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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 />Tha I weg <br />Sta. Elev. <br /> <br />1281 1+65 5246.5 <br /> <br />7911 8+25 51 .7 <br /> <br /> <br />8601 9+00 52.7 <br /> <br /> <br />8821 9+30 53.0 <br /> <br /> <br />11001 11+30 54.9 <br /> <br /> <br />15921 16+20 58.8 <br /> <br />23481 22+35 64.3 <br /> <br />28261 23+00 64.8 <br /> <br />29841 24+75 66.0 <br /> <br /> <br />29981 25+20 66.1 <br /> <br /> <br />31001 26+65 67.0 <br /> <br />37621 33+00 <br /> <br />69.8 <br />75.0 <br /> <br />44851 38+40 <br /> <br />44861 39+70 <br /> <br />76.9 <br />77.6 <br /> <br />47581 41+75 <br />48581 42+85 <br /> <br />78.0 <br />78.1 <br /> <br />49181 43+70 <br /> <br />52151 46+25 <br />54751 48+55 <br /> <br />79.5 <br />80.5 <br /> <br />55951 49+50 <br /> <br />80.7 <br /> <br />TABLE IV-2 <br />FLOODPLAIN AND FLOODWAY INFORMATION <br />RALSTON CREEK <br /> <br />100-Year <br />Discharge <br />cfs <br /> <br />100-Year <br />Water Sur. <br />Elev. <br /> <br />100-Year Floodplain <br />Floodplain Floodplain <br />Top Width velocity <br />(ft) (ft/sec) <br /> <br />100-Year Floodway 1/2' Rise <br />Floodway Floodway FloodwaY* Floodway <br />Water Surf. Top Width Width Velocity <br />Elevation (ft) LT. RT. (ft/sec) <br /> <br />lOO-Year Floodway l' Rlse <br />Floodway Floodway Floodway< <br />Water Surf. Top Width Width <br />Elevation eft) LT. RT. <br /> <br />2,800 <br /> <br />2.000 <br /> <br />1,675 <br />1,800 <br />1,850 <br />1.570 <br /> <br />1,045 <br />1,330 <br /> <br />820 <br />810 <br /> <br />1,030 <br /> <br />990 <br /> <br />1.340 <br />1,320 <br />1,200 <br />775 <br /> <br />790 <br />160 <br />450 <br />560 <br /> <br />600 <br /> <br />735 <br /> <br />600 <br /> <br />735 <br />530 <br />860 <br /> <br />700 <br /> <br />1,015 <br /> <br />820 <br /> <br />800 <br /> <br />630 <br /> <br />550 <br /> <br />575 <br /> <br />610 <br />665 <br />645 <br /> <br />660 <br /> <br />535 <br />310 <br /> <br />350 <br /> <br />* As measured from design channel centerline, looking in the downstream direction. <br /> <br />9,800 <br /> <br />5254.8 <br /> <br />9 <br />11 <br />8 <br /> <br />5255.3 <br /> <br />60.0 <br />62.2 <br /> <br />315 285 <br /> <br />715 20 <br /> <br /> <br />705 -105 <br /> <br />700 35 <br /> <br /> <br />450 80 <br /> <br />560 300 <br />650 50 <br /> <br />625 390 <br />645 175 <br /> <br />645 155 <br /> <br />550 80 <br /> <br />440 <br /> <br />525 <br /> <br />535 <br /> <br />75 <br />225 <br /> <br />560 <br /> <br />540 <br /> <br />500 <br /> <br />625 <br />500 <br />660 <br />430 <br />770 <br />695 <br />600 <br />555 <br />350 <br />435 <br /> <br />440 <br /> <br />600 <br />610 <br />635 <br /> <br />480 <br /> <br />300 <br />290 <br /> <br />310 250 <br /> <br />520 20 <br /> <br />605 -105 <br />590 35 <br /> <br />420 80 <br />490 170 <br /> <br />380 50 <br /> <br />380 390 <br />430 175 <br /> <br />445 155 <br /> <br />490 60 <br /> <br />270 <br />415 <br />435 <br />405 <br />370 <br />340 <br /> <br />220 <br /> <br />70 <br /> <br />100 <br /> <br />IV-6 <br /> <br />Floodway <br />Velocity <br />( ft/sec) <br /> <br />11 <br />12 <br />12 <br />6 <br /> <br />12 <br /> <br />11 <br />13 <br />4 <br /> <br />13 <br /> <br />80 <br />20 <br /> <br />12 <br />6 <br />11 <br />5 <br />4 <br />10 <br />11 <br />11 <br />5 <br />15 <br />12 <br /> <br />9,800 <br /> <br />59.7 <br />61.9 <br />63.5 <br /> <br />5 <br />11 <br />9 <br />12 <br />4 <br />12 <br />11 <br /> <br />63.8 <br />64.9 <br /> <br />67.3 <br /> <br />73.1 <br />74.5 <br /> <br />74.2 <br /> <br />74.8 <br /> <br />440 <br />370 <br /> <br />340 <br /> <br />250 <br /> <br />80 <br />130 <br /> <br />9 <br /> <br />5255.8 <br />60.4 <br /> <br />5 <br />195 <br />240 <br /> <br />295 <br /> <br />260 <br />230 <br /> <br />190 <br /> <br />Note: <br /> <br />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 />9,800 <br />9,800 <br /> <br />9,800 <br /> <br />64.2 <br /> <br />9,800 <br /> <br />66.0 <br /> <br />9,800 <br /> <br />72.7 <br />74.2 <br /> <br />9,800 <br /> <br />9,800 <br /> <br />74.2 <br /> <br />9,800 <br /> <br />74.8 <br />76.1 <br /> <br />9,800 <br /> <br />9,800 <br />9,800 <br />9,800 <br /> <br />79.6 <br /> <br />86.0 <br />86.1 <br />86.2 <br />86.8 <br />87.1 <br /> <br />9,800 <br /> <br />9.800 <br /> <br />9,800 <br />9,800 <br /> <br />88.0 <br /> <br />9,800 <br /> <br />89.5 <br /> <br />9,800 <br /> <br />90.9 <br /> <br />5 <br /> <br />76.0 <br /> <br />9 <br />2 <br />2 <br />6 <br /> <br />79.5 <br />86.0 <br />86.1 <br />86.2 <br /> <br />10 <br /> <br />87.1 <br /> <br />9 <br />6 <br />13 <br />7 <br /> <br />87.2 <br /> <br />88.6 <br /> <br />89.5 <br /> <br />91.2 <br /> <br />11 <br />10 <br /> <br />62.1 <br /> <br />6 <br /> <br />64,2 <br /> <br />12 <br /> <br />64.9 <br /> <br />9 <br /> <br />67,5 <br />73.6 <br /> <br />12 <br />4 <br />12 <br /> <br />7501 <br /> <br />74.9 <br /> <br />11 <br /> <br />75.4 <br />77.1 <br /> <br />110 <br /> <br />8 <br />10 <br />5 <br /> <br />86.0 <br />86.2 <br />86.2 <br /> <br />79.6 <br /> <br />50 <br /> <br />4 <br /> <br />8 <br /> <br />275 <br /> <br />10 <br />10 <br />5 <br />14 <br />7 <br /> <br />90.9 <br /> <br />87.2 <br /> <br />320 <br /> <br />87.4 <br /> <br />285 <br />230 <br />220 <br /> <br />89.1 <br /> <br />89.7 <br />