Underground Rainwater Tanks

Rainwater harvesting (RWH) captures, diverts and stores rainwater for later use. With proper planning and design, your system can be built to capture up to 100% of the surface area rainwater. Flowtite fiberglass tanks can store wastewater, graywater, rainwater, stormwater, even potable drinking water. The tanks can also be fit with filtering components to separate oil and other contaminants so the rain collected can be reused for landscaping and other applications.

Recent Project: 200,000 gallon system in New York

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For more details on the project CLICK HERE

Calculating how much water you need to store depends upon several factors like annual rainfall, typical usage totals and specific intent for collected water. For instanceyou could simply reuse rainwater for a small garden, or to irrigate landscaping or even as an alternative plumbing water supply for toilet flushing. For an in depth study you should consult a professional system designer but for a simple calculation you can use the following guideline:

During a one inch rain, approximately 620 gallons of water can be collected for every 1,000 sq. ft. of surface area. That means an average house roof will collect over 1,000 gallons for every inch of rainfall. Commercial buildings will often have flat open roofs perfect for collecting rainwater and although rainwater cannot be used for every potable water application, the majority of potable water usage can be offset using recycled rainwater.


Rainwater harvesting can make a dramatic impact through financial tax incentives, compliance with current and future regulations and additional credits toward certification of “green” building.

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