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<br />Affected communities: City and County of Denver
<br />Name of study to be formally acted on: "Floodplain Information Report, Hydrology Addendum, City
<br />and County of Denver, Colorado" dated June 2007, by Michael Baker, Jr., Inc.
<br />Studied streams: Coon Creek, First Creek, Incinerator Lake, Sloans Lake, Vaile Lake, Marston Lake
<br />North, Third Creek, Boxelder Creek, Second Creek, First Creek TributalY
<br />Technical Issues: This report was prepared by Baker for the CWCB in order to provide discharge
<br />information for approximate stream reaches pOlirayed on the Flood Insurance Rate Map (FIRM) for the
<br />City and County of Denver. This study did not determine new discharges for these approximate reaches.
<br />Rather, the study aggregated information previously available from a number of different sources, and
<br />presented it in one location for ease of use and reference. Due to the complex urban nature of their
<br />flooding, approximate discharges could not be determined for the following sources: Westerly Creek,
<br />Berkeley Lake, City Park Lake, Duck Lake, Marston Lake, Rocky Mountain Lake, and Windsor Lake. A
<br />detailed hydrologic analysis must be done to determine discharges for these flooding sources. There is no
<br />hydraulic data to support the approximate floodplain delineations for the subject stream reaches. This
<br />study backs up information already presented in the FIRMs for the affected communities. No floodplain
<br />delineations were revised by this report.
<br />Community response: The City and County of Denver was contacted by telephone and was receptive to
<br />the CWCB's proposed action to designate and approve the floodplain information in the subject study. In
<br />addition, this study merely supports the regulatory FIRMs already adopted and used by the City and
<br />County of Denver, and does not modify any regulated floodplain areas.
<br />Staff findings: CWCB staff has determined that the subject 100-year approximate floodplain information
<br />for the studied stream reaches is conformance with the CWCB's mles and regulations for floodplain
<br />designation and approval. The CWCB staff has relied on the technical competence of Michael Baker, Jr.,
<br />Inc., who produced the study, but also performed an independent technical review of the report. Staff
<br />therefore endorses this study as containing the most current floodplain information available and urges the
<br />affected communities to adopt said study for land use regulation purposes pursuant to statutory authority.
<br />Staff recommendation: Staff recommends that the Board: 1) designate and approve the 100-year detailed
<br />floodplain information contained in said report within the City and County of Denver, and 2) authorize
<br />staff to prepare a floodplain resolution to be signed by the Director and transmitted to the City and County
<br />of Denver, and to the Urban Drainage and Flood Control District and to FEMA. This action is
<br />recommended in order to meet statutory requirements.
<br />
<br />4) Consent A2enda Item 2.d
<br />Floodplain resolution number: FPR 07-605
<br />Affected communities: Jefferson County, City of Arvada, City of Bow Mar, City of Edgewater, City of
<br />Golden, Town of Lakeside, City of Lakewood, Town of Morrison, Town of Mountain View, City of
<br />Westminster, City of Wheat Ridge
<br />Name of study to be formally acted on: "Floodplain Information Report, Hydrology Addendum,
<br />Jefferson County and Incorporated Areas, Colorado" dated June 2007, by Michael Baker, Jr., Inc.
<br />Studied streams: Barbara Gulch, Bear Creek, Beaver Brook, Blue Creek, Buffalo Creek, Coal Creek,
<br />Coon Creek, Cressmans Gulch, Deer Creek, Elk Creek, Ketner Creek, Leyden Creek, Little Dry Creek,
<br />Massey Draw, NOlih Fork Deer Creek, North Fork South Platte River, NOlih Turkey Creek, Sloans
<br />Lake Basin, Smart Ditch, South Turkey Creek, Tributary 'B' of Little Dry Creek, Tributary 'c' of
<br />Little DIY Creek, Tucker Gulch, Unnamed Tributary to Dutch Creek, Unnamed Tributary to Lena
<br />Gulch, Unnamed Tributary (north of Standley Lake), Unnamed Tributary (south of Standley Lake),
<br />Walnut Creek, Woman Creek
<br />
<br />Flood Protection. Water Project Planning and Financing. Sn-eam and Lake Protection
<br />Water Supply Protection. Conservation Planning
<br />
<br />..J.
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