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Low Impact Development controls can be modeled in Bentley CivilStorm, SewerGEMS and SewerCAD. StormCAD and the GVF-Rational solver are peak flow (steady state) only. See more here: Can I use a low impact development (LID) controls in StormCAD?
Low-Impact Development (LID) is a term used in the US and Canada to describe a more eco-friendly land planning and design approach to stormwater management. In the United Kingdom, this approach is referred to sustainable urban drainage systems (SUDS), and in Australia, it's called water-sensitive urban design (WSUD). The US terminology is used in this software and its documentation.
LID controls help developed watersheds or sites to retain or enhance pre-development hydrologic characteristics through the use of techniques that conserve natural systems and hydrologic functions.
Some of the goals of LID are to:
A number of government agencies, universities, and other groups publish educational information, research and design guidance for implementing LID and LID controls. Places to start include:
Low Impact Development Types
LID control is represented by a combination of vertical layers, which may include (in top to bottom order):
Defining Low Impact Development Control
Controls are defined in the LID Controls editor
Model performs moisture balance
In a project, you would go to Components > Low Impact Development Controls. This is where you would enter the different LID Controls for the project. After these are set up, you can export them to the Engineering Libraries for use in other projects.
Note: The underdrain is only required on a rain barrel control. If using a rain barrel, you will notice that it has a Drain Delay. The drain delay is the number of dry weather hours that must elapse before the drain line in a rain barrel is opened (the line is assumed to be closed once rainfall begins).
After entering the Low Impact Development (LID) Controls, you will add the catchments and LID elements to the network.
Note:
Low Impact Development Element Properties
Urban Street Stormwater Guide