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<br /> <br />D <br /> <br />D <br /> <br />" <br />___L <br /> <br />BRIDGE CROSS SECTION <br /> <br />ELEVATIONS <br /> <br />2 <br />3 <br /> <br />Top of Roadway <br />Low Chord <br /> <br />Roadway Approach <br /> <br />, <br /> <br />Channe I Invert. <br /> <br />,., <br />~ <br />... <br />IT <br />... <br />rt <br />..... <br /> <br />ILLUSTRATION OF BRIDGE FLOW TYPES <br /> <br />~ <br />.. <br />~ 1) <br />;: <br />... <br />C <br />-' <br />... <br />.. , C <br />." <br />'" <br />... <br />.. <br />... <br />. D <br /> <br /> <br />DISCHARGE IN CFS <br />BRIDGE RATING CURVE <br /> <br /> FLOW COMnlTlOIt <br />A - Combined pressure under bridge, weir <br /> in oyer banks, weir over bridge <br />. - Combined pressu,re unde r bridge, we ir <br /> in overbanks <br />C - Combined low flow under bridge. weir <br /> In overbanks <br />D - Low flow under bridge <br />