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1986-12-18_REVISION - M1981302
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1986-12-18_REVISION - M1981302
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Entry Properties
Last modified
9/9/2022 3:50:58 PM
Creation date
11/21/2007 9:35:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1981302
IBM Index Class Name
Revision
Doc Date
12/18/1986
Doc Name
EVALUATION OF CERTAIN ENGINEERING STUDIES OF SOUTH BOULDER CREEK FROM UPSTREAM OF HWY 93 TO
From
TAGGART ENGINEERING ASSOCIATES INC
To
URBAN DRAINAGE AND FLOOD CONTROL DISTRICT
Type & Sequence
AM2
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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rJAGGART III IIIIIIIIIIIIIIII <br /> ENIGMER,HG A33= 12.:RG <br /> RW WW;Em•venue e3wazo acS'1 •!OG]f+7a•71GG•FUt 011i:aa•iYn 999 <br /> December 18, 1986 <br /> Mr. Bill DeGroot <br /> Chief, Floodplain Management <br /> Urban Drainage and Flood Control District <br /> 2480 West 26th Avenue, Suite 156E <br /> Denver, CO 80211 <br /> RE: Evaluation of Certain Engineering Studies of Scuth Boulder Creak, From Upstream of <br /> Highway 93 to Downstream of South Boulder Road, Phase I <br /> Dear Mr. DeGroot: <br /> We have reviewed the ;:cod Hezere Delineation IF4AO) - Scut)+ 9culder Croak- Greenhorns <br /> and O'Mara (G&O), July 198E for the Urban Drainage ano Flood Control District ?UDFCO), <br /> and Boulder Counr/ !County); and the fl^odolaic Anelvsis of Scu•h RQuIdar Creek At the <br /> Fletirona P•e arty in eeulder Cnuntv, Love & Associates, Inc. (Lovel, 1995. Our evaluation <br /> was to determine which of these two studies was more appropriate to use, with or without <br /> modification, for South Boulder Creek floodplain.management efforts in the reach from <br /> upstream of State Highway 93 to just below South Boulder Road. <br /> For the purposes of cur analysis, the 100•year stern hydrology, originally prepared by the <br /> U.S. Army Corps of Engineers (Corps) and used in the G&O FHAD was assumed. We <br /> obtained a copy of the Corps' mocei and were able to determine a more derailed distribution <br /> of the flow front the tributaries, such as Viere and along the floodpiain. The hydraulic <br /> models used in our analysis were largely basso on current topographic conditions including <br /> the Fiatirons Pit area and levees. <br /> It is important to note that tf+a G&O and Love studies were done for different purposes. The <br /> G&O study was a general floodplain delineation study of South Boulder Creek from the C&S <br /> Railroad upstream into the canyon. The Love study was intended to identify conservative <br /> flood hazards associated with the Flatirons gravel mining property, as a pert of due diligence <br /> invest;gatlons initiated by the University of Colorado (CUI. Most of Love's effort focused <br /> on the shor, reach from the upstream side of the Flatiron's Levee to Highway 36. <br /> The Love study identified a spill from South Boulder Creek that could overflow U.S. 36 into <br /> existing neighborhoods on the west side of the South Boulder Valley. Previous studies <br /> (G&C, R.W. Beck, Corps of Engineers) reflected the potential for this, but did not include any <br /> details on flows, probabilities, areas of flooding, and the potential hazards. <br /> BACKGROUND <br /> Prior studies don't adequately explain the hazards of the changing alluvial floodpiain. South <br /> Boulder Creek historically created an alluvial fan .forming a wide valley bottom over a mile <br /> Mvamwpr • • fw".MeAl TV.SCtlR <br /> C.v.. RQQC :;MM.. Wma' evl Wr.w$W9y WC Pam& <br /> F.r., ,vY M4�t•e^ • 1.,1.14C SwvCN <br /> WMI <br /> EXHIBIT NO.15 <br />
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