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*Will there be limitations to vegetation established due to water level bounce and drawdown? | *Will there be limitations to vegetation established due to water level bounce and drawdown? | ||
*Consider the potential for erosion from inlets and sideslopes under low pond water levels. | *Consider the potential for erosion from inlets and sideslopes under low pond water levels. | ||
− | *To discourage the growth of algae and other microorganisms, ponds should be sized such that detention times are not excessive during warm weather. As temperatures increase, the recommended maximum detention time decreases (Met Council, 2011). This is not likely to be a concern for reuse ponds since detention times are typically short. The following table is from the [https://metrocouncil.org/Wastewater-Water/Planning/Water-Supply-Planning/Studies-Projects-Workgroups-%281%29/Completed-Studies-Projects/Stormwater-Reuse-Guide.aspx Met Council Reuse Guide] ''Storage Systems Toolbox I.2'', originally adapted from New South Wales Department of Environment and Conservation, [ | + | *To discourage the growth of algae and other microorganisms, ponds should be sized such that detention times are not excessive during warm weather. As temperatures increase, the recommended maximum detention time decreases (Met Council, 2011). This is not likely to be a concern for reuse ponds since detention times are typically short. The following table is from the [https://metrocouncil.org/Wastewater-Water/Planning/Water-Supply-Planning/Studies-Projects-Workgroups-%281%29/Completed-Studies-Projects/Stormwater-Reuse-Guide.aspx Met Council Reuse Guide] ''Storage Systems Toolbox I.2'', originally adapted from New South Wales Department of Environment and Conservation, [https://www.environment.nsw.gov.au/-/media/OEH/Corporate-Site/Documents/Water/Water-quality/managing-urban-stormwater-harvesting-reuse-060137.pdf Managing Urban Stormwater, Harvesting and Reuse], April 2006: |
{{:Maximum Detention Time - Average Daily Temperature}} | {{:Maximum Detention Time - Average Daily Temperature}} | ||
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*[[Requirements, recommendations and information for using stormwater pond as a BMP in the MIDS calculator]] | *[[Requirements, recommendations and information for using stormwater pond as a BMP in the MIDS calculator]] | ||
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<noinclude> | <noinclude> | ||
[[Category:Level 3 - Best management practices/Nonstructural practices/Harvest and reuse]] | [[Category:Level 3 - Best management practices/Nonstructural practices/Harvest and reuse]] | ||
+ | [[Category:Level 3 - Best management practices/Specifications and details/Design criteria]] | ||
+ | [[Category:Level 3 - Best management practices/Structural practices/Wet pond]] | ||
</noinclude> | </noinclude> |
Stormwater ponds can be used as the storage component of a stormwater harvest and use system. These ponds are multi-purpose, providing stormwater retention, sedimentation, and storage for later use. In this way, stormwater harvest and use systems can be part of a treatment train approach for stormwater management. Existing ponds can be retrofitted to serve as a water source for a harvest and use system.
If the pond is designed to meet the Construction Stormwater General Permit, several requirements must be met. Those are summarized here.
The first question to ask before selecting a constructed stormwater pond as the BMP is whether a pond is the most appropriate BMP. If the goal is to meet a volume retention requirement and the retention requirement can be met through infiltration of stormwater, then stormwater infiltration practices should be considered. On soils conducive to infiltration and where site constraints do not exist, infiltration will typically be the most appropriate BMP. However, if site goals include other factors, such as replacing a water supply or irrigation of vegetation, harvest and use is an appropriate BMP.
Ponds should be designed following guidance in pond design guidance section of this manual. However, there are or may be specific design considerations for stormwater ponds used in harvest and use/reuse systems. These design considerations are summarized below.
Below is a list of additional considerations that are not specifically addressed above.
Maximum Detention Time - Average Daily Temperature
Link to this table
Maximum Detention Time (days) to limit algae blooms: | Average Daily Temperature (F) |
---|---|
50 | 59 |
30 | 68 |
20 | 77 |
This page was last edited on 29 December 2022, at 17:04.