Stormwater Management (Rainwater Harvesting)
Rainwater harvesting offers a small-scale best management practice to reduce stormwater runoff and the problems associated with it.
By harvesting the rainfall and storing it, you can slowly release the water back into the soil, either by irrigation or direct application. The water then moves into the groundwater table, providing a steady supply of water to local streams and rivers. Impervious surfaces such as driveways, sidewalks and streets block rainfall and other precipitation from infiltrating naturally into the ground, leading to even more stormwater and potential pollutant runoff.
3:54 minWatch the entire installation process of a 30,000 gallon modular, underground rainwater collection system. These modular units are constructed onsite, wrapped with layers of geotextile fabric and a impervious liner, and then covered. This system can be stacked up to 5 units tall which is 7.5'. We installed a submersible pump in the storage volume and connected it to a pump start relay controller so the pump will only turn on when the irrigation controller signals the pump start relay. This system is collecting from roughly 10,000 square feet of collection surface and has the capacity to collect about 200,000 gallons of rainwater per year.
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Frequently Asked Questions
How is rainwater harvesting used for stormwater management?
With the urbanization of the landscape the volumes of pavement great volumes of stormwater runoff occur during regular rain events. Stormwater capture and reuse through rainwater harvesting greatly reduces runoff roof shed and in some cases eliminate runoff altogether.
How do I calculate how much water I could capture during a storm?
The EPA has a comprehensive site with calculators available to determine your needs. https://www.epa.gov/water-research/national-stormwater-calculator
What size and shape of storage tanks are available?
Storage tanks are available for above grade and below grade use. Sizes range from just a few gallons, to rain barrels to larger 30,000 gallon tanks and everything in between. Shapes can be made to work with your lot sizes and dimensions for irregular needs as well.
What other components will I need?
Any good system will require inspection and cleanout ports to ensure proper function. You will also need pre filtration to keep organics and sediment out of the storage tanks. Geotextiles, clean sand or stone backfill. Float switches, pumps and control units and a city water switch over valve may also be needed for your configuration.
How can I use the water?
You can use the water to irrigate landscaping, for urinals, and toilets, agriculture, and more. Note, some areas require dye to be added prior to using for urinals and toilet flush.
Is it safe to drive over these systems?
Most systems can be incorporated into a comprehensive plan and achieve an H 20 load rating plus. (80,000 pound trucks). However, not all systems can be used in all applications.