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<br />TABLE 1-1
<br />
<br />BENEFIT/COST DATA FOR THE RECOMMENDED PLAN
<br />DIRECT FLOW AREA 0054
<br />
<br /> 1 2 3 4 5 6 7 8 9 10 11 12 13 14
<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 8,100 8,ldo 123,600 0 -8,100 131,700
<br /> I
<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 16 A.F., Lower
<br /> Medema to remain in
<br /> existing condition, im-
<br /> prove outlet works of
<br /> all ponds. Improve !
<br /> downstream channel; 22,110
<br /> Reach 1 -
<br /> Grasslined 2 179,000 0 0 45,000 34,000 258,000 18,400 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 100 132,000 0 0 33,000 0 165,000 11,800 300 12,1@0 0 27,700
<br /> Detention ponds 100 245,000 89,000 6,000 85,000 109,000 534,000 38,ioo 8,600 46,700
<br /> 579,000 97,000 10,000 172,000 148,000 1,006,000 71,800 13,100 84,900 7,900 66,100 -18,BOO 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. 10
<br />
<br />104,000
<br />
<br />6,000
<br />
<br />o
<br />
<br />27,000
<br />
<br />39,000 170,000 12,100 8,500
<br />
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<br />20,600
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<br />,
<br />
<br />36,700 12,900 -7,700 57,300
<br />
<br />.63
<br />
<br />683,000 103,000
<br />
<br />10,000
<br />
<br />199,000
<br />
<br />187,000 1,176,000 83,900 21,600
<br />
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<br />
<br />105T
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<br />
<br />. 44,600 79,000 -26,500 150,100
<br />
<br />.75
<br />
<br />TOTAL PLAN BENEFIT/COST
<br />
<br />*Crossing at Riverdale Road Designed for 10-Year Event.
<br />
<br />1-5
<br />
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