For many communities, future increments of supply will be very costly. The value of a conserved amount of water at a future point in time will be equivalent to the most costly supply option available at that future time point, because that is the supply option being displaced by conservation. Detailed cost estimates may be available from facility plans or other planning documents. Planners should consider all capital facility improvements and additions. Improvements include renovations and expansions needed to maintain or enhance safety or reliability within existing facilities.
Additions consist of new facilities.
Routine maintenance improvements should not be included. Anticipated water purchases and costs also should be recorded on Worksheet 4-5 . For this part of the analysis, the effects of conservation measures currently being implemented should be considered, but the effects of new conservation measures on the need for supply capacity or water purchases should be excluded. Water purchases are separately recorded. Conservation can be particularly beneficial for systems that have a sufficient planning horizon to integrate conservation with conventional resource options.