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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />i. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />. <br />. <br />. <br />. <br />. <br />I. <br />I. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />,. <br />'. <br />I. <br />. <br />I. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Title 01 Study: <br />County: <br />Gage No, <br />Ungaged Site: <br />Calculations By: <br /> <br />Peak Discharqe at Unqaqed Sites <br /> <br />Page 3 <br /> <br />FHBM - Dolores County <br />Dolores <br />09165000 Gage: Dolores River Below Rico, CO <br />Dolores River at East Montezuma County Line <br />jag Date: <br /> <br />September 14, 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 lollowing source: <br /> <br />CWCB, 1976, Manual for Estimating Flood Characteristics 01 Natural-Flow Streams in Colorado, <br />Technical Memorandum No. 1. Prepared in Cooperation with USGS. <br /> <br />Regression Equation Data <br /> <br />QTlUI = (~~ r Q"", <br /> <br />Where: <br /> <br />QnvJ = <br /> <br />QncJ = <br />Av= <br /> <br />AG = <br />x= <br /> <br />Limited by: <br /> <br />Discharge Calculations <br /> <br />Au= <br /> <br />A G = <br />x= <br /> <br />Return <br />Period <br />500 <br />-- - -- <br />200 <br />100 <br />50 <br />20 <br />10 <br />5 <br />2 <br />1.25 <br />1.11 <br />1.05 <br />1,01 <br /> <br />9/14/00 <br />Ungaged_Hydrology,xls <br /> <br />peak discharge at ungaged site lor recurrance interval T (cIs) <br />weighted average discharge at gage site lor recurrance interval T (cIs) <br />drainage area at ungaged site (square miles) <br />drainage area at gaged site (square miles) <br />exponent lor each flood region <br /> <br />Moun~~~s__~~~-=--~ <br /> <br />0,5 < A viA G < 2,0 <br /> <br />106.04 square miles <br />105 square miles <br />0,79 <br /> <br />Percent <br />Exceedance <br />0,2 <br />------ <br />0.5 <br />1 <br />2 <br />5 <br />10 <br />20 <br />50 <br />80 <br />90 <br />95 <br />99 <br /> <br />Gaged Dis, <br />Q nG, = (cIs) <br />.. . .2..!l90__ <br />2,710 <br />2,560 <br />2,390 <br />2,150 <br />1,930 <br />1,670 <br />1,220 <br />839 <br />673 <br />554 <br />372 <br /> <br />Ungaged Dis. <br />Qnu, = (cIs) <br />2,913 <br />--- - ---- <br />2,731 <br />2,580 <br />2,409 <br />2,167 <br />1,945 <br />1,683 <br />1,230 <br />---------- <br />846 <br />678 <br />558 <br />375 <br />