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<br />0J1973 <br /> <br />1. San Juan River between Archuleta and Farmington. (ALPArchuletaToFarmington) <br />2. San Juan River between Farmington and the confluence with the La Plata River. <br />(ALPFarmingtonToLaPlata) <br />3. San Juan River between the confluence with the La Plata River and Shiprock. <br />ALPLaPlataToShiprock) <br />4. Animas River at Farmington (ALP Animas) <br />5. La Plata River near Farmington. (ALPLaPlata) <br />6. Mancos River at Towaoc, Effected by Full ALP only. (ALPMancos) <br /> <br />The initial step in the ALP affected tributary disaggregation process is to sum the daily ALP <br />depletions (positive and negative) into monthly values. These monthly values are then subtracted <br />from the San Juan Model monthly tributary estimates for the affected tributaries. The remaining flow <br />is disaggregated into daily flows as a daily fraction of the monthly gauged flow (ratio method). <br /> <br />1. If the monthly gauged flow equals zero, then the ALP adjusted model monthly flows <br />(monthly model tributary flow less ALP correction) are uniformly distributed across all <br />days of the month. <br /> <br />2. If any negative flows occurred after disaggregating monthly model tributary flows into <br />daily flows. then the Model monthly flows are uniformly distributed across all days of the <br />month without the ALP correction. <br /> <br />After the daily disaggregation of the ALP corrected monthly flows was completed, the daily ALP <br />depletions were added back in. The daily values are formatted for spreadsheet input and then used in <br />the daily flow balance. <br /> <br />Detailed Descriotion of Dailv Natural Flow Balance <br /> <br />This Appendix describes in more detail the steps and methods used in creating the daily natural flow <br />balance. The daily natural flow balance is created by using the daily gage flows to disaggregate the <br />monthly natural flows into daily values. The procedures used are outlined below as follows: <br /> <br />1. Fill in missing monthly gage records: Few gages have complete records starting in <br />October 1928. The gauging stations included in the daily disaggregation and the periods <br />of record available are shown Table 2-7. <br /> <br />The missing monthly gaged flows are calculated with the same method used for the natural <br />flow extension. For each station with missing monthly records, a key station spanning the <br />complete periOd was chosen for the disaggregation. The stations with their key station in the <br />calculation sequence are: <br /> <br />. San Juan at Archuleta (Blanco), October 1928 to September 1930 with Animas at <br />Durango as key station. <br />. Animas at Farmington, October 1928 to September 1930 with Animas at Durango as <br />key station. <br />. La Plata near Farmington, October 1928 to March 1938 with La Plata at Hesperus as <br />key station. <br /> <br />DRAFT - SJRIP Hydrology Model Documentation <br />June 18, 1999 <br /> <br />34 <br />