2009 - Illinois DNR - State of Illinois

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Table 27: Alternative D6 - Combine Alternatives C7 and S4 Cost EstimateFarmer/Prairie CreekAlternative D6 Cost Estimate Aug 04Line Unit TotalItem Item Quantity Unit Price CostAlt. S3 LGH Alternative 1 Each $227,117 $227,117Alt. S5 High School Alternative 1 Each $1,472,885 $1,472,88554010706 PCBC 7X6 28 Ft $300 $8,40050300225 Concrete Structures 22 CU YD $550 $12,10050800105 Reinforcement bars 1070 Lbs $1 $1,07044000100 Pavement Removal 154 SQ YD $6 $92244100100 Pavement Replacement 154 SQ YD $75 $11,55054010504 60" Concrete Pipe 500 Ft $255 $127,50020800150 Trench Backfill (Road) 88 CY $28 $2,468250***** Seeding/Mulching/Fertilizin 0.33 Acres $2,000 $66020200100 Excavation 984 CY $11 $10,726Contingencies (15%) and Mobilization (6%) of subtotal $36,833Construction Cost $1,912,231Engineering (20%) and Construction Supervision (7.5%) $525,864Alts. S3,S5 Right-of-Way Cost* 663561 SQ FT $1 $663,561Alts. C4, C6 Right-of-Way Cost 14290 SQ FT $5 $71,450Total Project Cost $3,173,106Alternative Average Annual Cost (5.375% For 50 Years) $183,979O&M (1%) $19,122Alternative Average Annual Cost and O&M (1%) $203,101Baseline Average Annual Damages (Direct and Indirect) $144,531Alternative Average Annual Damages (Direct and Indirect) $64,374Alternative Average Annual Benefits $80,157Benefit Cost Ratio 0.39Frequency 1 2 5 10 25 50 100Existing Damaged Structures 0 1 2 11 38 64 96Alternative Damaged Structures 0 1 1 3 11 30 44Structures Removed from Floodplain 0 0 1 8 27 34 52*Estimated cost of securing a permanent flood easement on existing pond.101
ALTERNATIVE D7 - COMBINE ALTERNATIVE S11 WITH ADDITIONALCONVEYANCE AT DEE ROAD (C4)To achieve flood damage reduction benefits throughout the watershed, this alternativewould combine various storage and conveyance alternatives including construction of apump station a Lake Mary Anne, modifications to the Dude Ranch Pond, modificationsto the Lutheran General Hospital Pond, construction of a new reservoir on the MaineTownship High School campus, modifications to Belleau Lake, and culvertimprovements on Prairie Creek at Dee Road. Each of the components of this alternativeare described below.The Dude Ranch Pond, a 5.4 acre pond located south of Golf Road and east of the Tri-State Tollway, would be enlarged and connected to Farmers Creek to increase upperFarmers Creek storage by 30 acre-feet. Storage in the pond would be controlled by anew 48-inch diameter outlet pipe through a provisional Class I dam structure constructedin the Farmers Creek channel just downstream of the existing pond. A pump stationwould be constructed on the south shore of Lake Mary Anne to pump water from LakeMary Anne to the Dude Ranch Pond. A 10 cfs pump station, with an 18-inch diameterdischarge pipe, constructed at the existing outlet of Lake Mary Anne and pumping in tothe Dude Ranch Pond, would provide Lake Mary Anne greater outlet capacity andprevent 100 year frequency event water levels in Lake Mary Anne from reaching mostfloodprone structures around the lake. The normal pool elevation of Lake Mary Annewould remain unchanged at 632.5. Overflows from the existing IDOT Golf Roadinterceptor sewer would also be stored and controlled by the expanded Dude Ranch Pondsite.The Lutheran General Hospital Pond Alternative, S3, would be supplemented with anadditional 50 acre-feet flood storage provided on the Maine Township East High Schoolcampus immediately south of the Lutheran General Hospital Pond and DempsterAvenue. Existing soccer fields located on the southeast corner of the Maine TownshipEast High School campus, would be lowered up to 7.5 feet and the sides graded at aslope of 3:1 to create a new reservoir. These athletic fields currently provide somedetention for local stormwater runoff. Three soccer fields would fit in the bottom of thereservoir. A ten foot service road around the perimeter of the area would providemaintenance access to the reservoir. A 60-inch diameter culvert would be installed toconnect the new gravity in and gravity out High School Reservoir to an existing 60-inchDempster Avenue storm sewer, tributary to Prairie Creek, on the Lutheran General102
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Alternative C5 - Pipe From Lutheran
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27. Alternative D6 - Combine Altern
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As shown in Exhibit 1, the study ar
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construct addition flood water stor
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PURPOSE AND AUTHORITYThis report hi
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infrastructure and commercial devel
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Central Road20120220620420710110410
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TABLE 3: CRITICAL DURATION DETERMIN
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Prairie Creek is modeled as a singl
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TABLE 5 CONTINUED: CALIBRATION DATA
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average annual damages under existi
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EXHIBIT 5: SAMPLE FLOOD DAMAGE COMP
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DAMAGE RESULTS TABLE 8PLAN DESCRIPT
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FLOOD DAMAGE REDUCTION ALTERNATIVES
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STORAGE IMPROVEMENTSALTERNATIVE S1
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Table 9: Alternative S1 - Dude Ranc
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Exhibit 7: Alternative S2 - Good Av
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ALTERNATIVE S3 - LUTHERAN GENERAL H
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Table 11: Alternative S3 - Lutheran
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Exhibit 9: Alternative S4 - Luthera
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ALTERNATIVE S5 - HIGH SCHOOL RESERV
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Table 13: Alternative S5 - High Sch
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Exhibit 11: Alternative S6 - Bellea
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ALTERNATIVE S7 - LAKE MARY ANNE PUM
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Table 15: Alternative S7 - Lake Mar
Page 58 and 59: Exhibit 13: Alternative S8 - Bellea
Page 60 and 61: ALTERNATIVE S9 -COMBINED STORAGE AT
Page 62 and 63: normal flows to bypass the lake in
Page 64 and 65: Table 17: Alternative S9 - Combined
Page 66 and 67: An additional 50 acre-feet flood st
Page 68 and 69: Table 18: Alternative S10 - Combine
Page 70 and 71: the flood storage at the site by ap
Page 72 and 73: Table 19: Alternative S11 - Combine
Page 74 and 75: Exhibit 17: Alternative S12 - Dude
Page 76 and 77: CONVEYANCE IMPROVEMENTSALTERNATIVE
Page 78 and 79: ALTERNATIVE C3 - DEMPSTER STORM SEW
Page 80 and 81: ALTERNATIVE C5 - PIPE FROM LUTHERAN
Page 82 and 83: ALTERNATIVE C7 - REPLACE RANCHO LAN
Page 84 and 85: OTHER IMPROVEMENTSALTERNATIVE L1- P
Page 86 and 87: COMBINATION IMPROVEMENTSALTERNATIVE
Page 88 and 89: damages for 59 structures currently
Page 90 and 91: Table 22 Continued: Alternative D1F
Page 92 and 93: Hospital property, north of Dempste
Page 94 and 95: Table 23: Alternative D2 - Combine
Page 96 and 97: sewer system would be restricted to
Page 100 and 101: sewer system would be restricted to
Page 104 and 105: Exhibit 31: Alternative D5 - Combin
Page 106 and 107: ALTERNATIVE D6 - COMBINE STORAGE AL
Page 114 and 115: Exhibit 34: Alternative D8 - Combin
Page 116 and 117: ALTERNATIVE D9 - COMBINE STORAGE AL
Page 118 and 119: Existing flood damages along Lower
Page 120 and 121: Table 30 Continued: Alternative D9F
Page 126 and 127: ALTERNATIVE D11 - COMBINE STORAGE A
Page 128 and 129: Exhibit 37: Alternative D11 - Combi
Page 130 and 131: Table 32 Continued: Alternative D11
Page 133: ALTERNATIVE D13: PRAIRIE CREEK CULV
Page 136 and 137: community can realize additional re
Page 138 and 139: concrete block or brick veneer over
Page 141 and 142: CONCLUSIONSFarmers and Prairie Cree
Page 143 and 144: costs to construct these improvemen
Page 145 and 146: S1S2S3S7S8S12S11S9D7TABLE 33 Farmer
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2009 - Illinois DNR - State of Illinois

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