FLOOD00644

• County: Logan
• Community: Sterling
• Title: Flood Control and Drainage Prioritization Analyses - Sterling and Vicinity
• Date: 11/8/1995
• Prepared For: Sterling
• Prepared By: Lidstone & Anderson, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Christopher L. Doherty
Water Resource Engineer

Mr. Doherty is a water resources engineer for Lidstone & Anderson, Inc. (LA). Mr.
Doherty has experience in urban and rural hydrologic analyses for both local design and regional
planning. He also has experience in the evaluation and design of hydraulic structures and
systems. He has participated in field data collection and existing system inventory.
Mr. Doherty's experience includes the use of the U.S. Army Corps of Engineers Flood
Hydrograph Package (HEC-I), Water Surface Profiles Program (HEC-2) and River Analysis
System (HEC-RAS) for the development of on-site hydrology and hydraulic analysis in support
of numerous projects. These have included natural river systems as well as drainage channels
and detention facilities. Mr. Doherty is also experienced and proficient in the use of the
Colorado Urban Hydrograph Procedure (CUHP), the EPA's Stormwater Management Model
(SWMM), and the Federal Highway Administration's HY-8 culvert analysis model.
Descriptions of typical projects are listed below.

. Project engineer for the development of both a Master Drainage Plan and Final Drainage
Plan for the Centerport International Development near the Front Range Airport in
Adams County, Colorado. Mr. Doherty was responsible for all related hydrologic and
hydraulic analyses, and the evaluation and preliminary design of hydraulic structures for
the 7.7 square mile development, which required extensive use of both hydrologic and
hydraulic computer modeling. In conjunction with this, Mr. Doherty conducted detailed
hydrologic analyses using both the CUHP and SWMM models. He also performed
analyses of existing hydraulic structures as well as the design of storm water drainage
channels, detention facilities and the hydraulic design of flood control structures.

. Project engineer for the amendment to the Fossil Creek Master Plan for both Fossil
Creek and Stanton Creek upstream of the Union Pacific Railroad (UPRR) in Fort
Collins. Mr. Doherty modified the Fossil Creek Master Plan SWMM analysis based on
existing and anticipated changes in land use and channel improvements within the
drainage basin. The SWMM analysis also included a reanalysis of the detention area
between the UPRR and Trilby Road. He then modified the Master Plan HEC-2 analysis
based on current hydrology and delineated the loo-year floodplain to reflect the changes
in water surface elevation.

. Project engineer for revisions to the hydrologic analysis for the upper 3300 acres of the
Spring Creek basin in Fort Collins. In the process of developing a revised Master Plan
SWMM model, Mr. Doherty combined applicable portions of three existing models and
revised subbasin boundaries and runoff parameters to reflect current drainage patterns.
In addition, he developed storage-outflow rating curves for ten local and/or regional
detention ponds within the basin. Project engineer for the hydraulic design of channel
improvements and two bridge crossings of Spring Creek near Drake Road in Fort
Collins. Incorporating the results of the revised Master Plan hydrology, Mr. Doherty
used the HEC-RAS model to perform the hydraulic analysis for channel improvements
along a 1600 foot reach of the creek.

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