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<br />".JLQ, WATC::R
<br />GNlSi:RVATION BOARQ
<br />
<br />
<br />HYDRO-TRIAD, LT'O.
<br />November 14, 1978
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<br />
<br />Mr. Bill Stanton
<br />Colorado Water Conservation
<br />1313 Sherman Street
<br />Denver, CO 80203
<br />
<br />~ Dear Bill:
<br />
<br />~
<br />
<br />Board
<br />
<br />Regarding our flood plain definition contract with the eWCB and
<br />~ Montrose, enclosed please find the following:
<br />!II
<br />
<br />r
<br />
<br />a) Revised crossing rating calculation for Montrose Arroyo at So.
<br />1st Street in Montrose. The discrepancies between the mapping
<br />contour data and digitized data resulted in the adjustment to this
<br />initialization rating. The crossing initializations are now based
<br />on the digitized data, consistent with the backwater calculations.
<br />
<br />...
<br />
<br />I
<br />.~
<br />
<br />b) Sununary computer printouts for the reaches re-analyzed due to
<br />the initialization revisions. With the exception of the re-initiali-
<br />zation calculation discussed in a) above, all re"initialization
<br />calculations' have been previously sent to the eWCB. The computer
<br />printouts in the Hydraulics Addendum, however, did not refle,:t the
<br />re-initialization. The re-initialized sununary computer printouts
<br />are therefore enclosed. As can be see,n from this information, the
<br />impact on the backwater profile of the re-initialization is usually
<br />damped out within the first few sections.
<br />
<br />r
<br />
<br />r
<br />
<br />,
<br />
<br />c) Copies of the worksheet profiles in the area of reV:LS:Lons illustrating
<br />the revised water surface. Due to the incised nature of the channel,
<br />alteration to the flood plain shown on the mapping is not significant.
<br />
<br />,
<br />
<br />d) Mapping in the vicinity of the confluence of Dry Cedar Creek with
<br />the Uncompahgre River. This reach was extended downstream in accordance
<br />with our telephone discussions.
<br />
<br />I
<br />
<br />Please review this information in conjunction with the data already
<br />j'urnished. We look forward to receiving your comments.
<br />
<br />Sincerely,
<br />
<br />,
<br />.
<br />
<br />I
<br />
<br />WBM(jh
<br />Bl1cls.
<br />c,; : Mr. Mike Serra
<br />
<br />HYDRO-TRIAD, LTD. ,-L.
<br />
<br />Q7~~r--'
<br />
<br />William B. Mathews .
<br />Water Resource Engineer
<br />
<br />751J0 W. MISSISSIPPI AVE, ' SUITE 10
<br />
<br />LAKEWOOD. COLOHADO 80226
<br />
<br />PHONE 303,934,2477
<br />
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