This diagram was previously referred to as a “as-built” or “record drawing.” You can obtain further information by contacting the Thurston County Permit Assistance Center (PAC) at 360-786-5490 or by downloading the Request for Record Drawing/Permit Information form.
SW in Olympia, Washington (PAC Hoursof Operation-LimitedHours Please Check Before You Leave).
This is the tax identification number that appears on your county tax bills.
(If you do not know your tax parcel number, contact the County Assessor’s office.) The level of detail and quality of the record drawings varies substantially.
a more recent diagram will indicate the tank, drainfield, replacement area (which will be used in the future if a replacement field is required), and any additional components of your system, such as a pump chamber or mound It is also possible to record the dimensions of the tank and the length of the drainfield lines.
- If you don’t water your grass in the late summer, you may notice green stripes in your yard as a result. These are the regions that are prone to flooding along the drainfield pipes. When it is cold outside, the regions above your pipes may be the first spots where frost melts in your yard. Do you have any ports for monitoring or clean-outs? These are tubes or pipes with a white cap that are cut off at or near the ground level. Drainfield pipes include liquid level indicators that are situated at the ends of the pipes, which allow you to monitor the amount of liquid in the pipes. Examine the regions leading away from the septic tank with great caution. Avoid the use of heavy steel wrecking bars or other probing equipment that might cause damage to the septic tank top or other components of the system. Take note of any signs you see, such as shallow, parallel depressions that may indicate drainfield trenches. The installation of a drainfield among huge trees or in particularly rough terrain is quite unlikely. Examine the area beneath the home where the sewer line emerges from the foundation. The septic tank is typically located within 10 feet of the foundation
- However, this might vary. Engage the services of a competent business to send down echo-locators
The Drainfield
The drainfield is a network of perforated pipes (or “laterals”) laid in gravel-filled trenches or beds. After solids settle in the septic tank, the liquidwastewater (oreffluent) is discharged, either by gravity or pressure,to an absorption field, also known as a drainfield or leachfield (seediagram of septic system/drainfield layout).NOTE:In most gravity systems the wastewater first flows into a distribution box (d-box) or tee, which then disbursesthe effluent equally among the trenches in the drainfield, which is where the final treatment takes place.Effluent trickles out of the pipes, through the gravel layer, and into the soil where further treatment occurs. Thesoil filters the wastewater as it passes (or “percolates) through the pore spaces and the soil microbes treat itbefore it eventually enters the groundwater. These processes work best where the soil is somewhat dry, permeable, and contains plenty of oxygen for several feet below the drainfield.The drainfield is generally located in a stretch of lawn in the back or side yard of a property. The size and type of drainfield depends on the estimated daily wastewater flow and local soil conditions. |
The Soil
The soil under the drainfield is responsible for the ultimate treatment and disposal of the septic tank effluent once it has been treated. Upon entering the soil, organisms in the soil purify and decontaminate the effluent before it percolates downhill and outward, eventually entering groundwater or surface water. This is because different types of soil have different capacities for treating wastewater. For example, clay soils may be too tight to allow much wastewater to pass through, whereas gravelly soils may be too coarse to give much treatment.
Replacement (Reserve) Area
Every new residence or business that will be served by a septic system must have a specified replacement or reserve space set aside for it. This is a specified area appropriate for the installation of a new drainfield, and it must be handled in the same manner as your current drainfield. A reserve area should have been declared as part of the permission procedure for any sewage system that was constructed after 1980. By the time your septic system has failed, it is too late to correct the situation by pumping your tank.
This is why it is critical to understand where the replacement area is located and how to preserve it (for more information on replacement area care, see “Drainfield Do’s and Don’ts”). For further information, visit Landscaping Your Drainfield and Choosing a Drainfield Location.
Do These Things
- Find out where your drainfield and replacement area are before you start. It is much easier to safeguard anything when you know where it is located. Locate Your Drainfield. Heavy machinery should be kept away from your drainfield. There should be no parking or driving over the drainfield by cars or heavy equipment
- This might cause cracks in the pipes. If the area is accessible to automobiles, cattle, or heavy equipment, put up a barrier. Reduce your water consumption to a bare minimum. Drainfields are not capable of carrying an endless amount of water. It is impossible for the system to drain and filter effluent when there is more water than it can absorb. This results in the effluent reaching groundwater. Water should be diverted away from the drainfield. Roof runoff and drainage ditches can saturate the soil, causing it to become waterlogged. It is most effective for drainfields to operate when the soil underneath the drainfield is not waterlogged. Maintain a minimum distance of 30 feet between trees and bushes and the drainfield. Please keep in mind that some soil conditions may dictate that plants be placed at an even greater distance from the drainfield.) Drainfields are a common habitat for trees and plants because their large root systems are attracted to and develop in moist places. Drain pipes might get blocked and damaged as a result of this. Landscape Your Drainfield. Over the drainfield, only grass or shallow-rooted plants should be planted. This will prevent soil erosion from occurring. Protect the area where your replacement will be installed. It is possible that this is the only spot with appropriate soil conditions in the event that you need to rebuild, repair, or expand the drainfield. All of the solutions made above are applicable to the replacement area as well
Don’t Do These Things
- Don’t construct anything on top of your drainfield. Patios, carports, and other constructions are included in this category. It is possible that you will cause harm to the drainfield. Do not construct a road over the drainfield. Drainfields require air in order to operate correctly. Biological breakdown and treatment of sewage need the use of oxygen. Make sure you don’t dig up your drainfield. It is possible that the pipes will be damaged
- Large animals and livestock should be kept away from the drainfield. Soil compaction hinders oxygen from getting into the soil and water from moving away from the drainfield
- It also causes erosion. It is not permissible to apply landscaping plastic over the drainfield. Air is required for the drainfield to work properly
- Otherwise, it would fail. Planting a food garden over a drainfield is not recommended. As a result, there is the chance of food contamination. Installing an irrigation system in the drainfield is not recommended. Additionally, the irrigation system should not drain toward the drainfield.
Please call a trained septic specialist for additional evaluation if you detect any of the following indicators of a potential failure or if you have any reason to believe your system is experiencing issues. Please contact Thurston County EnvironmentalHealth at 360-867-2673 if your septic system should fail.
- Odors, surface sewage, or damp areas in the drainfield region are all signs of a problem. Backups from the plumbing or septic tank (which are often a dark liquid with a foul odor)
- Fixtures that take a long time to drain
- The plumbing system is making gurgling sounds. Your drainfield may be failing if you have a well and tests reveal the presence of coliform (bacteria) or nitrates in the water from it. Even in dry weather, there will be a pool of liquid over the drainfield. This might imply that an excessive amount of wastewater is being transported upward via the soil rather than downward.
- Landscape Drainfield Planting Suggestions and other landscaping information are welcome. Identifying and Locating Your Drainfield How to determine the location of your drainfield
- Drainfield Frequently Asked Questions Drainfields are frequently asked questions, so here are some answers. Request for Drawing Permit Information for Record Drawings
How a Septic System Works – and Common Problems
This Article Discusses Septic Tanks are a type of septic tank that is used to dispose of waste. Field Sizing and System MaintenanceProblems with the Leach FieldSystem Performance Questions and comments are welcome. See Also: Septic System Frequently Asked Questions Articles on SEPTIC SYSTEM may be found here. In locations where there are no municipal sewage systems, each residence is responsible for treating its own sewage on its own property, which is known as a “on-site sewage disposal system,” or septic system, more popularly.
One of the most commonly seen types of leach field is composed of a series of perforated distribution pipes, each of which is placed in a gravel-filled absorption trench.
SEPTIC TANK
The wastewater is collected in the septic tank once it has been discharged from the residence. Septic tanks are normally between 1,000 and 2,000 gallons in capacity and are composed of concrete, strong plastic, or metal, depending on the model. Highly durable concrete tanks, which should endure for 40 years or more provided they are not damaged, are the most common. Many contemporary tanks are designed with two chambers in order to maximize efficiency. Household wastewater is collected in the septic tank, where it is separated and begins to degrade before being discharged into the leach field.
- In the tank, oil and grease float to the top of the tank, where they are known as scum, while solid waste falls to the bottom, where they are known as sludge.
- Bacteria and other microorganisms feed on the sediments at the bottom of the tank, causing them to decompose in an anaerobic (without oxygen) process that begins at the bottom of the tank.
- Solids and grease must be pushed out of the system on a regular basis in order for it to continue to function effectively.
- Each gallon added to the tank results in one gallon being discharged to the leach field, leach pit, or other similar treatment facility.
A large amount of water delivered too rapidly to the tank may discharge untreated effluent, along with oil and particulates, into the leach field, where it may block the field and cause a backup.
Leach Field
When used properly, a leach field (also known as a “drain field”) is a series of perforated pipes that are typically buried in gravel trenches 18 to 36 inches below grade — deep enough to avoid freezing, but close enough to the surface that air can reach the bacteria that further purify the effluent (see illustration below). As little as 6 inches might separate you from the ground surface, depending on your soil type and municipal regulations. It is customary to cover the perforated pipes with approximately two inches of gravel and a layer of topsoil that is 18 to 24 inches in depth.
- Grass is often sown above the ground.
- The leach field is comprised of rows of perforated pipes in gravel trenches that are used to spread wastewater over a vast area in order to further purify it.
- A bacteria-rich slime mat forms where the gravel meets the soil, and it is responsible for the majority of the water purification work.
- Despite the fact that wastewater freezes at a far lower temperature than pure water, freezing is still a hazard in cold areas.
- The leftover pathogens are converted into essential plant nutrients by these organisms, while sand, gravel, and soil filter out any solids that remain.
- If the system is operating effectively, the filtered wastewater will return to the aquifer as naturally clean water that is suitable for human consumption at this stage.
- Alternative systems may be permitted in situations when traditional leach fields are unable to function properly owing to poor soil conditions or a high water table.
- Special systems may also be necessary in regions where there are flood plains, bodies of water, or other ecologically sensitive areas to protect against flooding.
SIZING THE LEACH FIELD
Using perforated pipes put in gravel-filled trenches, the drain field is sized to accommodate the number of beds in the house. In order for the system to function successfully, the leach field must be appropriately sized for the soil type and amount of wastewater, which is normally determined by the number of bedrooms in the house. In order for the liquid to seep into the soil, it must be permeable enough to do so. As a result, the denser the soil, the larger the leach field that is necessary.
- Better to have surplus capacity in your system than to have it cut too close to the bone.
- Septic tank backup into your house, pooling on the surface of the earth, or polluting local groundwater are all possibilities if the ground is incapable of absorbing the liquid.
- Dense clay soils will not absorb the liquid at a sufficient rate, resulting in a backlog.
- If the soil is mostly composed of coarse sand and gravel, it might drain at such a rapid rate that untreated sewage can poison the aquifer or damage surrounding bodies of water.
- Alternative systems may be permitted in situations when traditional leach fields are unable to function properly owing to poor soil conditions or a high water table.
These systems sometimes cost twice or three times as much as a regular system and require significantly more upkeep. Near flood plains, bodies of water, and other ecologically sensitive places, special systems may also be necessary to protect people and property.
SEPTIC SYSTEM CAREMAINTENANCE REQUIRED
If you take good care of your system, you will be rewarded with years of trouble-free operation. Pumping the septic tank on a regular basis is necessary to remove the particles (sludge) and grease layer (scum) that have built up in the tank. The solids will ultimately overflow and spill into the leach field, decreasing its efficacy and diminishing its lifespan if this is not done. The rehabilitation of a clogged leach field is difficult, if not impossible; thus, constant pumping is essential!
- Cooking fats, grease, and particles may also wash into the leach field if the tank is too small for the amount of water being used or if the tank is overcrowded on a regular basis.
- Extra water from excessive residential consumption or yard drainage can overwhelm the system, transporting oil and particles into the leach field and causing it to overflow.
- In addition, don’t try to complete a week’s worth of laundry for a family of five in a single day.
- To minimize overburdening the system, the following measures should be taken:
- Distribute your washing loads and other high-water-use activities across the week
- And In the kitchen and bathroom, use low-flow appliances, faucets, and fixtures. Toilets, in general, are the source of the greatest amount of water use. Water should be diverted away from the leach field from the yard, gutters, and basement sump pumps.
Also, refrain from flushing solids, harsh chemicals, and just about anything else down the toilet or sink other than biological waste and white toilet paper. Also, refrain from using garbage disposals in the kitchen. If you really must have one, keep it for small non-meat bits only. Avoid flushing chemicals or paints down the toilet since many chemicals can kill beneficial microorganisms or cause water pollution in the surrounding area.Avoid flushing the following down the toilet:
- Grease, fats, and animal scraps
- Paints, thinners, chemicals, and pharmaceuticals
- And a variety of other materials sanitary napkins, tampons, and other supplies Paper towels and disposable diapers are examples of such products. Egg shells, coffee grounds, and nut shells are all good options. Antibacterial soaps and antibiotics are available.
It is preferable to put grass over the leach field and to refrain from driving or parking in the vicinity. Excessive weight placed on top of the drain field might compress the earth, diminishing its efficiency as a drain field. Drain pipes can also become clogged by trees and plants with invasive roots. In order to prevent damage to the leach field, the following measures should be taken:
- Heavy machinery should not be driven, parked, or stored on top of the leach field (or septic tank). Placement of a deck, patio, pool, or any other sort of construction over the leach field is prohibited. Remove any large trees or other plants with deep roots from the leach field. Grass is the most effective groundcover.
Even with careful use and routine maintenance, however, leach fields are not guaranteed to survive indefinitely. It is inevitable that the soil will get saturated with dissolved elements from the wastewater, and that the soil will be unable to absorb any more incoming water. The presence of an odorous wet area over the leach field, as well as plumbing backups in the house, are frequently the first indicators that something is wrong. Many municipalities mandate septic system designs to incorporate a second “reserve drain field” in the case that the first field fails.
A well constructed and maintained system should last for at least 20 to 30 years, if not longer than that. After a few tears, the initial field will naturally heal and may be used once again when the situation calls for it to be. More information on Septic System Maintenance may be found here.
SEPTIC SYSTEM PERFORMANCE PROBLEMS
Poor original design, abuse, or physical damage, such as driving heavy trucks over the leach field, are the root causes of the majority of septic system issues. The following are examples of common situations that might cause a septic system to operate poorly: Plumbing in the home. obstructed or insufficient plumbing vents, a blockage between the home and the septic tank, or an insufficient pitch in the sewer line leading from the house are all possible causes. Sewage tank to leach field connection Septic tank and leach field blockage caused by a closed or damaged tank outlet, a plugged line leading to the leach field caused by tree roots, or a blockage caused by sediments that overflowed from the tank Piping in the leach field.
Most of the time, tree roots do not make their way through the gravel bed and into the perforated pipe.
Reduced flows, achieved through the use of flow restrictors and low-flow faucets and fixtures, may be beneficial.
Because of the seasonal high water table, the soil around the trenches might get saturated, reducing the soil’s ability to absorb wastewater.
This may frequently be remedied by adding subsurface drains or curtain drains to intercept the water flow into the leach field region and to lower the water table in the immediate area around the drainage system.
Likewise, see: In order to do a perc test, who should I hire?
Is It Possible for Septic Systems to Last a Lifetime?
Performing an Inspection on a Septic System When Is the Best Time to Take a Perc Test?
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