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<br />j,.' <br /> <br />The annual peak discharges at the Dolores River index point locE:tions <br /> <br />Here determined to be caused by elther 8no.mH~lt runoff for events up to <br /> <br />aad including the fifty year flood events, or rain runoff for frequency <br /> <br />events rarer than the fifty year. A gener"l:Lz,ed snowmelt hydrograph (Figure <br /> <br />15) was developed, using the 1941 snow,"(~lt (:ve:at as a guide, for calculating <br /> <br />the ten and fifty year snOl{melt hydrographs ;"0:: each of the l;hree index <br /> <br />point locations in the Dolores basin. These h::'drographs were calculated <br /> <br />using the ratio of the peak discharges of the generalized snowrnelt h;rdrograph <br /> <br />to the ten and fifty year peak disch,.rge vahl.en, <br />\- <br /> <br />Rain-runoff hydrographs for various frequencies were devE!lop<!d at all <br /> <br />the index point locations using the }."atio of th<" frequency eV.>Ilt peak <br /> <br />dischaq;e to the SPF peak discharge. <br /> <br />Table 11 shows a tabulation of hydr08raph "atios t'D be used for each <br /> <br />index point location to calculate the. frequency flood hydrograph desired. <br /> <br />TABL~ 11 <br /> <br />HYDROGRAPH RATIOS <br />(Of Index- Locatio;-SI'F H0irographs) <br /> <br />Index Location <br /> <br />10-Yr 50--Yr lOO-YlC .?QO-YE SPF <br />-~ ----..,.-'" --.- <br />0./.6* 0.7'1':\' 0.47 1. 2:; 1..0 <br />0.84* 1. 24'" 0.51 1. 26 l.0 <br /> <br />Dolores River below the <br />confluence of Stoner Ck. <br /> <br />"est Dolores River at <br />Houth <br /> <br />Dolores River below the <br />confluence of Lost <br />Can}-on Ck. <br /> <br />0.28* <br /> <br />0.47:1; <br /> <br />0.32 <br /> <br />1.00 <br /> <br />1.0 <br /> <br />Lost Canyon Creek at <br />Houth. <br /> <br />0.11 <br /> <br />0.31 <br /> <br />0.4.5 <br /> <br />0.97 <br /> <br />l.0 <br /> <br />* Sl1Ol{melt Hydrograph (Figure 15) should be. l1s"d. <br /> <br />14 <br />