<br />Sterling, It involves a major diversion channel plus new bridges/culverts on the south side of Sterling that
<br />will route floodwaters from the Pawnee Creek overflow back to the South Platte River. The estimated
<br />construction cost of the project is approximately $4 million, part of which will be funded by a loan from the
<br />Construction Fund, Other funding sources include the Federal Emergency Management Agency and the City
<br />of Sterling, however there may be a shortfall of funds due to an increased project cost estimate since the time
<br />of the original estimate that was prepared several years ago, The City will be addressing this funding
<br />shortfall in the most practical manner, which mayor may not include an additional loan from the CWCB,
<br />
<br />Joe Kiolbasa, acting City Manager and Public Works Director for Sterling, has been instrumental in
<br />coordinating activities related to this project. Mr. Kiolbasa has been invited to attend the meeting so Board
<br />members may have a chance to meet him and ask any questions they may have regarding flooding issues in
<br />Sterling,
<br />
<br />Cherry Creek PMP Study: On May 8 the Cheny Creek Study Team met at Urban Drainage and Flood
<br />Control District Offices for the second to the last meeting, Interim Report # 1 has been revised according to
<br />the Technical Review Panel's (TRP) comments and sent to the National Weather Service for review, Interim
<br />Report # 2 will be sent out the TRP and the NWS on May 17 and revised after comments, A draft final report
<br />is due in mid-June and the Draft Final Report and [mal project meeting is scheduled for July 2, Flood Section
<br />staff are confident that the best science available was used to calculate the PMP values and hopes to come to
<br />resolution with the NWS, At that time we will tum over the Report [mdings to the Corps of Engineers to
<br />route the numbers and create a "Probable Maximum Flood" Study,
<br />
<br />A status update of completed tasks is: the review ofthe original 1995 National Weather Service Study, the
<br />reproduction ofNWS procedures and calculations, sensitivity analysis of variables which influence PMP
<br />values, extreme storm identification and analyses, comparison between the Applied Weather Associates
<br />approach and the NWS approach, acquire and verify the use of the original GRASS GIS software, the review
<br />of policies related to antecedent rainfall and floods criteria, What tasks are remaining are: reasonableness
<br />and consistency checks, final paleo-flood analysis, and the two [mal reports, Although there are issues
<br />remaining to be resolved the CWCB is happy with the progress ofthe study and hopes to have an
<br />information presentation to the board at the July meeting,
<br />
<br />Chatfield Reservoir PMP Study: The goal of the study is to carve out the maximum amount of storage
<br />space from flood control and make the water available to water users, There will be an expensive one time
<br />cost of mitigating impacts to wildlife and State Parks facilities, We must work to minimize large fluctuations
<br />in reservoir levels because this state park is very profitable because of high visitation and boasts one of the
<br />state's best bass fisheries,
<br />
<br />The CWCB's contractor for the Water Rights Investigation Study is Brown and Caldwell. Brown and
<br />Caldwell have assembled the water users into a Water Supply Committee, Although Denver Water has the
<br />most senior water rights, the other water users that have expressed interest in the reallocated space are:
<br />Central Colorado WCD, Littleton, Castle Rock, Glendale, Greenway Foundation, Aurora Centennial Water
<br />and Sanitation District, Division of wildlife,
<br />
<br />On April 29 CWCB staff, Denver Water and Brown and Caldwell met regarding the study and the came up
<br />with the following conclusions, The flood control study will assume all of the conservation pools are full as
<br />an initial condition, The water study will be used to determine the effects on recreation, wildlife, etc, There
<br />will be two phases of the water study: Phase 1: (1) get approval from the Army Corps of Engineers to
<br />reallocate x acre-feet from flood control to water conservation storage, (2) Determine the impacts on
<br />recreation and look for enhancement opportunities, (3) identifY fatal flaws, Phase 2, will be assist with the
<br />actual allocation of the storage to specific entities, who gets what,
<br />
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