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Wet ponds should be designed to capture and treat the remaining Treatment Volume (Tv) for the water quality design storm and the channel protection volume (if needed) discharged from the upstream runoff reduction practices, using the accepted local or state calculation methods.
volume reduction is now an important, and in some cases necessary, strategy to achieve the required pollutant load reductions. Runoff volume reduction is also linked with revised channel and flood protection criteria in the VSMP regulations. There is still a need to model the peak discharge and hydrologic and hydraulic response
Treatment Volume (Tv) above the permanent pool or a multiple cell design in order to improve performance and meet the Level 2 performance goal. Wet ponds can also help to meet channel protection requirements by utilizing detention storage above the permanent pool and extended detention storage volumes to reduce peak flows from the
An Extended Detention (ED) Pond relies on 12 to 24 hour detention of stormwater runoff after each rain event. An under-sized outlet structure restricts stormwater flow so it backs up and is stored within the basin.
Figure 1. Output from the DCR Compliance Spreadsheet. NOTE: The Runoff Reduction Method (RRM) spreadsheet computes the required treatment volume for a site, and analyzes the type and design levels of stormwater practices that are needed to comply with runoff and nutrient reduction targets.
Use our pond volume calculator to work out the surface area, volume, liner size and minimum recommended pump size for your pond in a variety of units. Calculators All
Chapter 6 of the 2013 Virginia Stormwater Management Handbook (2nd Edition) provides a more thorough discussion of the site planning process and design considerations as related to Environmental Site Design and potential LEED credits.
