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<br />I <br />I <br />II <br /> <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br /> <br />, <br /> <br />II <br />I <br />I <br />!I <br />I <br />II <br />I <br />I <br />I <br /> <br />Title of Study: <br />County: <br />Gage No. <br />Calculations By: <br /> <br />Peak DischarQe at UnQaQed Sites <br /> <br />Page 1 <br /> <br />FHBM - Town of Rico <br />Dolores <br />09165000 <br />jag <br /> <br />Gage: Dolores River Below Rico, CO <br />Date: <br /> <br />August 25, 2000 <br /> <br />Documentation <br />This workbook calculates peak discharges at ungaged sites based on peak discharges at gaged sites on the <br />same stream. The methodology is based on the following source: <br /> <br />8/25/00 <br />Ungaged_Hydrology .xls <br /> <br />CWCB. 1976. Manual for Estimating Flood Characteristics of Natural-Flow Streams in Colorado. <br />Technical Memorandum NO.1. Prepared in Cooperation with USGS. <br /> <br />Regression Equation Data <br /> <br />Q"U) = (~: r QT(G) <br /> <br />Where: <br /> <br />Ql1U) = <br /> <br />Ql1G) = <br />Au= <br /> <br />AG = <br />x= <br /> <br />peak discharge at ungaged site for recurrance interval T <br />weighted average discharge at gage sile for recurrance interval T <br /> <br />drainage area at ungaged site <br />drainage area at gaged site <br />exponent for each flood region <br /> <br />I Mountains I'" J <br /> <br />0.5 <AuIAG < 2.0 <br /> <br />82.75 square miles <br />105 square miles <br />0.79 <br /> <br />Return Percent Gaged Dis. Ungaged Dis. <br />Period Exceedance Ql1G) = Ql1UJ = <br />500 0.2 2,890 2,394 <br />200 0.5 2,710 2,245 <br />100 1 2,560 2,121 <br />50 2 2,390 1,980 <br />20 5 2,150 1,781 <br />10 10 1,930 1,599 <br />5 20 1,670 1,384 <br />2 50 1,220 1,011 <br />1.25 80 839 695 <br />1.11 90 673 558 <br />1.05 95 554 459 <br />1.01 99 372 308 <br /> <br />Limited by: <br /> <br />Discharge Calculations <br /> <br />Au = <br /> <br />AG = <br />x= <br />