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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 /> , , <br /> ,-::w,--, <br />I .- <br /> <br />1.0 <br />INTRODUCTION <br /> <br />1.1 PROJECT DESCRIPTION <br /> <br />1.1.1 General <br /> <br />Beaver ReservDir is IDcated approximately 9 miles sDutheastDf 'Paf!nia, CDIDradD as <br />shDwn Dn Figure 1-1. It is Dwned and Dperated by the Beaver'ReservDir CDmpany <br />(BRC) which is held in turn by the MinnesDta Canal and ReservDir CDmpany, the <br />Turner Ditch CDmpany, and the Lone Cabin Ditch and ReservDir CDmpany. The <br />reservDir is used to. stDre and regulate release Df water fDr irrigatiDn Df abDut 3,400 acres <br />Df agricultural land in the PaDnia area. <br /> <br />The reservDir is impDunded by a zDned _e~rthfill emliimkment cDnstructed across a <br />narrow, steep-walled stretch Df the East-FDrk DL~innesDta Creek. The embankment <br />is ShDwn in plan and sectiDn Dn Figure 1-2, Dbtained from the design drawing files Df the <br />CDIDradD DivisiDn Df WatecResDurces (DWR). The embankment is 113 feet high at <br />the maximum sectiDn arid.870 feet lDng. ReservDir stDrage capacity is 1,600 acre-feet. <br />A steel Dutlet pipe with' cDncrete,iniet"at the mid-valley sectiDn is used fDr cDntrolled <br />releases from the reservDir. UncDntrolled releases DCCur through the Dpen channel <br />spillway in the right abl!unent. <br />, / ---, '" <br />. ' <br />Since cDnstruction,Beaver ReservDir has had a histDry Df sinkhDle develDpment in the <br />reservDir floDr near the embankment. SinkhDle repairs, cDnsisting primarily Df <br />backfilling and capping with clay, have often been effective in the shDrt-term, but have <br />nDt prevenfed the develDpment Df new sinkhDles and the eventual appearance Df DId <br />sinkhDles. In response to' the mDSt recent round Df Dbserved sinkhDle activity in 1992, <br />the dam has been placed Dn restricted stDrage by the DWR, Office Df the State <br />Engineer. This repDrt evaluates remedial alternatives and presents a preliminary <br />remedial design fDr the preferred alternative which addresses the dam safety issues <br />raised by the Office Df the State Engineer. The repDrt also. includes a cDnstructiDn CDst <br />estimate and a financial program for the repair work. <br /> <br />23067/Rl.l 09-03.93(9:34am)/RPT <br /> <br />1-1 <br />