What is stormwater infiltration basin?

Stormwater infiltration basins are facilities constructed within highly permeable soils that provide temporary storage of stormwater runoff. An infiltration basin may also be combined with an extended detention basin to provide additional runoff storage from both stormwater quality and quantity management.

What is an I pit?

Revision Date: 10/1/2021. What is an infiltration pit? An infiltration pit/trench is a stormwater facility much like a gravity septic system. It mitigates stormwater flows from rooftop runoff by providing a reservoir that allows for water storage and infiltration into the native soils located beneath the pit.

What is underground infiltration?

Underground infiltration systems is a general term that refers to stormwater treatment practices that temporarily store runoff below ground in geotextile-lined excavations filled with clear stone (i.e., washed gravel) or other void space forming structures and treat it by sedimentation and filtration through the …

How do you clean an infiltration trench?

Remove leaves, grass clippings, sediment, or other visible debris. Clean or replace gravel. Check pretreatment areas for erosion and reseed if needed. If there is an underdrain, open the capped access pipe and flush the pipe by running water through it from a hose.

What is a stormwater pond?

Stormwater ponds are bodies of water in commercial and residential developments that collect and store stormwater runoff. These ponds improve water quality and control water quantity. Stormwater ponds reduce pollution and prevent downstream flooding.

How does an infiltration pond work?

An infiltration basin is a water impoundment over permeable soils which receives stormwater runoff and contains it until it infiltrates the soils. These basins remove fine sediment and the pollutants associated with them. Coarse sediment must be removed from the stormwater by other methods prior to entering the basin.

What is a trench for water called?

A percolation trench, also called an infiltration trench, is a type of best management practice (BMP) that is used to manage stormwater runoff, prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay.

What is infiltration ditches?

Infiltration trenches are linear ditches that collect rain water from adjacent surfaces, and their highly permeable soils allow the water to quickly seep into the ground.

Do stormwater ponds have fish?

It is important that no fish are released into storm ponds as they can travel downstream and may harm the native species living in our rivers and creeks.

What is a stormwater infiltration BMP?

The following table provides a brief description and schematic of each stormwater infiltration BMP. A natural or constructed impoundment that captures, temporarily stores and infiltrates the design volume of water into the surrounding naturally permeable soil over several days.

How do I use stormwater infiltration on my property?

There are a number of options for using stormwater infiltration on residential properties. The most commonly used devices are: • leaky wells • retention trenches • infiltration basins • infiltration cells • seepage pipes.

What is an infiltration trench?

An infiltration trench is a shallow excavated trench, typically 3 to 6 feet deep, that is backfilled with a coarse stone aggregate allowing for the temporary storage of runoff in the void space of the material. Drawdown of this stored runoff occurs through infiltration into the surrounding naturally permeable soil.

Are infinfiltration BMPs prohibited in these areas?

Infiltration BMPs are PROHIBITED in these areas; 2 Yes for infiltration trench, limited for underground infiltration, no for dry well; 3 This is only for the portion of flow that enters the infiltration basin; by-passed runoff does not receive treatment; 4 Low = < 30%; Medium = 30-65%; High = 65 -100%); 5 Assumes adequate pre-treatment