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Last modified
8/16/2009 2:53:46 PM
Creation date
10/4/2006 6:43:45 AM
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Board Meetings
Board Meeting Date
5/19/2003
Description
Flood Secton - Meeting Summary
Board Meetings - Doc Type
Memo
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<br /> <br />and it was determined that they don't last well through a winter so it is advisable to check and or replace them in <br />Glenwood Springs and the Durango area. Other CWCB activities include packaging flood deals. The CWCB <br />has worked with the Corps and the USGS on emergency activities. The CWCB has the contact base and <br />specializes in packaging deals related to flood projects, The CWCB does aerial mapping, flood <br />documentation, and floodplain mapping. The CWCB also does floodplain identification and floodplain <br />delineations. The meeting minutes and forecasts by NRCS and HDR engineering are posted on the CWCB <br />website in the flood protection section at htto://cwcb.state.co.us/flood watchlindex.html#flow <br /> <br />e <br /> <br /> <br />-4- <br /> <br />FEDERAL AGENCY REPORTS <br /> <br />U.S. Geological Survey - Mark Smith <br />The USGS has been looking at post wildfire season flood hazards and delineating the floodplains. <br />The USGS has been working with FEMA, the Corps, the Bureau of Reclamation, the CWCB and local <br />agencies in response to the fires. Once fire season started in 2002 they developed an inventory of fires <br />statewide. They looked at 16 burn areas in July 2002 to develop a preliminary category and study based on <br />hazards to life and property. The USGS narrowed the hazards down to three fires: Hayman, COl;ll Seam, and <br />Missionary Ridge. They began collecting data and creating models for 100-year flooding and debris flow <br />potential. In August 2002 they generated preliminary hazard maps potential 100-year flood reflecting post <br />fire conditions. They have produced a rainfall run off HEC model and calibrated it to natural conditions with <br />historic streamflow data. They then adjusted model parameters with bulking factor adjustment for sediment <br />content. So far this model is primarily on the South Platte basin. This analysis incorporates 112 watersheds <br />in fire areas including upstream of Cheeseman Reservoir and downstream. They have surveyed cross sections. <br />An analysis of a 100-year flood shows increases in the South Platte flows of up to 3-4 times. We could see <br />flows in 16,000-18,000 cubic feet/second range if Cheeseman is full. Cheeseman would hold the flood now <br />as the reservoir levels are low. <br />Coal Seam Fire (Glenwood Springs) - The USGS sees flood and debris flow problems. They are e <br />analyzing 23 basins by a geo-morphologist. The USGS will have preliminary maps this month, They have <br />used a FLOW2D flood model. There will be more detailed mapping coming. The major concern is Mitchell <br />Creek in Glenwood springs. There should be final map products for flood conditions on Mitchell Creek in <br />June 2003. <br />Missionary Ridge major problem is debris flows. There are 23 basins that are small watersheds. The <br />USGS is modeling some ofthose but not all ofthem and they key ones will be mapped also. Information and <br />maps are available on the USGS Geo-Mac website at httn://l!eomac.uslZs.lZov/ . It is possible to see runoff <br />discharge numbers that are 5-40 times normal. . <br /> <br />Natural Resources Conservation Service - Harry Smitb <br />The NRCS has an Emergency Watershed Protection Program that is cost shares 25% local and 75% federal. <br />This program can be activated after an event and doesn't need a national disaster declaration. EWP sponsors <br />raise dollars and need to cover the operations and maintenance of features. They have allocation or <br />reimbursement of funds after the fact. NRCS was very bU8Y after the fires of 2002 and the Fountain Creek <br />Flood of 1999 and the South Platte River flooding in 1995. Typically the NRCS works with the USFS right <br />after floods and fires. In 2002, they were Involved with the USFS BAER team reports in 2002. The NRCS <br />helped at the Coal Seam Fire on Mitchell Creek and the state fish hatchery. They are set up to work with local <br />governments. Local governments have 60 days after the fire or flood event to get the request for assistance in <br />to the NRCS. Local governments are encouraged to work with county level NRCS offices firSt. After <br />agreements are in place the NRCS has 220 days to get going, get the work done and get the fmal report in. <br />This program is designed to protect life and property but its up to landowners to maintain improvements. <br />Harry Smith noted that Douglas County, Teller County and Park County landowners took it on their own to <br />put seed on the ground and start to rejuvenate the watershed, The NRCS can provide emergency assistance <br />under two separate programs. They are the Emergency Watershed Program (EWP) and the Emergency A <br />Conservation Program. All applications for assistance must meet the following general guidelines: Applications - <br />must be submitted within 60 days of the flood event and the project must have a local sponsor. The project must <br /> <br />Flood Protection ? Water Project Planning and Finance? Stream and Lake Protection 4 <br />Water Supply Protection? Conservation Planning <br />
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