Laserfiche WebLink
<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 />jl <br />'I <br />I <br />I <br /> <br />its downstream end. By the time the peak reaches the <br />bottleneck, the lwoer area is contributing very little to <br />the overall basin flow. Therefore, a physical interpretation <br />of the basin would suggest that discharges should not increase <br />sharply through this reach. At the upstream end of the study, <br />the discharge comparison for the 50-year and 100-year events <br />is very good, as should be expected at this point. <br /> <br />The 10-year event at the upstream end of the study reach does <br />not compare favorably. Since the model was calibrated for a <br />5-year event, and because recent history would dictate a <br />10-year event of fairly low magnitude, the results from the <br />S\'l~IM model are more realistic. <br /> <br />Further information available through the SWMM model shows <br />that the effect of channel storage is to produce a constant <br />peak throughout a major part of this basin. Hence, not only <br />is the peak constant through the study reach because of the <br />bottleneck, but it is also constant up to Douglas Reservoir <br />because of channel s~orage. <br /> <br />Also, in the lower developed reaches of the basin, the immediate <br /> <br />response of the impervious areas is shown in Figure 7 for the <br /> <br />:~!i!~~~ <br />