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<br />O\l2~J'3 <br /> <br />The Service's HYDROSS model was then used to quantify the effects of the above <br />depletions on the Yampa River at Deerlodge Park. The model begins with gage <br />flows for the period 1930 to 1982 and subtracts depletions based on water <br />rights and availability. The results of the HYDROSS run were statistically <br />analyzed and are displayed in Attachment 2. <br /> <br />Several general trends can be identified by comparing Attachments 1 and 2. <br />The general trend is downward, with major reductions taking place in the peak <br />flow months, with smaller depletions in other months. There is also a trend <br />toward augmentation of flows from September through January of dryer years. <br />Table 2 displays these trends. <br /> <br /> TABLE 2 <br /> Yampa River at Deerlodge Park <br /> Historic Period Baseline Period <br />Percent exceedence 25% 50% 75% 25% 50% 75% <br /> April 4882 35B3 2278 4531 3139 1976 <br />Spring May 10484 9089 6189 9680 7856 5604 <br /> June 9316 7247 5143 8585 6198 4416 <br /> July 2295 1427 789 1908 1161 598 <br />Summer August 627 370 278 514 364 251 <br /> September 384 231 148 323 254 177 <br /> October 604 386 244 439 339 254 <br />Fall November 588 424 310 474 385 326 <br /> December 480 373 267 437 327 287 <br /> January 419 338 275 404 327 276 <br />Winter February 512 390 337 450 373 333 <br /> March 1168 860 705 913 659 554 <br /> <br />3 <br />