Rainwater Harvesting

Underground Water Collection System


Fiberglass Tanks
PolyethyleneTanks
Engineering Assistance

Rain Harvesting - Bypass Overflow

Rain Harvesting - Bypass Overflow
Click to enlarge

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 both fiberglass and polyethylene underground 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 bypass to divert excess rain water that can not be stored fast enough during a downpour. Also consider a tank overflow 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. 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" event.

The second illustration depicts our Modular OcTank Rain Capture System with a simple filtration and clarifier module which includes an upstream bypass, strainer basket, and high capacity washable fabric filter.

Any clarifier or concrete interceptor tank will require some maintenance. 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 / 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): 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 landscape irrigation (Hawaii): Ship on low cost Flat Racks / 10,000 gallons

Kiowa County Memorial Hospital (Kansas): Landscape drip irrigation / 4 - 6,000 gallons cistern tanks

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

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

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

Pillingsrud Residence (Minnesota): Rainwater backup for irrigation / 4,000 gallons

Sayreville Center (New Jersey): 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): Rain harvesting for irrigation / 40,000 gallons

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

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

The Elephant Sanctuary (Tennessee): Rain water collection for elephant habitat / 40,000 gallons

Birnamwood Elementary School (Texas): Rain harvesting 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): Rain capture for landscape irrigation on the campus grounds / 40,000 gallons


Darco Incorporated || 980 Darco Drive || P.O. Box 779
Bennett, CO 80102 || (800) 232-8660
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