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70 <br />Purpose' A time of concentrot~on from which o log time con be computed <br />• must be oDfolned IOr nydro~rOUn COn SiruCtiOn re Dre se ntin(J run011 from <br />a wolersned VdriOUS methOCS Of e•.tim01in9 time Of COnCentrdt iOn~Td •OrC Cs •'OIIGwS: <br />A ESi I'dATING Tc FF.G;l STREs:tv: H1'CR,C.ULICS ;SGS GUIC~1 <br />I ODro~n streom reocnes one channel cross~sec'~cns from field surveys <br />2 rind Op Dr OS~mdte CnGnnel bdn k.'u 11 diSChdrGe Idr eCCn reOC h. <br />3 Gcmpute cveroge velouty for the Donkfull d~scnorge of eocn reocr.. <br /><. USC fne C:erCQe ve WC~:y Cnd the volley length 01 the reCU~ 10 COm pule <br />irpvel time through eocn reoch. <br />5 Ado trove) Mmes of reocnes to get To. <br />Note Appendit g "Nydroulic Gompuictions~~ presents methods of computing <br />Flows in ndlurcl chonnels. <br />5 ESTir•tt;Tlr;G T~ =RCr.. vcEOGITY ESTIr,::.TES A^;p v; ,;TERGGUaSE ~E":GTHS <br />DESIGr: OF Srnnl, Dn :•„ <br />1'elouty ~slimete Gu1de <br />• <br />I <br />U S NOvy - TeCnn{cCl ?uDI~cOTion <br />NovCOC~.s T~-pw-5 <br />i O ble 69 , h•~orOn 1953 <br />Avero;e sld,e o/ channel averoae <br />IrDm fCr t7:e st point f0 velOGly, i <br />Owlet, in Ce rC ent oet per s2:Cn; <br />I to 2 2.0 <br />2 to 4 }.p <br />--- Q ?o~ 6 --- 4 . C <br />-- <br />6 to 10 - <br />5.0 <br /> <br />Teats H~gnwo~-~epor'ment <br />Rotional Des~Sn o' Culverts <br />cnd 3r~dSes, OctcDer ;9:01 <br /> AyorCgP Y2bUtr feet D-°r 5eC7nt1 <br />Slope <br />' <br /> oodidnas <br />fti Pcslures r;clcrai <br />in <br />.Up;er Ddfl~pn <br />~;,~per rrLdn <br />~^Cnn?~ cOt <br />percent <br /> ~otersnec' wDterseeel, Ren czl~nzc <br /> <br />0 <br />, I 0 I-S - -I <br />C <br />- <br />4 7 - <br />2.0 --- <br />}.0 - <br />} 0 <br /> <br />8 II } 0 ~ 0 5 0 <br />l2 -IS }.5 a.5 B 0 <br />r~p~n 72 T~m~ of (on~enve4on emmme, fb~eel I of 7.) :l9-D-NbI. <br /> <br /> <br />