FLOOD02551

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: Consulting Services for Flodplain Study Review and Designation Program ‎(SOQ)‎
• Date: 4/7/2000
• Prepared For: State of Colorado
• Prepared By: ICON Engineering, Inc.
• Floodplain - Doc Type: Miscellaneous

Colorado. All of this effort culminated in a major drainageway masterplan. This massive
master planning effort was one of the largest ever undertaken for the Urban Drainage and
Flood Control District. Services included facility inventory, floodplain and flood hazard
delineation, damage evaluation, development of 160 distinct improvement alternatives in 44
reaches along 27 miles of channel, and preliminary design of improvements in and adjacent to
Boulder, Colorado. Significant issues in the study included examination of multiple use
potential, removal of drainage from irrigation ditches, the development of financing plans, and
coordination of input from 10 city/county departments and numerous public groups.
Staff Assignments: Douglas Williams, P.E. - Project Manager
Client Reference: UD&FCD - Mr. Ben Urbonas [phone]

Flood Control and Drainage Prioritization Analysis, Sterling, Colorado: The primary
goal of this project was to address the community's flood and drainage problem areas in the
most cost effective and acceptable manner and to provide a workable floodplain management
program. This community has experienced serious flooding from the South Platte River and
two major tributaries. Work consisted of reviewing and compiling data from previous studies,
including FIS documentation. HEC-2 Models were developed for the 100- , 50-, and 10-year
events. A number of proposed improvements had been studied in past years. The new HEC-2
models were used as a tool to prioritize the recommendations. Alternatives studied in detail
included major regional detention dams, channel improvements" and design of portions of the
City's outfall system. This project was jointly funded by the City and the CWCB. Following
the disastrous July 1997 flood, ICON next produced the Pawnee Creek Flood Hazard
Mitigation Feasibility Study, Sterling, Colorado: Prepared jointly for the City of Sterling,
Logan County and the Colorado Water Conservation Board, this study served as the basis for
a Hazard Mitigation Grant Program application. This report summarized data related to the
1997 flood event that occurred on Pawnee Creek in Logan County, and the subsequent
overflows into the City of Sterling. A complete tabulation of data related to the flood was
made, including estimates of flood damage, peak flow rates, rainfall depths and area flooded.
Much of the information was compiled from data prepared by others and obtained, formatted
and presented by ICON. This application was reviewed and accepted by FEMA. The time
frame for the study was very restrictive due to tight scheduling requirements imposed by
FEMA. On the basis of the submittal, the application was successful in obtaining FEMA
money partially funding the project and design is currently underway.
Staff Assignments: Penn Gildersleeve, P.E. - Project Director
Matt Ursetta, P.E. - Project Engineer
Client Reference: City of Sterling - Mr. Joe Kiolbasa [phone]

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