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<br />t-- <br />C.: <br />lot') <br /> <br />,- <br />- <br /> <br />Historic stream inflows and forecasted inflows for both Gurley and Cone Reservoirs were used <br /> <br />as water supply input to the model. Historic streamflows were used to evaluate the long-term <br /> <br /> <br />capabilities of the system while forecasted inflows were used to evaluate water supply <br /> <br />conditions for the upcoming season. Information gathered during irrigator interviews, <br /> <br />conducted in September 1989 in Norwood, was used to develop irrigated acreage, crop type, <br /> <br /> <br />irrigation method, and share ownership input data for each of 151 unique land parcels in the <br /> <br /> <br />service area. Acreages, crop type, and irrigation methods data were used to develop irrigation <br /> <br /> <br />water demands. Soils data were developed from SCS soils maps and soil surveys. Plate 1 <br /> <br /> <br />shows a map of the service area with the Gurley and Cone system facilities identified and with <br /> <br /> <br />land parcels delineated and numbered. <br /> <br />The following is a description of the steps used in the operation model for each monthly time <br /> <br /> <br />step. Figure 2 shows a flow diagram of the major steps used in the model. Stream inflows are <br /> <br />read into the model and distributed to shareholders based on each shareowner's percentage of <br /> <br />total ditch company shares. Net crop consumptive use for each parcel is read and the at- <br /> <br /> <br />reservoir crop demands computed by the following relationship: <br /> <br />COres = L.Q CUned1.O - .30 (1.0-eft)) ffil (1.12) <br />eff 12 <br /> <br />WHERE: <br /> <br />COres <br /> <br />= <br /> <br />at-reservoir crop demands in acre-feet <br /> <br />CUnet <br /> <br />= <br /> <br />net crop consumptive use in inches for the parcel <br /> <br />eff <br /> <br />= <br /> <br />irrigation method efficiency <br />(flood = 0.45; sprinkler = 0.70) <br /> <br />A <br /> <br />= <br /> <br />irrigated acreage of the parcel <br /> <br />8 <br />