Catchment: The rainwater collection area is any paved or unpaved surface, such as rooftop, plot (garden, driveway etc). Catchments for recharge need not be “super clean” – since the water is getting recharged and the earth acts as a filter as it percolates into the ground. Therefore, garden areas, paved areas, farmland and rooftops are appropriate catchments. Catchments with chemical contamination however should be avoided. Gardens and farmlands should be conscious about the use of fertilizers and pesticides.
Conveyance: In the case of rooftops, downpipes or gutters carry rainwater. In the case of plots, channels/pipes in the ground carry water. In layouts / campuses / large apartments storm water drains carry runoff from different catchments of the landuse (Eg: parks, roads, other paved areas, gardens and excess rooftop runoffs). Storm water drains therefore are a very important conveyance mechanism for recharge.