FLOOD03286

• County: Adams
• Community: Wheat Ridge, Arvada
• Stream Name: Lower Clear Creek
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 10/1/1981
• Prepared For: Adams County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE V-I V-3
I PHASE A
BENEFIT/COST COMPARISON
LOWER CLEAR CREEK
I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
.I\verage
I 50 Yr.B-l/4% 50 Yr.8-1/4% Annual Average {5~7+8) (10-11) (10/11) (9+11)
Annualized Annualized Annual Fl ood Annual Annual Annual 50 Yr.8-l/4% Benefi t/
Design Construction Construct ion R-O-W R-O-W 0&/1 Damage Damage Improvements Net Present Worth Cost Annual
I Reach Alternative Frequency Cost Cost Cost Cost Cost Cost Reductions Cost Benefit of Net 8enefit Ratio Cost
I Floodplain'Preserva~
tion 100 0 0 0 0 13,800 71,200 0 13,800 -13,800 -164,100 85,000
I Acquisition of Flood
Prone Properties 10 1,281,000 107,700 5,373,000 451,900 12,300 37,000 34,200 . '571,900 -537,700 -6,393,800 0.06 608,900
100 1,485,000 124,900 8,439,000 709,700 13,800 1,800 69,400 848,400 -779,000 -9,263,100 0.08 850,200
I Grass-Lined Channel 10 3,828,500 322,000 2,738,600 230,300 20,300 37,000 34,200 572,600 -538,400 -6,402,100 0.06 609,600
100 9,851,100 828,400 5,679,700 477 ,600 29,000 1,800 . 69 ,400 1,335,000 -1,265,600 -15,049,300 0.05 1,336,800
I Rock-Lined Channel 10 11,180,000 94D,200 883,400 74,300 21,100 37,000 34,200 1,035,600 -1, 001,400 -11,907,600 0.03 1,072,600
100 23,676,600 1,991,100 2,262,500 190,300 27,200 1,800 69,400 2,208,600 -2,139,200 -25,437,200 0.03 2,210,400
I Structural-Walled 10 13,032,500 1,096,000 619,800 52,100 17 ,6GJ 37,000 34,00 1.165,700 -1,131,500 -13,454,700 0.03 1.202,700
Channel 100 25,139,100 2,114,100 1,860,700 156,500 22,700 1.800 69,400 2,293,300 -2,223,900 -26,444,400 0.03 2,295,100
I IIA Floodplain Preserva-
tion 100 0 0 0 0 10,900 252,500 0 10,900 -10,900 -129,600 263,400
I Acquisition of Flood 10 50.000 4,200 7,885,000 663,100 9,400 192,000 60,500 676,700 -616,200 -7,327,200 0.09 868,700
Prone Properties 100 10,445,800 878,500 32,289,0002,715,400 10,900' 11,000 241,500 3,604,800 -3,363,300 -39,993,000 0.07 3,&15,800
Grass_Lined Channel 10 2,664,700 224,100 3,115,400 262,000 15,300 192,000 60,500 501,400 -440,900 -5,242,700 0.12 693,400
I 100 8,835,100 743,000 7,773,000 653,700 22,400 11,000 241,500 1,419,100 -1,177,600 -14,002,800 0.17 1,430,100
Rock_Lined Channel 10 8,024,900 674,900 685,600 57 ,700 15,600 19~,OOQ 60,500 748,200 -687,700 -8,177 ,400 0.08 940,200
I 100 19,482,800 1,638,400 2,768,600 232,800 21,300 11 ,000 241. 500 1, 892,500 -1,651,000 -19,632,000 0.13 1.903,500
Structural_Walled Channel 10 9,494,600 798,500 444,600 37,400 13,000 192,000 60,500 848,900 -788,400 -9,374,900 0.07 1,040,900
100 20,233,500 1,701,600 2,048,900 172,300 17,800 11,000 241,500 1,891,700 -1,650,200 -19,622,500 0.13 1,902,700
I Floodplain Preservation
with Structural Im- 100 8,920,300 750,200 3,145,100 264,500 12,600 15,700 236,800 1,027,300 -790,~00 -9,399,800 0.23 1,043,000
I provements-New Bridge
at Pecos with 3,300 feet
of Grass-Lined Channel,
I and New Bridges at Federal
and DRGWRR with 3,500 feet
of Rock-Lined Channel
I Floodplain.Preservation 68,100 418,300 602,700
with Structural 1m- 100 2,565,000 215,700 2,333,100 196,200 6,400 184,400 -350,200 -4,164,200 0.16
provernents-New Bridge
I at Pecos with 3,300,feet
, -bf:oGrass-l.ined Channel 692,800
Floodplain Preservation, 100 6,355,300 534,500 812,000 68,300 6,200 83,800 168,700 609,000 -440,300 -5,235,600 0.28
I with Structural Improve-
ments~New Bridges at
Federal and DRGWRR with
3,500 feet of Rock-Lined
I Channel