Dry ponds: TTT

Dry ponds are found in storage element in the LID TTT.

Dry ponds are a storage element in the Treatment Train Tool.

A rainwater harvesting cistern as a storage element (key parameters)

Stage Storage
Name	Important to have a unique name, to associate with the subcatchment (harvesting area)
Storage type	No removal
Bottom elevation (m)	This will be 0 for installations at ground level, but will often be underground. This is of greater importance when the overflow is coupled to another component within a treatment train
Maximum depth (m)	Height of the RWH cistern
Lined/unlined	Lined
Evaporation factor	0
Curves
The Curves table is designed to accommodate ponds of roughly conical dimensions. Rainwater cistern are usually cuboid or cylindrical in shape, so that the area (m2) will remain the same throughout the depth. The top and bottom dimensions can be placed within the first two rows of the table.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

Tank used to store rainwater (typically roof runoff) for later use.

Stormwater management following the hierarchical approach: Source Control measures, Conveyance Control measure and End of Pipe treatment to achieve the water quality and water balance target for lot level development of the preferred strategy.

A combination of lot level, conveyance, and end-of-pipe stormwater management practices.

Rainwater harvesting.

Abiotic transfer of water vapour to the atmosphere.