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<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 />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Cross <br />Section <br />Number <br /> <br />General <br />Stream <br />Thalwe9 <br />Sta. Elev. <br /> <br />192291 173+30 5352.3 <br /> <br />193371 174+20 52.9 <br /> <br /> <br />197521 178+55 56.4 <br /> <br /> <br />204381 185+50 60.0 <br /> <br />205681 186+80 60.0 <br /> <br />206121 187+45 60.2 <br /> <br />206581 187+70 61.0 <br />210391 191+50 63.5 <br />216221 197+45 68.0 <br />222031 203+60 72.5 <br /> <br />228961 209+50 74.1 <br /> <br />231821 210+35 74.6 <br />231831 211+20 74.9 <br /> <br />231841 212+00 75.0 <br /> <br /> <br />237611 218+25 80.3 <br /> <br /> <br />241121 221+85 80.9 <br /> <br /> <br />245751 226+20 85.0 <br /> <br />248651 228+85 87.5 <br /> <br />249101 229+30 88.0 <br />249621 229+95 88.2 <br /> <br />TABLE IV-2 (cont,) <br />FLOODPLAIN AND fLOODWAY INFORMATION <br />RALSTON CREEK (cont,) <br /> <br />1 CO-Year <br />Discharge <br />cfs <br /> <br />10Q-Yee.r <br />Water Sur. <br />Elev. <br /> <br />100-Year Floodplain <br />Floodplain Floodplain <br />Top WIdth Velocity <br />Cft) Cft/sec) <br /> <br />rJ oodway <br />Water Sur f . <br />tlevatlon <br /> <br />100-Year Floodway 1/2' Rise <br />Floodway Floodwav" Floodway <br />Top WIdth WIdth VelocIty <br />(ft) LT. RT. (ft/sec) <br /> <br />tOO-Year Floodway l' RIse <br />Floodway Floodway Floodway* <br />Water Surf. Top WIdth Width <br />Elevation Cft) LT. RT. <br /> <br />Floodway <br />Velocity <br />(ft/sec) <br /> <br />1,650 <br /> <br />1,670 <br /> <br />1.310 <br />1,090 <br />1,380 <br />1,170 <br />1.140 <br />1,310 <br /> <br />870 <br />625 <br />520 <br />635 <br />820 <br />860 <br /> <br />375 <br /> <br />420 <br /> <br />500 <br />480 <br /> <br />1,295 <br />1,400 <br /> <br />7,400 <br /> <br />5362.6 <br /> <br />5 <br /> <br />5361.5 <br /> <br />7,400 <br /> <br />62.8 <br />64.8 <br />71.0 <br /> <br />4 <br /> <br />62.8 <br />65.6 <br />71.0 <br /> <br />7,400 <br />7,400 <br />7,400 <br />7,400 <br /> <br />71.8 <br />72.0 <br /> <br />8 <br />10 <br /> <br />13 <br /> <br />71.8 <br /> <br />7,400 <br /> <br />72.4 <br />74.5 <br />77.8 <br />80.5 <br />82.7 <br />85.0 <br /> <br />11 <br /> <br />72.1 <br />72.5 <br />74.8 <br /> <br />7,400 <br />7,400 <br /> <br />7,400 <br /> <br />7,400 <br /> <br />6,800 <br />6,800 <br />6,800 <br /> <br />86.0 <br /> <br />86.4 <br /> <br />10 <br /> <br />7 <br />9 <br /> <br />77.6 <br />81,0 <br /> <br />6,800 <br /> <br />87.6 <br />89.0 <br />93.3 <br />98.4 <br />98.7 <br />99.6 <br /> <br />6 <br /> <br />7 <br /> <br />83.0 <br /> <br />6,800 <br /> <br />6,800 <br /> <br />6,800 <br /> <br />6,800 <br /> <br />6,800 <br /> <br />11 <br /> <br />85.3 <br /> <br />8 <br /> <br />86.3 <br /> <br />6 <br />9 <br />10 <br /> <br />86.7 <br />88.0 <br />89.3 <br /> <br />10 <br /> <br />93.1 <br /> <br />10 <br /> <br />98.1 <br />98.5 <br />99.9 <br /> <br />11 <br /> <br />8 <br /> <br />* As measured from design channel centerline, looking in the downstream direction. <br /> <br />670 <br /> <br />640 <br /> <br />1, 020 <br /> <br />830 <br /> <br />830 <br /> <br />830 <br />835 <br />960 <br />535 <br /> <br />450 <br /> <br />375 <br /> <br />415 <br /> <br />425 <br /> <br />430 <br />235 <br />145 <br /> <br />285 <br /> <br />265 <br />275 <br />355 <br /> <br />660 <br />620 <br />875 <br />680 <br />690 <br />685 <br /> <br />690 <br />630 <br /> <br />345 <br /> <br />350 <br />290 <br />250 <br />270 <br />325 <br />180 <br />135 <br /> <br />155 <br /> <br />205 <br />235 <br />285 <br /> <br />IV-9 <br /> <br />580 <br /> <br />80 <br /> <br />10 <br /> <br />590 <br /> <br />10 <br /> <br />5361.5 <br />62.6 <br />66.1 <br />71.0 <br />71.9 <br />72.2 <br />72.7 <br />75.1 <br /> <br />530 90 11 <br />460 415 7 <br /> <br />275 405 11 <br /> <br />280 410 13 <br />275 410 12 <br /> <br />280 410 11 <br />240 390 8 <br /> <br />200 145 12 <br />290 70 6 <br /> <br />280 10 8 <br /> <br />270 -20 13 <br />300 -30 13 <br />325 0 8 <br />100 80 10 <br />95 40 10 <br /> <br />95 60 12 <br /> <br />70 135 12 <br />70 165 13 <br />85 200 12 <br /> <br />Note: Floodway descriptions of "1/2' Rise" and "I' Rise" represent maximum increases in the Energy Grade Line Elevation and not necessarily the water <br />surface elevation. <br /> <br />80 <br /> <br />550 90 7 <br />510 510 7 <br /> <br />275 555 11 <br /> <br />280 550 13 <br /> <br /> <br />275 555 12 <br /> <br /> <br />280 555 11 <br /> <br /> <br />260 700 7 <br /> <br />235 300 11 <br />320 120 5 <br /> <br />77.2 <br /> <br />81.4 <br /> <br />300 75 7 <br />320 95 12 <br />340 85 9 <br />355 75 7 <br />100 135 9 <br />95 50 10 <br />95 190 11 <br />70 195 12 <br />70 205 13 <br />100 255 9 <br /> <br />83.5 <br />85.1 <br />85.2 <br />86.9 <br /> <br />88.3 <br /> <br />89.8 <br /> <br />93.3 <br /> <br />98.1 <br />98.4 <br />98.7 <br />