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GI Drain.jpgMCM-5 Post Construction Storm Water Management



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Post construction storm water management in areas undergoing new development or redevelopment is necessary because runoff from these areas has been shown to significantly affect receiving water bodies. The goal of post construction storm water management is to reduce the potential discharge of pollutants and control site runoff volumes and velocities. This can be achieved through proper design, installation, inspection and maintenance of various types of structural and non-structural best management practices (BMPs). Fort Hood uses the following mechanisms to ensure that post construction storm water management techniques are employed in new development and redevelopment.

Energy Independence and Security Act of 2007

The Energy Independence and Security Act of 2007, Title IV, Subtitle C, Section 438 states that the sponsor of any development or redevelopment project involving a Federal facility with a footprint that exceeds 5,000 square feet shall use site planning, design, construction, and maintenance strategies for the property to maintain or restore, to the maximum extent technically feasible, the pre-development hydrology of the property with regard to the temperature, rate, volume, and duration of flow. Click on the highlighted lettering for a copy of the Energy Independence and Security Act of 2007.

Low Impact Development (LID)/Smart Growth Techniques

LID comprises a set of site design approaches and small-scale storm water management practices that are intended to reduce runoff and associated pollutants from the site at which they are generated. By means of infiltration, evapotranspiration, and reuse of rainwater, LID techniques manage water and water pollutants at the source and thereby prevent or reduce the impact of development on rivers, streams, lakes, coastal waters, and ground water. The management practices associated with LID include some of the following:
  • Infiltration of rain water through vegetated trenches and basins with some infiltration devices
  • caping methods that include rain gardens, bioretention cells or bioswales, and native vegetation
  • Stormwater conveyance through vegetated channels such as bioswales and directing runoff from impervious areas to vegetated areas
  • On-site capture and storage of rainwater using rain barrels or subsurface storage
  • Minimization of impervious areas by using green roofs, narrower streets, porous pavers, and landscaped traffic-calming areas
Rain Gardens are a shallow depressional area planted with native vegetation that absorbs and infiltrates runoff from impervious surfaces and may discharge to groundwater, a storm drain, or a surface outlet. Rain gardens reduce the volume of storm water runoff pollutant loads delivered to surface water and help reduce the quantity and velocity of surface runoff from a site.

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Bioretention Cells are designed to function similar to rain gardens except that they collect larger volumes of runoff generated at sites with a high percent of impervious surfaces. They are often used in industrial settings, corporate campuses, shopping centers, or other sites with large parking facilities. The cells are designed with more temporary storage to accommodate larger volumes of runoff and consequently will have more depth compares to a typical rain garden.

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Bioswales are vegetated swales that intercept or receive impervious surface runoff and blend infiltration and slow conveyance of storm water. These systems can be engineered to absorb the high frequency low intensity storms but can also convey large storm events while providing vegetative filtering. Bioswales can discharge to groundwater, storm sewer intakes, or directly to a surface water body.

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For more information on Post Construction Storm Water Management, please click the following links.
Post-Construction Stormwater Management in New Development and Redevelopment
2006 Design Manual for Site Development

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