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HYDROLOGIC ZONES IN THE STATE OF COLORADO <br />Identify the hydrologic zone for your project site: Zone 1, 2, 3 or 4. <br />Zone 1: South Platte, Republican, Arkansas, and Cimarron River Basins <br />Zone 2: San Juan, Upper Rio Grande, Upper Colorado, and Gunnison River Basins, and <br />Green River Basin below Confluence with the Yampa River <br />Zone 3: Yampa and Green River Basins above confluence of Green and Yampa Rivers <br />Zone 4: North Platte River Basins <br />Definition of these four zones: <br />I <br />I <br />I <br />i -- <br />I <br />I? <br />I <br />I <br />i <br />I <br />I <br />I <br />N.. 19 <br />Rr,lunr uad ro dr.rt p .gquoJiuu jar 1. wd /99.p <br />I.l,rwWrr. <br />Design Parameters for Various Zones <br />Zone 1 - Hour 2 - hour 3 - Hour <br /> a b c d e f m n r <br />1 0.2180 0.7090 0.0000 1.8970 0.4390 -0.0080 0.3420 0.6580 0.5970 0.4030 <br />2 -0.0110 0.9420 0.0000 0.4940 0.7550 0.0000 0.3410 0.6590 0.5690 0.4310 <br />3 0.0190 0.7110 0.0010 0.3380 0.6700 0.0010 0.2500 0.7500 0.4670 0.5330 <br />4 0.0280 0.8900 0.0000 0.6710 0.7570 -0.0030 0.2500 0.7500 0.4670 0.5330 <br />Duration in minutes 5.00 10.00 15.00 30.00 <br />Ratio to one-hr Depth 0.29 0.45 0.57 0.79 <br />UD-RainZone 0.01a, ZONES 4/16/2009,12:00 PM <br />COLORADO <br />a.. <br />n is m >t w.:: w ....»a...... <br />"is