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FLOOD10334 (2)
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FLOOD10334 (2)
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Last modified
1/29/2010 10:12:08 AM
Creation date
5/8/2007 2:24:39 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
588
County
Arapahoe
Jefferson
Community
Littleton
Stream Name
Massey Draw and SJCD (South)
Title
FHAD - Massey Draw and SJCD (South)
Date
12/1/2005
Prepared For
Urban Drainage and Flood Control District, Jefferson County, Littleton
Prepared By
Olsson Associates
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br /> <br />I <br /> <br /> <br />3-3 <br /> <br />I <br /> <br />I <br /> <br />,"Y <br /> <br />I <br /> <br />(I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />(I <br /> <br />I <br /> <br />I <br /> <br />Figure A-13 shows the modified baseline model peak flow versus location (station) for the main <br />Massey Draw channel and the North Tributary of Massey Draw for the 10, 50, 100-, and 500-year <br />storm events, In the graph of the main channel, the upstream reach of Massey Draw was considered <br />to be conveyance element 237, just west of the hogback. This point is downstream of two detention <br />basins and the confluence of several tributaries that convey drainage from the upper portion of the <br />watershed, Figure A-14 shows the peak flow versus station for the main channel, North Tributary, and <br />Tributary No, 1 and Tributary No, 2 of SJCD (South), <br /> <br />I <br /> <br />Figures A-10 through A-12 in Appendix A show modified baseline model hydrographs generated by <br />UDSWM for the 1 OO-year storm at select locations for Massey Draw, SJCD (South), and their <br />tributaries. <br /> <br />'I <br /> <br />Table A-5 in Appendix A presents modified baseline peak flows for all of the UDSWM conveyance <br />elements in the Massey Draw and SJCD (South) models for the 10-, 50-, 100-, and 500-year storm <br />events. <br /> <br />I <br /> <br />I <br /> <br />The 100-year modified baseline model flows are included in Table 4. The effect of the existing <br />detention on Massey Draw is insignificant. The detention on SJCD (South) reduces the 1 OO-year flows <br />9 percent to 21 percent, with the most significant decrease immediately downstream of the detention. <br /> <br />,I <br /> <br />I <br /> <br /> <br />CIty (y' <br /> <br />Littleton <br /> <br /> <br />Flood Hazard Area Delineation <br />Massey Draw and SJCD (South) <br />December 2005 <br />
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