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<br /> " ^ Obstructions " ""'" flow
<br /> N ^ T", bridges present ,", main obstructions to the llood.
<br /> logon""81, '"' water sur/ace upstream of '"' bridges would "
<br /> several feet nigher-than it would " " '"' bridges were 00' ;0 olace.
<br /> This backwater eHect ;, usually dissipated ;0 less than 1,000 feet
<br /> upstr03m of '", bridges dU61 to; the steep ,,, Slopes. The diversion
<br /> 0 ^ . characteristics byraislog
<br /> ;~ > 0 $ dams also alter thechaonel the Channel
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<br /> .. N ^ ^ '" upstream and lowering ,", bed downstre"," of each structure. ,",
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<br /> . effectso! ,", raiSed ,,, decreases with iocreased/lows
<br /> " 50tll3t ,",
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<br /> c. 0 . ^ stag"5 ,,, major floods are more dependent on tile size of opening
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