Supply options: (1) Dam and reservoirs Benefits: equalization and control of stream flow, power generation, flood and drought control. recreation Problems: silting up of reservoirs over time, great evaporation losses (2) Large-scale water diversions Benefit: supplying abundant water for regional development Problems: high cost, evaporative loses, salt buildup and soil deteriorationSupply options: Supply options: (1) Dam and reservoirs (1) Dam and reservoirs ¾ Benefits: equalization and control of stream flow, power generation, flood and drought control, recreation ¾ Problems: silting up of reservoirs over time, great evaporation losses (2) Large (2) Large -scale water diversions scale water diversions ¾ Benefit: supplying abundant water for regional development ¾ Problems: high cost, evaporative loses, salt buildup and soil deterioration