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<br />.' <br /> <br />/., 00062,7 <br /> <br />18,000 acre-feet/month) and the demand has been assigned a link cost of -17500 which is <br />equivalent to a Priority Class 4 water right, This priority would be slightly senior to the water <br />rights for the Redlands Power Canal, <br /> <br />2,2 Instream Flow for the Black Canyon of the Gunnison <br /> <br />The second scenario assumes implementation of a reserved right for enhancement of the flows <br />through the Black Canyon of the Gunnison, For this demonstration, the demand is assumed to be <br />at a year round rate of 600 cfs (approximately 36,000 acre-feet/month) and that the demand <br />would be assigned a relatively senior priority with a State Engineer Administration Number of <br />30450,0000, This priority would be senior to many of the major upstream water rights, including <br />the water rights of the Aspinall Unit reservoirs and Taylor Park Reservoir, <br /> <br />2.3 Assessment of the Impacts of a New Instream Flow Right <br /> <br />The impact to existing water rights resulting from the addition of a new instream flow right is <br />assessed by comparing the results of a model run for a baseline condition on the river system with <br />the results of a model run which incorporates the new instream flow demand, A utility (simdiv) <br />was developed to create an output file (modsim OUT file name,msdl which lists every demand in <br />the network, its node number and the diversion to those demands for each time step of the <br />baseline and the in stream flow model runs, A unix script (difmsdl is then run which compares the <br />two output files and generates a report (difmsd, out) showing the differences between the two <br />output files, The difference file lists each demand that received a different volume of water <br />between the two simulations, The file lists the demand, the corresponding . ,msd file and the <br />diversion amount for each time step for the entire selected study period for each model data set, <br />For purposes of this task memo, the baseline simulation is represented by the file ca/3, 6 data set. <br />For the Redlands Power Canal scenario, the simulation is represented by the file redfish data set., <br />The Black Canyon scenario is represented by the file b/c600 data set, <br /> <br />Examples of the full diversion output files produced by simdiv and the difference file produced by <br />difmsd for the two scenarios are attached to this memorandum. These files can readily be used <br />to evaluate which water rights would be impacted by the imposition of a new instream flow right <br />and to what extent, Man-pages describing the utilities simdivand difmsd are included in the on- <br />line documentation, <br /> <br />3,0 CONCLUSIONS <br /> <br />The prototype Water Rights Planning Model is designed to enable the user to readily evaluate the <br />impacts of alternative scenarios of water rights development upon existing water rights and <br />reservoirs, Using the MODSIM interface, the user can interactively generate new demands, such <br />as an instream flow requirement. by creating a new demand node with an associated rate of flow <br />and priority date. Utilities have been developed to enable the user to easily evaluate the magnitude <br />of any resulting impacts on other water rights in the stream system network. <br /> <br />Examples are provided of two scenarios in which new instream flow demands are imposed upon <br />the stream system, one involving an instream flow requirement at the Redlands Power Canal and <br />the other a senior reserved water right for the Black Canyon of the Gunnison. <br /> <br />A276 01'27-96 <br /> <br />2 <br /> <br />1,16-29 Fosha. Ritsch <br />