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Subtask 7 - Demand Time Series Data Management Interface (DMI) Utility <br />For the MODSIM model, diversion demands at irrigation structures modeled in the network (including <br />aggregated water rights) are estimated using (a) irri gated acreage served by that structure, (b) monthly <br />estimates of net consumptive use (net evapotranspiration), and (c) estimates of monthly system efficiencies. <br /> For the Gunnison River prototype model, the dema nd time series for each structure was created using <br />software developed by RTi to utilize data from the input files for the GUNMOD model, specifically the <br />SEASONAL.TXT file (unit monthly rates for net consump tive use) and the CRAM.OUT file, including (1) <br />the structure name, (2) the ID for the consumptive use table relevant to that structure, (3) the irrigated <br />acreage, and (4) the system efficiencies. The RTi so ftware then is used to compute the demand at the <br />structure by multiplying the acreage times the appropria te consumptive use times series dividing by the <br />system efficiency for that structure. <br />Based on the results of meetings with water users, some of the irrigated acreage values in the GUNMOD <br />CRAM.OUT files were modified to better represent curre nt conditions. The revised acreages were obtained <br />from the geographic information system (GIS) mappi ng provided by the USBR and State and plotted by the <br />CRDSS consumptive use group. The sp ecific changes are as follows: <br />D e s c r i p t i o n o f D e m a n d ( G U N M O D ) G U N M O D A C R E S M O D S I M A C R E S <br />GunMainstBtwUnc&NF10,9464,307 <br />UpperCimarronR 1,9661,232 <br />LowerCimarronR 2,5341,766 <br />CimarronCanal 5,4217,391 <br />The following GUNMOD demand nodes (and irrigated acreage values) were modified for the MODSIM <br />prototype to more closely replicat e actual conditions, based on interviews with water users and the GIS <br />mapping of irrigated acreage. <br />G U N M O D <br />SmFrkAboveFeeder 266 <br />SmithFrkBtwIronCr&Feeder/AspenCanal 8,782 <br />UpperSmithFork 35 <br />LwrSmithForkDivision 3,300 <br />M O D S I M <br />Upper Smith Fork Project Ditches3,630 <br />Lower Smith Fork Project Ditches3,598 <br />Grandview Canal3,164 <br />Lower Smith Fork Non-Project Ditches 505 <br />Fruitland System8,141 <br />Cattlemen's Ditch2,965 <br />Dyers Fork Ditch 642 <br />For future CRDSS applications, a DMI utility was de veloped to calculate the demand time series for <br />modeled structures following the same basic proce dure but with data accessed from the CRDSS database. <br />This demand time series DMI is described in Task Memorandum 1.15-14, Demand Time Series DMI <br />Utility. <br />5 <br />A 275 .01.09.95 1.15-26 Fosha <br />