Long-Term Performance and Life-Cycle Costs of Stormwater Best Management Practices (2014) / Chapter Skim
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Pages 77-90
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From page 77... ...
77 C H a P T E r 7 This chapter presents the basis for the development of the whole life cost (WLC) models for the selected BMPs.
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78 • Construction (or purchase of a proprietary device) ; • Use and maintenance; and • Disposal/decommissioning.
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79 Following is a brief description of some major factors affecting costs: 1. Project scale and unit costs.
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80 and these relate mainly to frequency of the activity being undertaken. These are defined as: • Low/minimum: A basic level of maintenance required to maintain the function of the stormwater control.
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81 New Versus Retrofit Costs In a report prepared by the URS Corporation (2012) for the NCDOT entitled Stormwater Runoff from Bridges: Final Report to Joint Legislation Transportation Oversight Committee, URS evaluates the adjustment required when estimating costs for stormwater retrofit projects for bridges compared to new construction of the same design.
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82 can also have unforeseen costs such as difficult site drainage or other difficulties that may not be encountered with a new construction project (URS Corporation, 2012)
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83 Example 7-2 presents the worksheet used to estimate capital costs for the facility. The default baseline unit costs were developed by examining DOT bid tabulations and adjusting to an RS Means value of 100.
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84 Example 7-1. Project options worksheet.
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Example 7-2. Example capital cost worksheet.
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Example 7-2. (Continued)
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ROUTINE MAINTENANCE ACTIVITIES (Frequent, scheduled events) Frequency (months betw.
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88 Whole Life Costs Cash Present Value Cash Sum ($) 571864.78 170119.50 0.00 1.00 20063.04 20063.04 20063.04 20063.04 20063.04 1.00 0.95 1.03 0.00 3120.00 0.00 3213.60 3213.60 3060.57 23276.64 23123.62 2.00 0.91 1.06 0.00 3120.00 0.00 3310.01 3310.01 3002.27 26586.65 26125.89 3.00 0.86 1.09 0.00 3120.00 0.00 3409.31 3409.31 2945.09 29995.96 29070.98 4.00 0.82 1.13 0.00 3120.00 6740.00 11097.52 11097.52 9129.95 41093.48 38200.93 5.00 0.78 1.16 0.00 3120.00 0.00 3616.94 3616.94 2833.96 44710.41 41034.90 6.00 0.75 1.19 0.00 3120.00 0.00 3725.44 3725.44 2779.98 48435.86 43814.88 7.00 0.71 1.23 0.00 3120.00 0.00 3837.21 3837.21 2727.03 52273.06 46541.91 8.00 0.68 1.27 0.00 3120.00 6740.00 12490.35 12490.35 8453.96 64763.42 54995.87 9.00 0.64 1.30 0.00 3120.00 0.00 4070.89 4070.89 2624.13 68834.31 57620.01 10.00 0.61 1.34 0.00 3120.00 0.00 4193.02 4193.02 2574.15 73027.33 60194.16 11.00 0.58 1.38 0.00 3120.00 0.00 4318.81 4318.81 2525.12 77346.14 62719.28 12.00 0.56 1.43 0.00 3120.00 6740.00 14058.00 14058.00 7828.02 91404.14 70547.30 13.00 0.53 1.47 0.00 3120.00 0.00 4581.83 4581.83 2429.84 95985.96 72977.14 14.00 0.51 1.51 0.00 3120.00 0.00 4719.28 4719.28 2383.56 100705.24 75360.69 15.00 0.48 1.56 0.00 3120.00 0.00 4860.86 4860.86 2338.16 105566.10 77698.85 16.00 0.46 1.60 0.00 3120.00 6740.00 15822.41 15822.41 7248.43 121388.51 84947.28 17.00 0.44 1.65 0.00 3120.00 0.00 5156.88 5156.88 2249.93 126545.39 87197.21 18.00 0.42 1.70 0.00 3120.00 0.00 5311.59 5311.59 2207.08 131856.98 89404.28 19.00 0.40 1.75 0.00 3120.00 0.00 5470.94 5470.94 2165.04 137327.92 91569.32 20.00 0.38 1.81 0.00 3120.00 6740.00 17808.26 17808.26 6711.74 155136.18 98281.07 21.00 0.36 1.86 0.00 3120.00 0.00 5804.12 5804.12 2083.34 160940.30 100364.41 22.00 0.34 1.92 0.00 3120.00 0.00 5978.24 5978.24 2043.66 166918.54 102408.07 23.00 0.33 1.97 0.00 3120.00 0.00 6157.59 6157.59 2004.73 173076.13 104412.81 24.00 0.31 2.03 0.00 3120.00 6740.00 20043.35 20043.35 6214.80 193119.48 110627.61 25.00 0.30 2.09 0.00 3120.00 0.00 6532.59 6532.59 1929.09 199652.07 112556.70 26.00 0.28 2.16 0.00 3120.00 0.00 6728.56 6728.56 1892.35 206380.63 114449.04 27.00 0.27 2.22 0.00 3120.00 0.00 6930.42 6930.42 1856.30 213311.05 116305.34 28.00 0.26 2.29 0.00 3120.00 6740.00 22558.97 22558.97 5754.65 235870.02 122059.99 29.00 0.24 2.36 0.00 3120.00 0.00 7352.48 7352.48 1786.26 243222.51 123846.25 30.00 0.23 2.43 0.00 3120.00 0.00 7573.06 7573.06 1752.24 250795.56 125598.49 31.00 0.22 2.50 0.00 3120.00 0.00 7800.25 7800.25 1718.86 258595.82 127317.35 32.00 0.21 2.58 0.00 3120.00 6740.00 25390.32 25390.32 5328.57 283986.13 132645.91 33.00 0.20 2.65 0.00 3120.00 0.00 8275.29 8275.29 1654.00 292261.42 134299.92 34.00 0.19 2.73 0.00 3120.00 0.00 8523.54 8523.54 1622.50 300784.96 135922.41 35.00 0.18 2.81 0.00 3120.00 0.00 8779.25 8779.25 1591.59 309564.21 137514.01 36.00 0.17 2.90 0.00 3120.00 6740.00 28577.02 28577.02 4934.04 338141.24 142448.04 37.00 0.16 2.99 0.00 3120.00 0.00 9313.91 9313.91 1531.54 347455.14 143979.58 38.00 0.16 3.07 0.00 3120.00 0.00 9593.32 9593.32 1502.37 357048.47 145481.95 39.00 0.15 3.17 0.00 3120.00 0.00 9881.12 9881.12 1473.75 366929.59 146955.70 40.00 0.14 3.26 0.00 3120.00 6740.00 32163.69 32163.69 4568.71 399093.29 151524.41 41.00 0.14 3.36 0.00 3120.00 0.00 10482.88 10482.88 1418.14 409576.17 152942.55 42.00 0.13 3.46 0.00 3120.00 0.00 10797.37 10797.37 1391.13 420373.54 154333.68 43.00 0.12 3.56 0.00 3120.00 0.00 11121.29 11121.29 1364.63 431494.83 155698.31 44.00 0.12 3.67 0.00 3120.00 6740.00 36200.52 36200.52 4230.44 467695.35 159928.75 45.00 0.11 3.78 0.00 3120.00 0.00 11798.58 11798.58 1313.14 479493.93 161241.89 46.00 0.11 3.90 0.00 3120.00 0.00 12152.54 12152.54 1288.13 491646.47 162530.02 47.00 0.10 4.01 0.00 3120.00 0.00 12517.11 12517.11 1263.59 504163.58 163793.62 48.00 0.10 4.13 0.00 3120.00 6740.00 40744.00 40744.00 3917.21 544907.58 167710.83 49.00 0.09 4.26 0.00 3120.00 0.00 13279.40 13279.40 1215.91 558186.99 168926.74 50.00 0.09 4.38 1.00 3120.00 0.00 13677.79 13677.79 1192.75 571864.78 170119.50 Cumulative Costs Year Discount Factor Cost Escalation Capital & Assoc.
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89 Whole Life Cycle Costs Summary Total Facility Base Cost Total Associated Capital Costs (e.g., Engineering, Land, etc.) Capital Costs Inspection, Reporting & Information Management 0.5 $180 $360 Vegetation Management with Trash & Minor Debris Removal 0.5 $1,380 $2,760 add additional activities if necessary 0 $0 $0 add additional activities if necessary 0 $0 $0 Totals, Regular Maintenance Activities $3,120 Corrective Maintenance 4 $6,740 $1,685 add additional activities if necessary 0 $0 $0 add additional activities if necessary 0 $0 $0 Totals, Corrective & Infrequent Maintenance Activities $1,685 Capital Costing Method Assumed Level of Maintenance Estimated Capital Cost, $ (2013)
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90 $0 $5,000 $10,000 $15,000 $20,000 $25,000 0.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00 44.00 48.00 N et P re se nt V al ue Year Net Present Value over Time Figure 7-2. Example net present value of costs graph.
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