Roof catchment
|
Diagram by Erik Nissen Peterson.
When heavy rainfalls occur over a short time period, the run-off can be quite high. If the ground level catchment areas are well sloped and hard surfaced, as much as 3/4 of the annual rainfall may be collected. Where there is little slope and a permeable surface, however, only about 1/4 of the rainfall can be saved. To compensate for a gentle slope, a soft surface, or the need for additional water, the catchment area can be extended or covered with a hard surface material.
|
From: Farm Structures in Tropical Climates http://www.fao.org/inpho/vlibrary/s1250e/s1250e00.htm.
Edited by Lennart P. Bengtsson and James H. Whitaker, FAO copyright 2000.
|
| |
|
|
