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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 /> <br />Cross <br />Section <br />Number <br /> <br />General <br />stream <br />Thal.eg <br />5Ta. Elev. <br /> <br />118751 106+10 5309.1 <br /> <br />125401 112+75 <br />128201 115+40 <br />128801 116+45 <br />130411 117+85 <br /> <br />14.2 <br />16.4 <br />16.5 <br />19.2 <br /> <br />135281 121+35 21.9 <br /> <br /> <br />140301 125+20 24.5 <br /> <br /> <br />145551 129+35 26.6 <br /> <br /> <br />148751 131+15 28.3 <br /> <br /> <br />159951 142+25 34.3 <br /> <br />161341 143+30 34.8 <br /> <br />WITH VAN BIBBER FLOODWAY <br /> <br />161371 144+20 <br /> <br />35.0 <br /> <br />WITH VAN BIBBER FLOODWAY <br /> <br />162621 145+00 35.3 <br />171851 154+10 42.3 <br />175831 157+30 43.9 <br />181021 161+95 46.4 <br />182861 163+45 46.3 <br />182881 164+05 46,5 <br />190751 171+70 51.9 <br />191851 172+70 52.0 <br /> <br />I <br />I <br />I <br /> <br />Note: <br /> <br />TABLE IV-2 (cont.) <br />FLOODPLAIN AND FLOODWAY INFORMATION <br />RALSTON CREEK (cont.) <br /> <br />100-Year <br />Discharge <br />cfs <br /> <br />l00-Year <br />Water Sur. <br />Elev. <br /> <br />l00-Year Floodplain <br />FloodplaIn FloodplaIn <br />Top WIdth Velocity <br />(ft) (ft/see) <br /> <br />Flood.ay <br />Water Surf. <br />ElevatIon <br /> <br />100-Year Flood.ay 1/2' Rise <br />Flood.ay Flood.ay* Flood.ay <br />Top Width Width Velocity <br />(ft) LT. RT. lft/sec) <br /> <br />100-Year Flood.ay I' Rise <br />Flood.ay Flood.ay Flood.ay* <br />Water Surf. Top WIdth Width <br />Elevation (ft) LT. RT. <br /> <br />9,300 <br />9,300 <br />8,900 <br /> <br />5321.9 <br />26.2 <br />26.3 <br />26.4 <br />29.6 <br />33.6 <br />35.7 <br /> <br />8,900 <br /> <br />8,900 <br /> <br />8,900 <br />8,900 <br /> <br />8,900 <br />8,900 <br />8,900 <br /> <br />36.6 <br /> <br />37.5 <br />44.1 <br />44.5 <br /> <br />8,900 <br /> <br />8,900 <br /> <br />46.5 <br /> <br />8,900 <br /> <br />48.2 <br />50.4 <br /> <br />8,000 <br /> <br />8,000 <br /> <br />50.7 <br />54.3 <br /> <br />8,000 <br />8,000 <br /> <br />57.2 <br />58.7 <br />60.8 <br /> <br />8,000 <br /> <br />8,000 <br />7,400 <br /> <br />62.0 <br /> <br />220 <br />320 <br />75 <br />75 <br /> <br />135 <br />275 <br /> <br />290 <br />450 <br />485 <br />695 <br />740 <br /> <br />1,020 <br /> <br />1,370 <br /> <br />890 <br /> <br />1,025 <br />1,285 <br />1,435 <br />1,520 <br />1,520 <br />1,510 <br /> <br />26.5 210 160 50 12 <br />COINCIDENT WITH FLOODPLAIN NO ENCROACMNT <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br />29.5 125 95 30 15 <br /> <br />13 <br />12 <br />12 <br />15 <br />15 <br />14 <br />5 <br />6 <br /> <br />5322.2 <br /> <br />33.5 <br /> <br />36,1 <br /> <br />36.9 <br /> <br />10 <br /> <br />37.5 <br />44.6 <br /> <br />8 <br />10 <br /> <br />44.9 <br /> <br />7 <br /> <br />46.8 <br /> <br />10 <br /> <br />48.2 <br /> <br />5 <br /> <br />50.7 <br />51.3 <br />54.7 <br />57.1 <br />58.9 <br />61.3 <br />61.5 <br /> <br />8 <br />10 <br />10 <br />6 <br />8 <br />5 <br /> <br />170 <br /> <br />210 <br />210 <br /> <br />305 <br /> <br />245 <br /> <br />560 <br /> <br />525 <br />675 <br />475 <br />895 <br />415 <br />390 <br />650 <br /> <br />940 <br /> <br />965 <br /> <br />960 <br />755 <br />670 <br /> <br />150 <br />140 <br />125 <br />45 <br />100 <br /> <br />145 <br /> <br />255 <br />240 <br />530 <br />885 <br /> <br />940 <br /> <br />940 <br /> <br />690 <br />615 <br /> <br />30 <br /> <br />85 <br /> <br />140 <br /> <br />60 <br />70 <br />180 <br />200 <br />460 <br /> <br />440 <br />590 <br /> <br />330 <br />750 <br />160 <br />150 <br />120 <br />55 <br />25 <br />20 <br />65 <br />55 <br /> <br />13 <br /> <br />5322.5 <br />26.9 <br /> <br />145 <br /> <br />170 <br /> <br />30 <br />120 <br /> <br />IV-8 <br /> <br />Flood.ay <br />Velocity <br />( ft/see) <br /> <br />115 <br />50 <br /> <br />13 <br /> <br />12 <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />29.8 <br /> <br />15 <br /> <br />34.6 <br />36.5 <br />37,2 <br />37.6 <br />45.0 <br />45.3 <br /> <br />* As measured from design channel centerline, looking in the downstream direction. <br /> <br />maximum increases in the Energy Grade Line Elevation and not necessarily the water <br />Floodway descriptions of "1/2' Rise" and "I' Rise" represent <br />surface elevation. <br /> <br />5 <br /> <br />6 <br />12 <br /> <br />8 <br />It <br /> <br />II <br /> <br />46.8 <br /> <br />11 <br /> <br />48.3 <br />51.3 <br />51.8 <br />55.0 <br /> <br />5 <br /> <br />7 <br />10 <br />13 <br />7 <br />9 <br />10 <br /> <br />57.7 <br />58.9 <br /> <br />61.4 <br />61.5 <br /> <br />90 <br />160 <br />210 <br />300 <br />240 <br />315 <br />350 <br />635 <br />325 <br />820 <br />265 <br />250 <br />480 <br /> <br />870 <br />955 <br />950 <br /> <br />745 <br /> <br />670 <br /> <br />60 <br />115. <br />140 <br />120 <br />40 <br />95 <br />45 <br /> <br />105 <br />100 <br />400 <br />845 <br />930 <br />930 <br /> <br />680 <br />615 <br /> <br />70 <br /> <br />30 <br />45 <br />70 <br />180 <br />200 <br />320 <br />305 <br />590 <br />255 <br />750 <br />160 <br />150 <br /> <br />16 <br />13 <br />5 <br /> <br />6 <br />11 <br />9 <br />11 <br /> <br />9 <br /> <br />12 <br /> <br />80 <br /> <br />5 <br />8 <br />10 <br />12 <br />7 <br />8 <br /> <br />25 <br />25 <br />20 <br /> <br />65 <br />55 <br /> <br />9 <br />