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<br />The ~ike system would prevent flood flows from reaching the
<br />Riverside Cemetery along with the associated overflow into
<br />Sterling and across the highway and railroad in that vicinity.
<br />An additional 2900 ef5, above present conditions, would be forced
<br />through the Pawnee Creek highway and railroad bridges (100 yr).
<br />Approximately 1400 cis would overflow the highway and railroad in
<br />this vicinity that would not occur under present conditions.
<br />There would be an increase in water surface elevation of about
<br />3.1 tt at the Pawnee Creek bridge. An increase of 340 cis from
<br />present conditions would overflow the highway and railroad near
<br />Atwood. This would raise the water surface elevation across the
<br />railroad near Atwood by very little.
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<br />This dike system would benefit the Town of Sterling; however, it
<br />should he understood that a tradeoff would be additional flood
<br />water discharge and depth along the lower reach of Pawnee Creek
<br />to Atwood.
<br />
<br />Pawnee Creek Watershed - Oike System Cost
<br />
<br />---------------------------------------------------------------
<br />Location Volume Const Eog proj Land Total 0'"
<br /> Fill Cost Cost Admin Right In"t",] il
<br /> c, $ $ $ $ $ $
<br />---------------------------------------------------------------
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<br />West Dike 14500 70300 9850 11950 12000 104100 ;00
<br /> V II
<br />East Dike 15960 557040 78040 94790 12000 741870 6250
<br />South Dike 3374 12680 1770 2150 5000 21600 '00
<br /> '1
<br />Total 33834 640020 89660 108890 29000 867570 7150
<br />---------------------------------------------------------------
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<br />~I Includes $16000 for 4 irrigation conduits under the dike
<br />,I Includes 15340 cu yd earthfill and 620 cu yd of reinforced
<br />concrete
<br />11 Includes $5800 for irrigation conduit, $435240 for concrete
<br />wall and $58500 for special structure at highway and railroad
<br />if O&M (annual cost assumed to be) 1 percent of construction cost
<br />2f Includes 620 cu yd of reinforced concrete
<br />Note: Rock rip rap may be needed along the downstream railroad
<br />slope at certain locations. Costs for this are not included
<br />here.
<br />
<br />Further project studies will be needed to evaluate economic
<br />feasibility and project effects if this dike system were to be
<br />pursued.
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