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<br /> <br />t <br /> <br />susceptable to washing out and material could clog bridges downstream. <br />The C&S Railroad will pass a maximum flood of about SO-year frequency. <br />For larger floods the tracks act as a barrier to floodflow resulting <br />in considerable shallow flooding. The I-2S highway acts as a consid- <br />erable constriction causing water to be ponded. Future flood crests <br />and pertinent elevations at bridge and culvert crossings within the <br />study area are listed in Table 3. <br />Velocities of Flow. Computed water velocities during floods <br />depend on the size and shape of the cross sections, conditions of the <br />stream channel, and the bed slope. Listed in Table 4 are computed <br />velocities and representative cross sections throughout the study <br />area during the 100- and SOO-year floods. <br />Rates of Rise and Duration of Flooding. Flood character- <br />istics of the lOO- and SOO-year floods are shown in Table 5. These <br />data reflect averaged maximum conditions on the Cucharas River. A <br />stage hydrograph for the SOO-year frequency flood on the Cucharas <br />River is shown on Plate 2. <br />Future Flood Heights. Figures 2 and 3 show the heights <br />that would be reached by the lOO- and SOO-year floods at selected <br />locations within the flood plains considered in this study. <br /> <br />~ <br /> <br />0- <br /> <br />ds, <br /> <br />~- <br /> <br />)r <br /> <br />lS <br />