Local Knowledge About Catchment

A catchment is an area from which runoff is collected. Tile, slate, wood, galvanized steel and aluminum roofs are the most suitable catchments, although conventional shingled roofing can be used with provisions to filter out debris. Patios and driveways are also sometimes used as catchment surfaces. Rough surfaced materials collect dirt and debris that affect the quality of the water collected. Gutters and downspouts should be easy to clean and inspect. Rainwater picks up dust, soot, bird droppings, leaves and other foreign materials that add objectionable organisms, color and odor to the water. Do not collect water under overhanging trees. Gutter guards and "roof washers" can improve the quality of the collected water.