How does a Bioretention pond work?
Bioretention basins are landscaped depressions or shallow basins used to slow and treat on-site stormwater runoff. Stormwater is directed to the basin and then percolates through the system where it is treated by a number of physical, chemical and biological processes.
What is a pond outfall?
A: When it’s just a wide spot on a stream. The defining characteristic of a detention pond is an “outfall” smaller than the inlet. The pond holds back rain in a storm and releases it later at an acceptable rate. This reduces downstream flooding.
What is bioretention project?
Bioretention areas are shallow depressions filled with sandy soil, topped with a thick layer of mulch, and planted with dense vegetation. Bioretention areas are usually designed to allow ponded water and with an overflow outlet to prevent flooding during larger storm events.
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.
What is Monk in pond?
The monk is one of the oldest and most common pond draining structures. It consists of a vertical tower closed with wooden boards to regulate the water level. The water is discharged through a pipeline buried under the dike. A screen keeps the farmed fish from leaving the pond.
What is Monk in fish pond?
In its basic form, this is simply a pipe (typically 0.060.15 m diameter) run from the interior base of the pond, through the lower pond bund, with a cap or valve at the. outer end. As with the monk drain, the pipe should be fitted with one or more collars to restrict seepage.
Are bioswales expensive?
Bioswales are generally less expensive when used in place of underground piping. Deep-rooted native plants are pre- ferred for infiltration and reduced maintenance. Soil infiltration rates should be greater than one-half inch per hour.
What is the purpose of an underdrain?
Underdrain Installation Underdrains prevent water from accumulating under the pavement and causing premature subgrade failure. Open-graded material placed directly above the underdrain helps move water out from between asphalt layers. Depth: 24”
What is the minimum slope for a detention pond?
The pond floor should have a minimum slope of 0.5% toward the outlet or underdrain system. The recommended slope is 2.0% to ensure that the pond fully drains between storm events. Provide adequate maintenance access for all dry detention ponds.
What is the size and extent of a groundwater underdrain system?
The size and extent of groundwater underdrains shall be established by a Professional Engineer, registered in the State of Colorado. The minimum size of a main line groundwater underdrain system shall be six (6”) inches and three (3”) inches in diameter for the service line.
What type of aggregate is used for underdrain?
14” For concrete pavement, Coarse Aggregate #8 is used for the drainage layer and the underdrain aggregate. The Coarse Aggregate #8 combines with the Compacted Aggregate #53 to form the subbase. Underdrain Tables
