Laserfiche WebLink
152 r <br /> Table 6.3A.--Local-storm PMP computation, Colorado River, Great Basin oand <br /> California drainages. For drainage average depth PMP. <br /> table 6.3B if areal variation is required. <br /> Drainage Na/t1c�V /�FA'A,('s/v'f C �s/n/ . Area <br /> 2 - mi2 tkm-1 <br /> Latitude ?7°45-' Longitud= /68° 7 Minimum Elevation („,9GL') ft turr [ <br /> Steps correspond to those in sec. 6.3A. p <br /> 1. Average 1-hr 1-mi2 (2.6-km2) PMP for /. / in. ( ) [. <br /> drainage [fig. 4.5]. <br /> 2. a. Reduction for elevation. [No adjustment <br /> for elevations up to 5,000 feet (1,524 m): <br /> 5% decrease per 1,000 feet (305 m) above O X E..._ <br /> 5,000 feet (1,524 m)]. <br /> b. Multiply step 1 by step 2a. <br /> 24,2=___ in. (am) <br /> 3. Average 6/1-hr ratio for drainage [fig. 4.7]. 2 :5 <br /> Duration hr <br /> 1 4 1 2 3/4 1 2 3 4 5 6 <br /> 4. Durational variation r <br /> for 6/1-hr ratio of <br /> step 3 [table 4.4]. 711 9f /4' /p/ /24 /2f O % E. <br /> 5. 1-mi2 (2.6-km2) PMP for <br /> indicated durations 6 / . �L� 1� O, in. (m-) [ <br /> [step 2b X step 4]. <br /> 6. Areal reduction .Zle_ �� 7g X C <br /> [fig. 4.9]. S(o li.� lilt <br /> 41110 [ <br /> 7. Areal reduced PMP <br /> 5 X 6]. 21c�=1-. <br /> 8. Incremental PMP . <br /> [successive subtraction [ <br /> / „ J , , in (�} <br /> in step 7]. +T <br /> 3,1/ AZ. .0.5.- 0.5" } 15-min. increments <br /> 9. Time sequence of incre- <br /> mental PMP according to: <br /> Hourly increments Q, 0.2 in. �) <br /> [table 4.7]. O. AI, <br /> Four largest 15-min. C <br /> incremen ts [table 4.8]. Lv 1✓ in. (— <br /> I. <br /> I. <br /> . ._ ____ ... _. <br />