Laserfiche WebLink
<br />flow recommendation, which meets 3 of 3 criteria and is within the accuracy range of the <br />R2CROSS model is 9.0 cfs. The winter flow recommendation which meets 2 of 3 criteria and is <br />within the accuracy range of the R2CROSS model is 3.5 cfs (See Table I). <br /> <br />Hydrologic Data <br /> <br />After receiving the cooperating agency's biologic recommendation, the CWCB staff conducted <br />an evaluation of the stream hydrology to determine if water was physically available for an <br />instream flow appropriation. There are no currently operated or historically operated streamflow <br />gages for this reach. The closest gage CWCB staff found was the gage located on the San <br />Miguel River 3.4 miles west of the Cornet Creek drainage. The hydrograph was derived from <br />data collected by the USGS stream gage for the San Miguel River near Telluride, CO (ID <br />#09171200), which has a drainage area of 42.8 square miles (see below). The drainage area of <br />Cornet Creek is approximately 3.3 square miles. Staff used a basin apportionment method to <br />estimate stream flows for Cornet Creek (See Gage Summary in Appendix C). The period of <br />record for this gage was 1959 to 1965, the period of record used by staff in their analysis was <br />1959 - 1965, or seven years of record. Table 2 below displays the estimated flow of Cornet <br />Creek, in terms of a percentage of exceedence. <br /> <br />Table 2: Estimated Stream Flow on Comet Creek: <br />Exceedence Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br />10/0 1.4 1.5 3.9 8.0 31.2 36.1 32.1 15.8 7.1 3.7 2.6 1.8 <br />50/0 1.3 1.5 2.4 6.9 26.9 32.0 27.6 9.3 5.6 3.1 2.2 1.5 <br />10% 1.2 1.5 1.8 6.0 18.4 27.7 20.7 7.3 5.0 2.9 2.2 1.5 <br />20% 1.2 1.4 1.5 4.7 14.2 23.9 15.5 5.9 4.3 2.5 2.0 1.4 <br />80% 1.1 1.1 1.1 1.7 5.4 10.2 4.2 3.0 2.1 1.8 1.5 1.2 <br />90% 1.0 1.1 1.1 1.2 3.4 8.9 3.4 2.5 2.0 1.7 1.5 1.2 <br />95% 1.0 1.1 1.1 1.2 2.8 7.7 3.1 2.2 1.9 1.7 1.5 1.0 <br />99% 1.0 1.1 0.9 1.2 2.2 6.2 2.5 2.1 1.8 1.6 1.4 1.0 <br /> <br />Estimated Stream Flow on Cornet Creek <br /> <br />10 <br /> <br /><f) <br />'t3 5 <br /> <br />o <br /> <br />Jan <br /> <br />Feb <br /> <br />Mar <br /> <br />Apr <br /> <br />May <br /> <br />Jun <br /> <br />Jul <br /> <br />Aug <br /> <br />Sep <br /> <br />Oct <br /> <br />Nov <br /> <br />Dec <br /> <br />Month <br /> <br />-4- <br />