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<br />CHANGE IN LAND OR WATER USE <br /> <br />1. Transition from pre-urban to <br />early urban <br /> <br />Remove vegetation <br /> <br />Scattered housing construc- <br />tion <br /> <br />Drilling wells <br />Add septic tanks <br /> <br />2. Transition from early urban <br />to middle urban <br /> <br />Bulldozing land for mass <br />housing <br /> <br />Mass housing construction <br />and street paving <br /> <br />Well abandonment <br /> <br />Streamflow diversion <br /> <br />Discharge poorly treated <br />sewage <br /> <br />J. Transition middle u~ban to late <br />urban <br /> <br />Additional housing, streets, <br />commerce ana industry <br /> <br />More untreated sewage <br />More well abandonment <br /> <br />Increased population, water <br />from other watersheds <br /> <br />Channels constricted <br /> <br />Construct sanitary drainage <br />and treatment plant <br /> <br />POSSIBLE HYDROLOGIC EFFECT <br /> <br />Decrease transpiration. <br />Increase storm flow sedimentation <br /> <br />Lower water table <br /> <br />Increase soil moisture, and <br />raise water table, some local <br />pollution <br /> <br />Increase storm flow sedimentation, <br />elimination of small streams <br /> <br />Decreased infiltration, increased <br />flood flows, lower ground water <br />levels <br /> <br />, Rise in \'later table <br /> <br />Decrease in streamflow <br /> <br />Increase stream pollution, fish <br />kills, inferior water quality <br />and recreation <br /> <br />Reduced infiltration, increased <br />flood flows, curbs and gutter, <br />lower base flow <br /> <br />Increased pollution <br /> <br />Rise in water table <br /> <br />Increased streamflow <br /> <br />Increased flood damage <br /> <br />Removal of water from area fur- <br />ther reducing infiltration and <br />recharge <br /> <br />9 <br />