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Last modified
1/26/2010 10:08:01 AM
Creation date
10/5/2006 4:04:55 AM
Metadata
Fields
Template:
Floodplain Documents
County
Logan
Community
Sterling
Basin
South Patte
Title
Sterling Flood Control Interceptor Channel Project
Date
4/1/2002
Prepared For
Sterling
Prepared By
URS
Floodplain - Doc Type
Project
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />SEm'.ONE <br /> <br />lnuoduction <br /> <br />1.1 BACKGROUND <br /> <br />During the week of July 28, 1997, heavy rainfall in eastern Colorado, including the Pawnee <br />Creek watershed, saturated agricultural and range lands. The heavy rains caused significant <br />flooding in the communities of Fort Collins, Weldona, Atwood, and Sterling. Point rainfall <br />amounts of up to IS inches in a 4- to 8-hour time period were reported in the upper watershed <br />areas of Pawnee Creek. On August 1, 1997, President Clinton declared a major disaster in the <br />state of Colorado as a result of severe storms, heavy rains, flooding, mudslides, landslides, and <br />severe ground saturation. Three counties were initially declared eligible for Individual <br />Assistance, Public Assistance, and Hazard Mitigation Assistance, and lO more counties were <br />subsequently added. The incident period was from July 28, 1997 through August 12, 1997. This <br />designation allows federal assistance funds to be used to minimize future flood hazard and the <br />cost of future damage. A substantial portion of the federal financial assistance is provided by <br />Federal Emergency Management Agency (FEMA) pursuant to the authority ofthe Robert T. <br />Stafford Disaster Relief and Emergency Assistance Act, Public Law 93-288, as amended. <br /> <br />The City of Sterling (Sterling), located in eastern Colorado (Exhibit 1), has applied to the State <br />of Colorado for funding through the FEMA Hazard Mitigation Grant Program (HMGP) for <br />assistance under Presidential Disaster FEMA-1186-DR-CO. This assistance would be used to <br />reduce the potential for future flood damage as a result of flooding along Pawnee Creek. The <br />Council on Environmental Quality (CEQ) has developed regulations to implement the National <br />Environmental Policy Act (NEP A). These regulations are set forth in Title 40, Code of the <br />Federal Regulations (CFR) Parts 1500-1508, and require an investigation of the potential <br />environmental impacts of a proposed federal action, and an evaluation of alternatives as part of <br />the environmental assessment process. The FEMA regulations that establish agency-specific <br />process for implementing NEP A are set forth in 44 CFR Subpart 10. This Environmental <br />Assessment (EA) was conducted in accordance with both FEMA and CEQ NEP A regulations. <br /> <br />1.2 HISTORY <br /> <br />Pawnee Creek is a left-bank tributary to the South Platte River and drains an area of about <br />645 square miles. The mouth of the creek is located about 5 miles southwest of Sterling and <br />about 1 mile northeast of the Town of Atwood (Atwood) in Logan County. The South Platte <br />River floodplain is broad and relatively flat. The channel capacity of Pawnee Creek within the <br />project area is quite small, less than 1,850 cubic feet per second (cfs), when compared to flows in <br />excess of 30,000 cfs that can be generated in the lower basin during major precipitation events. <br />Presently, overbank flows of Pawnee Creek are prevented from flowing to the South Platte River <br />by embankments of Highway 6 and the Union Pacific Railroad (UPRR) track. The <br />embankments, which are located on the riverside of both towns, contribute to ponding of <br />floodwaters in Atwood and surrounding areas and directing the overflow into Sterling. <br /> <br />Major flood events on Pawnee Creek have occurred in 1935, 1965, and 1997. The worst flood, <br />which occurred in 1997, was estimated to be greater than a 100-year flood event in the upper <br />portion of the basin and less than a I aD-year flood event in the lower portion of the basin. <br />Damage from the 1997 flood was estimated at $19 million within Logan County (ICON 1998). <br /> <br />1-1 <br />
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