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MWSI Project Phase" Conjunctive Use Summary Report - DRAFT August 22, 1995 APPENDIX B: CONJUNCTIVE USE MODEL General Description For illustrative and exploratory pwposes, a model of an example conjunctive use system was prepared using the spreadsheet application Microsoft Excel 5,0, The model, as developed, is described in schematic form in Figure 5 (Schematic of Model), which shows the components of the modeled system and their interrelationships, Following through the schematic, surface water supplies arc assumed deliverable at the Strontia Springs Reservoir. These raw water flows are then deliverable to DW's Foothills Water Treatment Plant ("Foothills") and from there are available to meet water system demands ofDW and its distributors, All water supplies at Strontia Springs are also deliverable to a local peaking reservoir ("conjunctive use reservoir") which is assumed to located in proximity to the area of conjunctive use qemands, From the conjunctive use reservoir, supplies are deliverable to a local water treatment plant and are then directly distributed to meet conjunctive use demands, In the event that raw water supplies are not available from surface water sources, a system of groundwater wells would be operated to deliver groundwater to the local treatment plant or to the conjunctive use reservoir. In either case, these supplies would be treated at the local plant and then would be delivered to meet conjunctive use demands or can be delivered directly to payback for borrowing surface water supplies. In addition, when unused supplies are available in the surface system, these supplies are delivered to the conjunctive use reservoir, are then treated at the same local treatment plant, and can be delivered to the same groundwater well field for recharge into the aquifer system, These various interconnections are shown on Figure 5. Description of Model Input The input to the conjunctive use model includes the following: . Monthly surface water supply volumes, . Annual conjunctive use demand volume. . Conjunctive use demand distribution by month, Surface water payback time period, . Maximum borrow volume from the surface water system. Groundwater pumping rate. . Annual groundwater recharge volume. . Conjunctive use reservoir volume. 48