The rationale for reservoirs
Reservoir construction should be avoided, if there is a better alternative. However, in many cases, reservoirs are the only practical alternative for sustaining public water supplies during a drought. Water system managers must understand the environmental impacts of a reservoir but environmentalists must appreciate the need for reliable water supplies for the public. Water supply planning must consider all alternatives and any non-structural alternatives must be realistic. Where reservoirs must be built, effective mitigation programs should be a condition of the reservoir permit.