Rainwater Harvesting

Underground Water Collection System

Fiberglass Tanks
Engineering Assistance

Rain Harvesting - Bypass Overflow

Rain Harvesting - Bypass Overflow
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Rain Harvesting System

Rain Harvesting System
Click to enlarge

RAIN HARVESTING or RAIN CAPTURE is becoming increasingly popular for landscape irrigation due in part to recent improvements in drip irrigation technology.  Darco manufactures underground fiberglass rain water storage tanks.

A one inch rain on a 2000 square foot roof generates over 1000 gallons of free water. Arid western states such as New Mexico and Arizona support and promote Rain Harvesting and Drip Irrigation which returns moisture to the soil at slow absorbable rates with minimal evaporative loss.

Always design your storage system with a high volume cap to divert excess rain water that can not be stored fast enough during a downpour. Also consider a tank cap to release any excess water when the storage system is completely full. Both the bypass and overflow must be directed away from the tank and discharged where it will not cause erosion or lead to structural building damage. (See Illustration #1)

We do not recommend that you drink or bathe in rainwater unless it has been treated to your local Health Department standards. Rainwater should rightfully be used in a way that returns the moisture to the earth near the location where it fell, such as through outside landscape irrigation or a septic system leach field.

Roof water generally carries leaves, dust, bugs, bird excrement, and a variety of other undesirable elements into any rain capture storage system. Screening or filtering the water before it fills the storage tank is desirable provided the filter has the capacity to process the rain as fast as it falls. This may be difficult to do in the case of a "cloud burst".  A high volume bypass should be designed into any rain water collection system for such event.

Illustration #2 depicts our rain capture system with a simple inlet basket screen and an upstream bypass.

A shallow upstream concrete silt interceptor will greatly reduce the amount of sludge collected in the bottom of the primary storage tank. Accumulated silt in the bottom must be removed every few years by vacuum truck.

Project Showcase

Rainwater Harvesting picture

Donahoo Construction Company (Alabama): Landscape irrigation around new library using rainwater collection system with underground fiberglass tank / 8,000 gallons

Flintco (Arkansas): Rain capture storage and melt water for ice rink / 6,000 gallons

Chub Cay / Residential Rain Harvesting (Bahamas): Fresh water from rain water capture for individual homes / 8000 gallons

Nick Fisher Excavating (Connecticut): Fiberglass storage tank for rain harvesting for landscaping / 8,000 gallon cistern tank

Lafayette Recreation Center (DC - Washington): Landscape irrigation from rainwater harvesting / 8,000 gallons

Keene Project Management (Georgia): Landscape irrigation cistern tank / 16,000 gallons

Kaylo School (Hawaii): Underground fiberglass water storage for landscape irrigation / 10,000 gallons

Kiowa County Memorial Hospital (Kansas): Underground storage tank for landscape drip irrigation / 4 - 6,000 gallons cistern tanks

Greensburg High School (Kansas): Landscape irrigation rainwater recycling fiberglass storage tank / 50,000 gallons

LaGrange Library (Kentucky): Rainwater underground fiberglass storage tank for toilet flushing / 12,000 gallons

Bellarmine University (Kentucky): Landscape irrigation rainwater harvesting system using fiberglass underground tank / 12,000 gallons

Pillingsrud Residence (Minnesota): Underground fiberglass storage tank rainwater backup for irrigation / 4,000 gallons

Sayreville Center (New Jersey): Underground fiberglass storage tanks for commercial landscape irrigation from rainwater harvesting / 35,000 gallons

Sub-Surface Contracting (New Mexico): Rain capture systems for landscape irrigation / sizes 4,000 to 10,000 gallon cistern tanks

Bronx Community College (New York): Fiberglass underground cistern for rain harvesting for irrigation / 40,000 gallons

Bethany Village (North Carolina): Irrigation and toilet flushing from fiberglass rain storage tank / 30,000 gallons

Quail Crossing General Store (North Carolina): Underground fiberglass tank for rain water capture for irrigation and toilet flushing / 30,000 gallons

The Elephant Sanctuary (Tennessee): Fiberglass underground tank for rain water collection for elephant habitat / 40,000 gallons

Birnamwood Elementary School (Texas): Rain harvesting underground fiberglass storage tank for irrigation / 20,000 gallons

Bank of America (Texas): Rain harvesting for irrigation / 20,000 gallons

Ferring Residence (Virginia): Residential rainwater capture system used for irrigation and fire protection / 8,000 gallons

Laramie County Community College (Wyoming): Underground fiberglass tank for rain capture for landscape irrigation on the campus grounds / 40,000 gallons

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