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<br />inlets, pipes, and mhcellaneous drainage features in the basin. Hydraulic capacities were
<br />estimated for the culverts and bridges over the major drainageways. An inventory of !he major
<br />structures is presented on the tables contained In Appendix A of this report. A ~lruClures
<br />hydraulic capacity Wll.'i assumed 10 be reached when the hydraulic grade line equalled the
<br />adjacenl road surface.
<br />In addition 10 the bridge and culvert inventory, the existing storm sewer facilities were
<br />field verified and tabulated. The structures were measured and their condition noted. The
<br />capacities of these systems will be verified during the preliminary design ph ase of the projccl.
<br />
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<br />F100Qplain,
<br />Floodplains for the 1oo-year existing and fumre condition discharges have been
<br />delineated for Diny Woman Creek and Crystal Creek, The floodplain was estimated in order to
<br />a,sess where hydraulic inadequacies exist along the major drainageways. Floodways were also
<br />delineated as pan of the hydraulic analysis. This analysis assumed rigid boundary conditions to
<br />exist along the channel cross sections, The field inventory supplied roughness and bridge
<br />opening data for use in the HEC-2 modeling. These floodplains have bel:n compiled on the 200-
<br />foot scale, 2"foot contour strip mapping prepared as part of this study. The loo-year floodplains
<br />will be presented on lhe preliminary design drawings, The floodplain infonnation has been
<br />supplied to the Federal Emergency Management Agency for their eventual incorporation into the
<br />El Paso County Rood Insurance Study, A technical addendum has been prepared and suhmiued
<br />w the County under a separate cover. The addendum cont.:lins input and ou:put data for the
<br />hydrology, floodplain and f100dway analyses.
<br />The most significant areas of existi[lg flood hazard occurs along 1-25. between Crystal
<br />Creek and Dirty Woman Creek. An inadequate capacity culvert under the \-25 Frontage Road
<br />forces the lOO-year discharge in Crystal Creek to be diverted south along \.25 and into Dirty
<br />Woman Creek. Though no structures are threatened, Colorado Highway 105 and the [lonhbound
<br />\-25 embankment could be eroded. Elsewhere along Dirty Woman Creek, on single family
<br />residence in the vicinity of AuguSla Drive lies within the 100-year floodplain, The floodplain at
<br />this location is wide because of the inadequale culvert under Augusta Drive. In general,
<br />habitable srructures adjacem 10 Dirty Woman and Crystal creeks have been el evaledabovethe
<br />lOO-year wmer surface.
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