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<br />TABLE I-1
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<br />BENEFIT/COST DATA FOR THE RECOMMENDED PLAN
<br />DIRECT FLOW AREA 0054
<br />
<br /> 1 2 3 4 5 6 7 8 9 lO 11 12 l3 l4
<br />Alt. Description Des Construction Costs Total Annual Annual Total Ann.1 Residual Annual Net Total B/C
<br /> Freq. Channel Street Utility Contingency R.O.W. Const. Const. 0& M Improvements Flood Benefit Annual Annual Ratio
<br /> Improvement Crossings Relocation 25% Acquisition Costs Costs Costs I Damage Benefit Costs
<br /> I
<br /> Existing Condition 8,lOO 8,ldo 123,600 0 -8,lOO l3l,700
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<br />1 & 2 Adams County
<br /> and
<br />3 City of Thornton
<br /> Enlarge E. 112th Ave.
<br /> pond to 22 A.F., en-
<br /> large Upper Medema
<br /> to l6 A.F., Lower
<br /> Medema to remain in
<br /> existing condition, im-
<br /> prove outlet works of
<br /> all ponds. Improve !
<br /> downstream channel; 22,lL
<br /> Reach 1 -
<br /> Grasslined 2 l79,000 0 0 45,000 34,000 258,000 l8,400 3,700 6,600 29,900
<br /> Reach 2 - 4,000
<br /> Grasslined 2* 23,000 8,000 4,000 9,000 5,000 49,000 3,500 500 1,300 8,600
<br /> Reach 3 - Concrete ]
<br /> lined lOO l32,000 0 0 33,000 0 l65,000 11,800 300 l2,1@0 0 27,700
<br /> Detention ponds lOO 245,000 89,000 6,000 85,000 l09,000 534,000 38,ioO 8,600 46,700
<br /> 579,000 97,000 lO,OOO l72,OOO 148,000 l,006,000 71,800 13,lOO 84,900 7,900 66,lOO -l8,800 92,800 .78
<br />
<br />4
<br />
<br />City of Thornton
<br />Enlarge drainage cul-
<br />vert and inlet at E.
<br />112th Way cul-de-sac.
<br />Construct grass-
<br />lined channel from
<br />Cherry Drive to E.
<br />112th Ave. lO
<br />
<br />l04,000
<br />
<br />6,000
<br />
<br />o
<br />
<br />27,000
<br />
<br />39,000 170,000 l2,lOO 8,500
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<br />20,600
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<br />36,700 l2,900 -7,700 57,300
<br />
<br />.63
<br />
<br />683,000 l03,000
<br />
<br />lO,OOO
<br />
<br />199,000
<br />
<br />187,000 l,l76,000 83,900 2l,600
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<br />105T
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<br />. 44,600 79,000 -26,500 l50,100
<br />
<br />.75
<br />
<br />TOTAL PLAN BENEFIT/COST
<br />
<br />*Crossing at Riverdale Road Designed for lO-Year Event.
<br />
<br />1-5
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