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<br />Acknowledqements
<br />A Technical Committee was established for this project to review the
<br />progress of tile Study and to provide technical input for the sponsoring
<br />agencies. The Technical Committee included the following individuals:
<br />Mr. LarryF. Lang, Colorado Water Conservation Board
<br />Mr. D. Randolph Seaholm, COlorado Water Conservation Board
<br />Mr. Ali lzadian, Director of Public Works, City of Sterling
<br />Mr. Joseph Kiolbasa, Build1ng Inspector, City of Sterling
<br />Resource Consultants, Inc., Ft. Collins, Colorado, perfonnedt he
<br />hydraulic analysis for this study. Personnel directly involved in the
<br />project were: Or. E.BruceJones, P.E.,Mr.DavidFrick,P.E.,andM r.
<br />Paul Barker. Also making significant contributions were Mr. Marvin McElwain,
<br />City Manager, Mr. Thomas Reaghard, City Planner, Mr, E.L. Bennett, P.E.,
<br />and Mr. Raymond McClanahan. The assistance and cooperation of the TeChnical
<br />Committee, Resource Consultants, Inc., and these individuals during the
<br />course of the study are acknowledged and greatly appreciated.
<br />The assistance and cooperation in supplying information and data of
<br />the agencies and organizations listed below are also appreciated and
<br />gratefully aCknowledged:
<br />U.S. Ammy, Corps of Engineers
<br />USDA Soil Conservation Service
<br />Lower South Platte Water Conservancy District
<br />ColoradO Water Conservation Board
<br />CityofSterlinq
<br />Logan. County.
<br />
<br />RelatedStudtes
<br />Several studies have been conducted for Logan County and the City of
<br />Sterling. "Flood Plain Information: South Platte River and Pawnee Creek,
<br />Sterling,Colorado.' prepared by the U.S. Army Corps of Eng1neers (1978)
<br />Omaha District made pre1iminary determinationsof the extent of flo odingin
<br />Sterling from Pawnee Creek overflows 1n addition to the detailed analysis of
<br />flooding caused by the South Platte River. E.L. Bennett, P.E., a local
<br />consulting engineer ~ade studies of Pawnee Creek floods. His work though
<br />unpublished is on file with the Director of Public Works. Additional un-
<br />published studies by the U.S. A~ Corps of Engineers-Omaha District also
<br />provided information for this report. Finally, Hoskins and Associates (1.957)
<br />developed a master drainage plan for the City. This report is a1so on fi1e
<br />with the Director of Public Works.
<br />The results of this study reflect information from all the above sources.
<br />However, for purposes of flOOdplain management, the detailed results herein
<br />will supersede information previously developed by Mr. Bennett and Corps
<br />of Engineers for Pawnee Creek only. Corps infonnation on the South Platte
<br />River remains unchanged. The flood plain information developed in this
<br />report for Sand Creek is new work.
<br />
<br />Colorado Water Conservation Board
<br />823 Centennial Building
<br />1313 Sherman Street
<br />Denver,Colorado 80203
<br />
<br />MapplnQ and Survey1nq
<br />Top09raphic mapping of the stu~ area was prepared using photogrammetrlc
<br />methods by Blevins ~pping Co., Denver, Colorado, 1976 and Landmark Mapping,
<br />Lakewood,Colorado, 1981. Map scale is 1"=200' with tNo-foo.tcontour intervals.
<br />Field surveys were completed with assistance from the City Engineer to
<br />supplement the topographic mapping as required. Spot elevations were taken
<br />at 1ocationswhere elevations were critical tothehydrau1iccomputat1ons. In
<br />general,fieldlnformationwasconslstentw1ththetopographicmapp1ng.
<br />Field surveys provided additional physical details necessary for computer
<br />modeling. 7hese included hydraUlic roughness coefficients, channel dimensions,
<br />~nrl "n "rcnuntin~ of dr"ina~~ ~tructur~. and th~i~ ~tat~ Of ~er";r.
<br />Major drainage basins were determined from u.S. Geological Survey 1:24,000
<br />scale maps. Subcatchments within the larger drainage areas were also
<br />delineated based on these maps.
<br />Permanent reference monuments were established in the field based on
<br />U.S. Coast and Geodetic Survey mean sea level datum to aid in transferring
<br />data in this report to actual ground conditions. A summary of these monuments
<br />is contained in Table 21. Elevations of vertical control points for the
<br />aertal photography and mapping are on file with the Director of Public workS.
<br />
<br />Report AcquiSition
<br />Copies of this report are available for public distribution, for a
<br />nominal fee, at the offices listed below. A Tecnnical Addendum to this
<br />report is also available for reviex at the sa~e off~ces; however, it has
<br />not been publiShed in sufficient ouantities for public distrib ution.
<br />Director of Public Works
<br />City of Sterling
<br />Centennial Square
<br />Sterling, Colorado 80751
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