What isawatershed? Why isit important? • A watershed orcatchment orbasinordrainagearearefersto any topographically delineatedareathat cancollectwater andisdrained byariversystemwith anoutlet (Brooks,etal.,1981).Itincludesall landareasextending fromthe ridgedown to the streamforwhich water iscollected (Figure1). • Watershed isnot necessarily anupland or a mountainous land form. There isan upland watershed, a lowland watershed, an Rex Victor O.Cruz* _S