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Downspouts convey water from the gutters to storage. 

They should provide 1 square inch of opening for every 100 square feet of roof area. The maximum run of gutter for one downspout is 50 feet.

A good downspout is  Schedule 40 PVC (or comparable) in a 4-inch diameter. 

Other items of importance:

• Use one- or two-way cleanouts in any horizontal pipe run exceeding 100 feet. 

• Do not exceed 45-degree angle bends in horizontal pipe runs.

• Provide 1/4-inch slope per lineal foot minimum.

Back to Rainwater Harvesting Index. 

For further information about Renewable Water and Renewable Energy in this area of Texas contact

Terry Jensen
972 251-1532 or 817 545-0140
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