2009 - Illinois DNR - State of Illinois

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Table 25: Alternative D4 - Combine Alternatives C7 and S11 Cost EstimateFarmer/Prairie CreekAlternative D4 Cost Estimate Aug 04Line Unit TotalItem Item Quantity Unit Price CostAlt. S1 Dude Ranch Alternative 1 Each $244,825 $244,825Alt. S3 LGH Alternative 1 Each $227,117 $227,117Alt. S5 High School Alternative 1 Each $1,472,885 $1,472,885Alt. S8 Belleau Lake Alternative 1 Each $66,651 $66,65154010706 PCBC 7X6 28 Ft $300 $8,40050300225 Concrete Structures 22 CU $550 $12,10050800105 Reinforcement bars 1070 Lbs $1 $1,07044000100 Pavement Removal 154 SQ $6 $92244100100 Pavement Replacement 154 SQ $75 $11,55054010504 60" Concrete Pipe 500 Ft $255 $127,50020800150 Trench Backfill (Road) 88 CY $28 $2,46820200100 Excavation 984 CY $11 $10,726250***** Seeding/Mulching/Fertilizi 0.33 Acres $2,000 $660Contingencies (15%) and Mobilization (6%) of subtotal $36,833Construction Cost $2,223,708Engineering (20%) and Construction Supervision (7.5%) $611,520Alts. S1,S3,S5 Right-of-Way Cost* 976377 SQ FT $1 $976,377Alts. C7 Right-of-Way Cost 14290 SQ FT $5 $71,450Right-of-Way Cost** 719920 SQ FT $0 $0Total Project Cost $3,883,054Alternative Average Annual Cost (5.375% For 50 Years) $225,142O&M (1%) $22,237Alternative Average Annual Cost and O&M (1%) $247,379Baseline Average Annual Damages (Direct and Indirect) $144,531Alternative Average Annual Damages (Direct and Indirect) $17,509Alternative Average Annual Benefits $127,022Benefit Cost Ratio 0.51Frequency 1 2 5 10 25 50 100Existing Damaged Structures 0 1 2 11 38 64 96Alternative Damaged Structures 0 0 0 0 2 9 34Structures Removed from Floodplain 0 1 2 11 36 55 62*Estimated cost of securing a permanent flood easement on existing pond.**0.00 Assessed value because of current public ownership.95
ALTERNATIVE D5 - COMBINE STORAGE ALTERNATIVE S8 WITH DEMPSTERDIVERSION CONVEYANCE IMPROVEMENTS (C2)To achieve flood damage reduction benefits throughout the watershed, this alternativewould combine additional storage at Belleau Lake and conveyance improvements alongDempster Avenue to the upstream side of the Tollway. Each of these components aredescribed below.Belleau Lake would be lowered 4.2 feet by gravity through a 24-inch diameter outletpipe at the invert of Farmers Creek at elevation 622.0. This pipe would be gated to allownormal flows to bypass the lake in Farmers Creek. Steep side slopes, exposed along thewestern edge of the lake by lowered water surface elevations, would be graded at 3:1slopes for safety and stability. When stages in Farmers Creek reach elevation 626.0,excess flows would enter the lake over a spillway constructed between the lake andFarmers Creek. The lowered lake would be capable of providing up to 52 acre-feet ofadditional flood storage capacity at the 100-year frequency event.A sixty inch pipe would be routed down Dempster Avenue to divert the existingDempster Avenue storm sewer, that currently outlets into Prairie Creek downstream ofLutheran General Hospital Pond, to a point on Farmers Creek just downstream ofDempster Avenue near the Tollway. To prevent higher flows between Dempster andBelleau Lake from adversely flooding structures south of Rand Road and east of theTollway, a Tideflex gate would be installed on an existing 54" x 36" culvert under RandRoad.This combination of alternatives would create a project that would provide $59,367 inaverage annual flood damage reduction benefits representing an 41% reduction inaverage annual flood damages in the watershed. The greatest portion of these benefits(76%) would be realized in the Lower Prairie Creek portion of the watershed. Existingflood damages along Prairie Creek would be reduced by 75%. Existing flood damagesalong Lower Farmers Creek would be reduced 32%. Existing flood damages alongUpper Farmers Creek would be reduced 57%. This alternative would eliminate flooddamages for 29 structures currently located in the 100-year frequency floodplain.Project costs of this alternative are estimated at $2,347,184, as detailed on Table 26.Although this alternative eliminates many of the flood damages in the watershed, thebenefit to cost ratio (B/C ratio) for this alternative is 0.38 due to many overlappingproject benefits for the same floodprone structures.96
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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
Page 52 and 53: Exhibit 11: Alternative S6 - Bellea
Page 54 and 55: ALTERNATIVE S7 - LAKE MARY ANNE PUM
Page 56 and 57: 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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