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<br />_. <br /> <br />- <br /> <br />-.. <br /> <br />EXample 7.1- Determine the storm arran!)ement usin!) the alternating block using the <br />following information obtained from NOAA Atlas 2 - Precipitation-Frequency Atlas of the <br />Western United States - Volume III .. Colorado <br /> <br />10.minute rainfall amount= <br />3D-minute rainfall amount= <br />1-hour rainfall amounl= <br />2-hour rainfall amounl= <br />3-hour rainfall amounl= <br />6-hour rainfall amount= <br /> <br />Solution: <br /> <br />121 inches <br />2.11 inches <br />2.68 inches <br />3.06 inches <br />3.35 inches <br />3.80 inches <br /> <br />1. The rainfall amounts from above were plotted and values between known points were <br />interpolated and put into the second column of Table 7.1. <br /> <br />2. Table 7.x shows the final storm arran!)elllent. <br /> <br />Time <br />(min.) <br /> <br />Accum <br />Rainfall <br />(inches) <br /> <br />10 1.21 <br />20 1.66 <br />30 2.11 <br />40 2.31 <br />50 2.50 <br />50 2.55 <br />70 2.76 <br />80 2.84 <br />90 2.90 <br />100 2.96 <br />110 3.01 <br />120 3.06 <br />130 3.11 <br />140 3.16 <br />150 3.21 <br /> <br />Colorado Flood <br />llydrology Manual <br /> <br />Table 7.1 <br /> <br />Incr. <br />I~ainfall <br />(incI1es) <br /> <br /> --- <br /> .-- <br />(led <br /> Rainfall <br /> Intensity <br />s) (in/hr) <br /> .12 <br /> .12 . <br /> .12 <br /> .--- <br /> .12 <br /> - <br /> .18 <br /> .18 <br /> .18 <br /> .18 <br /> -- <br /> .24 <br />'- 22...-_ <br />- ...2~_ <br /> .30 <br /> - <br />- 2~_ <br /> .48 <br />.- ....l98 <br /> <br />Arran <br />Incr. <br />Rain <br />(inche <br /> <br />1.21 02 <br /> <br />.45 .02 <br /> <br />45 .02 <br /> <br />.~----~_. <br />'~___L~.~.~__ <br />.18 03 <br /> <br />.08 .03 <br /> <br />.08 .03 <br />.06 .04 <br />.06 05 <br /> <br />.05 .OS <br /> <br />.05 05 <br />.05 .06 <br /> <br />.05 .08 <br /> <br />05 18 <br /> <br />DRAFT <br /> <br />7.7 <br />