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19 5 NM_Cerro_ 5 0.88 500 44 12 NM_ Cerro_11 0.25 1200 <br />20 5 CO_Cerro_ 5 1.45 500 45 12 CO_ Cerro_10 0.13 1200 <br />21 6 NM_Cerrito _1 0.38 600 46 13 NM_ PDA&P 4 2.75 1300 <br />22 6 NM_Cerro_ 6 2.82 600 47 13 NM_ PDM_3 0.15 1300 <br />23 6 CO_Cerro_ 6 1.78 600 48 13 NM_ T&A 3 0.33 1300 <br />24 7 NM_Cerro_ 7 3.06 700 49 13 CO_ Garcia_1 1.00 1300 <br />25 7 CO Cerro 7 1.91 700 <br />Split Channel Flows and Use of Carriers <br />Because the Rio Grande, Conejos River and Rio San Antonio have split channels they are modeled <br />within StateMod as carrier systems by the operating criteria file (rg.opr). The operational rights are <br />configured to allow diversions from the main channel to flow through a carrier structure and serve a <br />ditch located the split channel. The priorities of the operational rights are the same as the ditch rights <br />which they serve (additional information concerning operational water rights may be found in a <br />memorandum documenting development of the operating criteria file). The split channel carrier <br />structures represented in the Rio Grande model include SBRG-OUT (Rio Grande), NBCON-OUT <br />(Conejos River), and SBRSA-OUT (Rio San Antonio). <br />Return Flow Delay File <br />The Return Flow Delay (rg.dly) file describes the timing of return flows to the river system. This file <br />is created simultaneously with the Return Flow (rg.rtn) file, which provides the model information on <br />the location of return flows (information in the rg. rtn file is incorporated into the rg. dds file during its <br />creation by the DMI watright, while information in the rg.dly file is directly accessed by StateMod). <br />The lagged percentages provided in the rg.dly file represent the combination of surface and <br />subsurface returns. The rg.dly file is provided as Attachment 3. <br />For the Rio Grande surface water model, the timing of return flows was defined by applying Unit <br />Response Functions (URF's) developed using the San Luis Valley Groundwater Model. <br />Development of URF's is fully described in a memorandum by the Groundwater Contractor. URFs <br />generally consist of information on where and over what period water returns to a river after being <br />applied for irrigation at a specific location. URFs are therefore unique depending on location within <br />the San Luis Valley. These same URFs will be used in subsequent phases of model development to <br />represent depletive effects of well pumping on surface waters. <br />The rg. rtn file was developed through a GIS process that considered information on ditch service <br />areas relative to specific URF zones. A map of all delineated URF zones was superimposed on the <br />ditch service area map to allow assignment of the appropriate URFs to each diversion structure. <br />Historical Diversion File <br />The Historical Diversion (rg.ddh) file contains monthly historical diversions for each structure <br />modeled in the Rio Grande surface water model. Monthly historical diversions are used to estimate <br />baseflows at the stream gage locations and designated baseflow locations. <br />The rg.ddh file was developed using the DMI demandts run against HydroBase along with a series of <br />commands to set or replace certain aspects of the data (Attachment 4 contains the rg.ddh file with <br />the command files echoed at the top of this input file). Missing monthly values were filled using a <br />pattern filling technique whereby a stream flow gage is used to define a regional hydrologic <br />C:Acdss\Task6-7.doc Prepare Diversion Files September 22, 1999 -Page 5 of 6 <br />