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<br />RONALD C McLAUGHLIN
<br />KENNETH R WRiGHT
<br />HALf 000 E. ERICKSON
<br />DOUGLAS T SOVERN
<br />WilLIAM C, TAGGART
<br />DAVID J LOVE
<br />ROBERT L. CARLEY
<br />JOHN T. McLANE
<br />RONALD 8. CLONINGER
<br />GENE A BURRELL
<br />JAMES 8. FLOOD
<br />WilLIAM KENDALL
<br />MICHAEL E. MERCER
<br />JIMMIE 0 WHITFIELD
<br />ROBERT A FERGUSON
<br />J HAROLD ROBERTS
<br />JACK W. STEINMEYER
<br />LEANDER L URMY
<br />Mr. Ben Urbonas, P. E.
<br />Chief, Master Planning Program
<br />Urban Drainage and Flood Control District
<br />Suite 156-B
<br />248D West 26th Avenue
<br />Denver, Colorado 80211
<br />
<br />WRIGHT-MCLAUGHLIN ENGINEERS
<br />ENGINEERING CONSULTANTS
<br />
<br />COMPLETE ENGINEERING SERVICES
<br />IN THE SPECIALTY FIELDS OF
<br />
<br />2420 ALCOtT STREET
<br />DENVER, COLORA.DO 8021 1
<br />(303) 458-6201
<br />
<br />WATER SUPPLY AND DISTRIBUTION
<br />WATER AND SEWAGF TREATMENT
<br />SEWAGE COli ECTION AND REUSE
<br />STORM DRAINAGE
<br />FIRE PROTECTION
<br />fLOOD CONTROl
<br />OTHER WATER-ORIENTED PROJECTS
<br />
<br />Final design and construction of channel improvements adjacent to the mobile
<br />home park should be undertaken next to reduce flood hazard in that area.
<br />Flow separation structures at irrigation ditches, and street crossing
<br />improvements follow as third and fourth priority items.
<br />
<br />December 31, 1979
<br />
<br />Re: Direct Flow Area 3207
<br />Major Drainageway Plan
<br />
<br />As the remainder of the drainage basin becomes developed, it is recol1JT1ended
<br />that the criteria contained in Appendix C of this report be utilized, so that
<br />the benefits of the recommended improvements are maintained and the effi-
<br />ciency of the major drainage system is insured.
<br />
<br />We would 1 ike to thank you for your continuin9 cooperation and support
<br />throughout this project. In addition we are grateful to Mr. Mark Hunter,
<br />Mr. Jack Hibbert, and Mr. Dennis Wigert of the City of Broomfield and Mr. Tom
<br />Small of the City of Westminster for their assistance throughout this master
<br />planning effort.
<br />
<br />Dear Mr. Urbonas:
<br />
<br />Additional information and computations performed in the preparation of this
<br />report have been submitted to the Urban Drainage and Flood Control District.
<br />We are pleased with the completion of the Master Plan for Direct Flow Area
<br />3207 and look forward to its implementation.
<br />
<br />The following Phase B report comp letes Agreement Nos. 78-2.4 and 79-5.1,
<br />Major Drainageway Planning and Flood Hazard Area Delineation For Direct Flow
<br />Area 3207, dated April 21, 1978 and May 30, 1979, respectively.
<br />
<br />Planning for the 3207 has been accomplished in three phases. Drainage prob-
<br />lems were defined, and alternative solutions were presented in the Phase A
<br />report, publ ished in October, 1978. In June 1979, the "Flood Hazard Area
<br />Delineation - Broomfield Area" was published, and was subsequently adopted as
<br />the official regulatory flood mapping by the City of Broomfield and the Colo-
<br />rado Water Conservation Board. The third and final phase, exhibited in the
<br />attached report, was the development of a prel iminary plan for the 3207
<br />basin, based on the recommendations of the cities of Broomfield and Westmin-
<br />ster, and the Urban Drainage and Flood Control District.
<br />
<br />The selected plan combines a stormwater detention facility with improvements
<br />to roadway crossings, grass-lined and riprap channel improvements, regulation
<br />of the 100-year floodplain and residual 100-year floodplain, flow separation
<br />structures at irrigation ditches, and advocation of flood insurance.
<br />
<br />Plan and prOfile drawings have been prepared showing the location and extent
<br />of improvements. Accompanying each drawing is a description of the recom-
<br />mended improvements and the estimated construction costs.
<br />
<br />The projected total cost of the Major Drainageway Plan improvements is
<br />$2,089,285 which includes the costs, in 1979 dollars, for construction,
<br />en9ineering, contingencies, fiscal, legal, and administrative expenses. The
<br />total annual maintenance costs are estimated to be $10,820. A breakdown of
<br />these costs is presented with each of the plan and profile drawings.
<br />
<br />The highest construction priority should be established for the 5-year deten-
<br />tion facility upstream of Ash Street. This improvement offers the signifi-
<br />cant benefits of peak flow and flood damage reduction downstream.
<br />
<br />Very truly yours,
<br />
<br />WRIGHT-McLAUGHLIN ENGINEERS
<br />
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<br />
<br />By ~~tg~
<br />
<br />Project Manager
<br />
<br />BY~m,~
<br />t:/ ohn M. Pfl ,P.E.
<br />Project Engineer
<br />
<br />JMP : pr
<br />
<br />OFFICIAL COpy
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<br />
<br />COLORADO WinER CONSER'J:'JION BOARD
<br />823 STATE WlTENN:AL BUILDING
<br />1313 SHE~;r,:;~N STREET
<br />DENVER, CDLOEADO 80203
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<br />BRANCH OFFICES
<br />ASPEN
<br />0241 VENTNOR AVENUE
<br />ASPEN, COLORADO 81811
<br />
<br />DilLON LAKE
<br />DRAWER B
<br />FRISCO. COLORADO 80443
<br />
<br />GLENWOOD SPRINGS
<br />PO_ BOX 1286
<br />GLENWOOD SPRINGS
<br />GOLORAlJO 81601
<br />
<br />STf'AM80AT SPRINGS
<br />PO_ BOX 5220
<br />STEAMBOAT VILLAGl::
<br />COLORADO 80499 '
<br />
<br />CHEYENN[
<br />3228 LOCUST DRIVI::
<br />CHEYENNE, WYOMING 82001
<br />
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