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<br />001907 <br /> <br />Historic Diversions and Reservoir Data <br /> <br />Monthly historic diversions were obtained electronically for years 1974 to 1993 for all diversions in <br />Colorado. Natural flow equations requires the volume of water that crosses natural flows boundaries, <br />therefore, only those diversions involved in export, import, or gage bypass were used. Only those <br />diversions with a water rights greater than 5 cfs were used. Published 1970 to 1974 records were <br />manually appended to the 1974 to 1993 data. <br /> <br />NIIP diversions were obtained from operating personnel. Other New Mexico diversions were <br />estimated by taking the minimum of [(diversion capacity) or (depletion divided by diversion <br />efficiency)]. <br /> <br />Reservoir releases, storage, and evaporation data were obtained from Reclamation operating personnel <br />for Jackson Gulch, Vallecito, Lemon, and Navajo reservoirs. Reservoir releases and storage data <br />were obtained from Colorado for Cascade Reservoir. Evaporation data were estimated for Cascade <br />Reservoir by using Lemon Reservoir evaporation rates. Historic reservoir data are tabulated in <br />Appendix C. <br /> <br />Natural Flow Estimation for 1970 to 1993 <br /> <br />The natural flows were computed by gages and hence depletions were distributed by gages. For <br />reference only the method used to proportion depletions used in the natural flow study are presented <br />as follows: <br /> <br />Non Irrigation Depletion = <br /> <br />mmrbfT of HUC. <br />L GagePercentage(i) * <br />;=1 <br /> <br />rrumber of Categories <br />L HUCDepletions(j) <br />}=1 <br /> <br />where Gagepercentage is percent of HUC within gage's basin boundary. <br /> <br />Irrigation Depletion = <br /> <br />numb.,. of Umt& <br />L GagePercentage(i) *[ Acres(i) * Rate(i) * [1.0 + incidentalLossRate] + SprinklerEvap(i)] <br />;=1 <br /> <br />where Gagepercentage is percent of Unit within gage's basin boundary. Incidental <br />loss rate is a function of county. <br /> <br />DRAFT - SJRIP Hydrology Model Documentation <br />June 18, 1999 <br /> <br />28 <br />