Detension Basins
Stormwater infiltration
In some instances, the infiltration of stormwater into the ground, at rates beyond those occurring naturally, is encouraged. This is done to reduce minor flooding and to enhance receiving water quality, by reducing the amount of surface runoff and ...
Detention basin property sheets (superseded)
The setting out of information defining detention basins has changed twice during the life of the DRAINS program. You might encounter older models that include basins set out in superseded formats. DRAINS will still run with these, but it is best to ...
High early discharge (HED) pit
For on-site detention of stormwater, in the 1990s the Upper Parramatta River Catchment Trust in Sydney developed a storage arrangement that allows a control pit to fill quickly. This provides a relatively high head to make water flow out at a peak ...
Elevation-area relationship
A relationship between elevation and storage volume is required to perform detention basin routing calculations. This is obtained by defining areas of horizontal 'slices' through the volume in which water is stored from polygons drawn in CAD ...
Detention basins (retarding basins, compensation basins, balancing ponds)
Stormwater detention storages are often provided to reduce peak flowrates and to improve stormwater quality. They slow down flows and allow some sediments and pollutants to settle out. They can take many forms. Most commonly in Australia they have a ...
Detention basin volumes
Detention basin storages can take many shapes, from natural landforms to shapes such as prisms and wedges. Volumes are calculated by taking horizontal 'slices' and calculating the volume of each slice by averaging the surface areas at the top and ...
Detention basin drawing tool
This tool, , allows you to place a detention basin in the Main Window. When you select it, the arrow cursor changes to a pencil. Right-click your mouse to place a detention basin where you wish to locate it. The detention basin symbol will appear. To ...
Detention basin property sheet
In this sheet, you must specify an elevation-surface area relationship (or an elevation-volume relationship), select the type of low-level outlet and if necessary, enter data for the low-level outlet of the basin. The characteristics of basin outlets ...