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<br />I <br />I <br /> <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 />Thalweg <br />S+a. Elev. <br /> <br />10352 10+20 5421.6 <br /> <br />14942 14+10 23.6 <br /> <br />14962 15+10 24.8 <br /> <br /> <br />20552 20+40 26.5 <br /> <br /> <br />26002 25+50 31.8 <br /> <br /> <br />28892 27+05 32.2 <br /> <br />28912 28+75 <br /> <br />32812 32+15 <br /> <br />36752 36-1{)5 <br />43422 42+85 <br /> <br />48102 47+70 <br />56302 56-1{)5 <br /> <br />68532 68+40 <br />76002 75+75 <br /> <br />86542 86+40 <br />92852 92+50 <br /> <br />103602 103+25 <br />106922 106+55 <br /> <br />123622 123+35 <br /> <br />137802 137+60 5513.5 <br /> <br />32.5 <br />35.8 <br /> <br />41.0 <br /> <br />47.1 <br /> <br />48.7 <br /> <br />52.0 <br />62.5 <br />65.4 <br />71.4 <br />76.7 <br /> <br />86.2 <br /> <br />89.0 <br />98.9 <br /> <br />TABLE IV-2 (cont,) <br />FLOOOPLAIN AND FLOODWAY INFORMATION <br />LEYDEN CREEK <br /> <br />l00-Year <br />01 scharge <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 />Floodw.y Floodw.y Floodway* Floodw.y <br />W.ter Surf. Top Width Width Velocity <br />Elevation (ft) LT. RT. (ft/sec) <br /> <br />lOO-Year Floodway l' Rfse <br />Floodway Floodway Floodw.y* <br />Water Surf. Top Width Width <br />ElevatIon (ft) LT. RT. <br /> <br />1,660 <br />1,850 <br />2.430 <br /> <br />750 <br />670 <br /> <br />970 <br /> <br />100 <br /> <br />400 <br />565 <br />555 <br />540 <br /> <br />445 <br /> <br />910 <br /> <br />1,220 <br />1.310 <br />1,240 <br /> <br />2,600 <br /> <br />24.6 <br />31.1 <br /> <br />5 <br /> <br />25.1 <br /> <br />680 <br />350 <br /> <br />2,600 <br /> <br />2,600 <br /> <br />32.0 <br /> <br />90 <br /> <br />10 <br />5 <br />7 <br />7 <br />11 <br />10 <br />6 <br />10 <br /> <br />85 <br /> <br />2,600 <br /> <br />35.0 <br /> <br />31.0 <br /> <br />32.0 <br /> <br />520 <br /> <br />2,500 <br />2,500 <br /> <br />38.5 <br />40.0 <br />40.2 <br />42.8 <br /> <br />140 <br />95 <br /> <br />35.0 <br />38.7 <br />40.0 <br /> <br />180 <br /> <br />2,500 <br /> <br />2,500 <br /> <br />2,500 <br /> <br />46.9 <br /> <br />10 <br /> <br />4 <br /> <br />26.1 <br /> <br />290 <br /> <br />2,500 <br />2,500 <br />2,500 <br />2,400 <br /> <br />50.7 <br /> <br />54.3 <br /> <br />58.6 <br />65.6 <br />70.9 <br />75.8 <br /> <br />670 <br /> <br />20 <br /> <br />10 <br /> <br />180 <br /> <br />2,400 <br /> <br />2,400 <br /> <br />2,400 <br /> <br />81.8 <br /> <br />330 <br />340 <br /> <br />31.2 <br /> <br />5 <br />7 <br />8 <br /> <br />31.6 <br /> <br />290 <br />140 <br />90 <br /> <br />2,400 <br /> <br />91.9 <br />93.1 <br />5504.1 <br /> <br />85 <br /> <br />55 <br /> <br />2,400 <br /> <br />2,300 <br /> <br />2,300 <br /> <br />17.2 <br /> <br />35.5 <br />39.0 <br />40.0 <br /> <br />50 <br />60 <br /> <br />45 <br />25 <br /> <br />11 <br /> <br />10 <br />20 <br />140 <br />85 <br />50 <br /> <br />85 <br /> <br />60 <br /> <br />280 <br /> <br />160 <br />150 <br />55 <br />40 <br /> <br />) <br /> <br />IV-ll <br /> <br />Floodw.y <br />Velocity <br />(ft/sec) <br /> <br />10 <br /> <br />25 <br /> <br />11 <br />8 <br />7 <br />8 <br />11 <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />4 <br /> <br />10 <br /> <br />145 <br /> <br />54.4 <br />58.6 <br /> <br />200 <br /> <br />5 <br /> <br />9 <br /> <br />65.6 <br />71.2 <br /> <br />130 <br />290 <br />175 <br /> <br />5 <br />8 <br />9 <br />4 <br /> <br />76.0 <br /> <br />105 <br /> <br />40 <br />60 <br />50 <br />60 <br /> <br />40 <br />160 <br /> <br />120 <br />200 <br /> <br />9 <br />5 <br />9 <br />6 <br />9 <br /> <br />54.4 <br />58.6 <br />65.6 <br />71.5 <br />76.2 <br /> <br />115 <br /> <br />70 <br />240 <br /> <br />205 <br /> <br />100 <br /> <br />115 <br /> <br />85 <br /> <br />40 <br />60 <br />10 <br />40 <br /> <br />35 <br />160 <br />55 <br />195 <br />60 <br /> <br />9 <br />5 <br /> <br />9 <br /> <br />7 <br />10 <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />500 <br />165 <br />400 <br /> <br />5 <br /> <br />93.3 <br /> <br />140 <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />50 <br /> <br />190 <br /> <br />240 <br /> <br />8 <br /> <br />6 <br /> <br />5517.3 <br /> <br />240 <br /> <br />* As measured from design channel centerline, looking in the downstream direction. <br /> <br />115 <br /> <br />130 <br /> <br />COINCIDENT WITH FLOODPLAIN NO ENCROACHMENT <br /> <br />5 <br /> <br />25 <br /> <br />5 <br /> <br />93.3 <br /> <br />105 <br /> <br />50 <br /> <br />25 <br /> <br />5 <br /> <br />5 <br /> <br />5517.3 <br /> <br />190 <br /> <br />Note: Floodway descriptions of "1/2' Rise" and "1' Rise" represent maximum increases in the Energy Grade Line Elevation and not necessarily the water <br />surface elevation. <br />