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Florida Lake Management Society Annual Conference, Naples, Florida, June 4 – 7, 2007

EVALUATION OF STORMWATER REUSE ON A TYPICAL SINGLE FAMILY RESIDENTIAL PARCEL

Jeffrey L. Herr, P.E., D.WRE PBS&J West Palm Beach, FL

Pollutant loadings from developed land are much higher than undeveloped land due to increased runoff volumes and the addition of anthropogenic pollutant sources such as fertilizers. Based on a study completed in the Leon County area of Florida (Harper, Herr and Baker 2000), pollutant loadings typically increase by more than one order of magnitude following development. Estimated pollutant removal efficiencies for typical stormwater treatment systems currently used in Florida remove 25-40% of the total nitrogen load, 30-70% of the total phosphorus load, 75-95% of the total suspended solids load and 25-60% of the biochemical oxygen demand. If pollutant loadings following development are an order of magnitude greater than pre-development loadings and currently used stormwater treatment systems remove only a fraction of the pollutants, additional pollutant loads are being discharged to our receiving waters every day. In addition, potable water supply sources are rapidly being depleted. Stormwater runoff should be considered a resource for alternate water supply and should not be lost to tide.

Low impact development (LID) is a method to reduce the impact of development on the environment. LID encompasses many elements and has many benefits. This presentation will consider the requirements and benefits of collecting, storing and reusing stormwater runoff from a typical single family residential lot contained within a typical curb and gutter residential subdivision. All storm water runoff for common rain events (<2-3 inches) from the lot and adjacent street will be collected and stored on-site and reused for irrigation, toilet flushing, and other water uses requiring a lesser water quality. The implementation of this concept would significantly reduce pollutant loads to the stormwater treatment system and downstream receiving waters and would significantly reduce the potable water use requirements for the home.

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NOTES

Session 5B – Page 7

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