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Results of baseflow model runs for the Rio Grande model indicate calculated negative flow <br />conditions at 10 of the 53 gages represented. For the most part, the calculated negative flow <br />values are relatively small and infrequent (less than 5 percent of the time and less than 20 cfs). <br />However, calculated negative flows are more frequent and more substantial at three of the <br />modeled gages (02356500, Alamosa River below Terrace, 08249000, Conejos Near LaSauces, <br />and 08243500, Trinchera Below Smith Reservoir). Negative baseflows calculated at the gage on <br />the Alamosa River are likely due to estimated end of month contents for Terrace Reservoir. <br />Discussions with Division 3 staff confirm that gages 08249000 and 08243500 periodically suffer <br />from backwater conditions and/or channel profile shift that can reduce accuracy of measurements. <br />FIGURE 1 <br />Rio Grande River <br />Average Monthly Baseflows <br />1950-1997 <br />350000 <br />300000 <br />250000 <br />R <br />~ 200000 <br />a~ <br />R <br />~ 150000 <br />V! <br />0 <br />100000 <br />50000 <br />0 <br />z m ~ ~ ~ z ~ U a ~ > U <br />~ ~ ~ ¢ ~ ~ ~ ¢ cW O Oz ~ <br />Month <br />FIGURE 2 <br />Conejos River <br />Average Monthly Baseflows <br />1950-1997 <br />100000 <br />80000 <br />R <br />~ 60000 <br />L <br />R <br />t <br />y 40000 <br />D <br />20000 <br />^Thirty Mile Bridge <br />^Wagon Wheel Gap <br />^ Del Norte <br />^ Monte Vista <br />^Alamosa <br />^Above Trinchera <br />^ Labatos <br />^ Below Platoro <br />^ Near Magote <br />^ Rio San Antonio <br />^ La Sauces <br />C:Acdss\Task8-8.doc Phase lc Model September 27, 2000 -Page 8 of 17 <br />0 <br />w ¢ a ¢ > > j w U O w <br />~ ~ ~ ¢ ~ ~ ~ ¢ ~ O Z D <br />Month <br />