Project Description
Second Creek originates southeast of Peņa Boulevard and E-470 and flows in a northwesterly direction until its confluence with the South Platte River. The project includes both a Major Drainageway Plan (MDP) and a Flood Hazard Area Delineation (FHAD) for the portion of the Second Creek watershed upstream of Denver International Airport (DIA). Included in the major drainageway plan are two smaller tributaries, Possum Gully and Gopher Gulch.
The Second Creek watershed upstream of DIA encompasses approximately 16 square miles. The watershed is primarily undeveloped, however, the City of Aurora has approved several development plans within the watershed. The City of Aurora and the City and County of Denver have an intergovernmental agreement (IGA) that specifies the allowable peak flow from a planned regional detention pond near the boundary between the two cities. The MDP will incorporate the requirements of the IGA.
Goals of the MDP include development of watershed hydrology that reflects both existing and future conditions; identification of potential problem areas; development of drainage improvement alternatives to alleviate the identified problems; selection of a preferred drainage improvement alternative; preliminary design of the preferred alternative, and development of estimates of probable costs for the preferred alternative. Interim deliverables will include: a Baseline Hydrology Report, an Alternatives Evaluation (Phase A) Report, and a Conceptual Preliminary Design (Phase B) Report. The final deliverable will be a Planning Report in the form of an electronic plan.
The FHAD will update the floodplain along Second Creek and provide the information needed for management of the floodplain by local municipalities. If requested by the project sponsors, information developed for the FHAD will be submitted to the Federal Emergency Management Agency to revise the effective Flood Insurance Rate Maps for Second Creek.
Study Area Map
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Urban Drainage and Flood Control District
City of Aurora
