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Q. How much water pours off your rooftop each year?
|a. 100 gallons
||b. 2,000 gallons|
|c. 6,000 gallons
||d. 10,000 gallons|
A. A house with a 1000-square-foot rooftop can collect 6000 gallons of waer during a year with 10 inches of rainfall..
Hard surfaces of rooftops double as "catchment surfaces," collecting and directing rain with rain gutters and downspouts to water plants. Rainwater provides plants with a healthy drink of low-salt, nutrient-rich water.
Create natural looking depressions, called swales, near root systems. These shallow basins slow the flow of rainwater, allowing it to soak into the soil.