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<br />Table 8-2
<br />"100-year Channel Improvements"
<br />
<br />Alternate Cost Summary - Alternate 2
<br />
<br />ALTERNATE 3 - MAINTAIN EXISTING FLOODPLAIN CONFIGURATION
<br />
<br />This alternate would adopt the new floodplain mapping without proposing mitigation improvements
<br />at this time. Non-structural methods including flash flood forecasting and warning systems and
<br />evacuation plans would be implemented. Flood insurance and floodproofing of structures would also
<br />be recommended (at the private property owner's expense). Floodplain regulations would be strictly
<br />enforced. Post flood relief would be provided.
<br />
<br />8.5
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<br />This alternate requires no new funding, but may sacrifice opportunities to greatly improve Fourmile
<br />Canyon Creek and mitigate flooding in the future. A "Do Nothing" solution would offer no
<br />opportunity to mitigate spills and flooding to the south of Fourmile Canyon Creek and would offer no
<br />opportunity to eliminate flooding to the Waldorf or Crestview Elementary Schools.
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<br />Table 8-3
<br />Alternate Cost Summary - Alternate 3 "Maintain Existing Floodplain Configuration"
<br />
<br />4-1b
<br />
<br />Reach by reach cost estimates were prepared for the three selected alternates and are summarized in
<br />Tables 8-1, 8-2 and 8-3 and are discussed in greater detail below. The cost estimates are divided into
<br />two general categories, flood control improvements and improvements not required for flood control
<br />mitigation. The two general categories were further subdivided into construction
<br />ROW/property acquisition costs and O&M costs Appropriate contingencies have been
<br />These are described later in this chapter.
<br />
<br />is shown in Figures 4-1 a,
<br />
<br />costs,
<br />added.
<br />
<br />in Chapter 4 and
<br />
<br />in detail
<br />
<br />is discussed
<br />
<br />AL TERNA TE COST ESTIMATES
<br />
<br />The draft existing floodplain
<br />and 4-1c.
<br />
<br />8.6
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<br />Reach Flood Control Improvements Improvements Not Required
<br /> for Flood Control Mitigation
<br /> Const. ROW Channel Sub- Total Const. ROW Sub-Total
<br /> Cost Cost O&M Cost Cost
<br /> ($) ($) ($) ($) ($) ($) ($)
<br />1 0 0 935,000 935,000 0 0 0
<br />2a 0 0 348,000 348,000 0 0 0
<br />2b 0 0 220,000 220.000 0 0 0
<br />3 0 0 264,000 264,000 0 0 0
<br />4 0 0 554,000 554,000 0 0 0
<br />5 0 0 253,000 253,000 0 0 0
<br />6a 0 0 228,000 228,000 0 0 0
<br />6b 0 0 357,000 357,000 0 0 0
<br />6c 0 0 136,000 136,000 0 0 0
<br />Total 0 0 3,297,000 3,297,000 0 0 0
<br />
<br />o
<br />o
<br />o
<br />
<br />60,000
<br />40,000
<br />130,000
<br />310,000
<br />o
<br />
<br />Table 8-1
<br />"50-year Channel Improvements"
<br />
<br />Improvements Not Required for
<br />Flood Control Mitigation
<br />ROW Sub- Total
<br />Cost
<br />($) -
<br />o
<br />
<br />60,000
<br />40,000
<br />130,000
<br />
<br />($)
<br />
<br />o
<br />o
<br />o
<br />o
<br />o
<br />
<br />o
<br />o
<br />o
<br />
<br />Const
<br />Cost
<br />($)
<br />
<br />Following is a more detailed description of how the costs were developed for each of the alternates.
<br />Flood Control Imorovements Construction Costs
<br />
<br />
<br />
<br />8-15
<br />
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<br />540,000
<br />
<br />1
<br />
<br />1
<br />
<br />Reach Flood Control Improvements Improvements Not Required for
<br /> Flood Control Mitigation
<br /> Const. ROW Channel Sub- Total Const. ROW Sub-Total
<br /> Cost Cost O&M Cost Cost
<br /> ($) ($) ($) ($) ($) ($) ($)
<br />1 580,000 0 644,000 1,224,000 0 0 0
<br />2a 0 0 250,000 250,000 0 0 0
<br />2b 1,060,000 0 183,000 1,243,000 0 0 0
<br />3 1,010,000 130,000 160,000 1,300,000 60,000 0 60,000
<br />4 4,820,000 2,980,000 303,000 8,103,000 40,000 0 40,000
<br />5 1,630,000 130,000 273,000 2,033,000 130,000 0 130,000
<br />6a 3,560,000 840,000 153,000 4,553,000 790,000 520,000 1,310,000
<br />6b 60,000 0 276,000 336,000 0 0 0
<br />6c 0 0 107,000 107,000 0 0 0
<br />Total 12,720,000 4,080,000 2,349,000 19,149,000 1,020,000 520,000 1,540,000
<br />
<br />520.000
<br />o
<br />
<br />o
<br />520.000
<br />
<br />790,000
<br />o
<br />o
<br />020,000
<br />
<br />1
<br />
<br />Sub-Total
<br />
<br />ill
<br />1,136,000
<br />262,000
<br />759,000
<br />1,176,000
<br />4,949,000
<br />2,203,000
<br />2,905,000
<br />327,000
<br />107,000
<br />13.824.000
<br />
<br />Channel
<br />O&M
<br />($)
<br />646,000
<br />262,000
<br />169,000
<br />186,000
<br />329,000
<br />273,000
<br />225,000
<br />277,000
<br />107,000
<br />2.474,000
<br />
<br />Flood Control Improvements
<br />
<br />Alternate Cost Summary - Alternate 1
<br />
<br />ROW
<br />Cost
<br />($) -
<br />o
<br />
<br />o
<br />o
<br />90.000
<br />
<br />540,000
<br />130.000
<br />
<br />1
<br />
<br />Const.
<br />Cost
<br />..ill-
<br />490.000
<br />o
<br />
<br />590,000
<br />900,000
<br />
<br />3,080,000
<br />1,800,000
<br />1,840,000
<br />50,000
<br />o
<br />8.750,000
<br />
<br />Reach
<br />
<br />1
<br />2a
<br />2b
<br />3
<br />4
<br />5
<br />6a
<br />6b
<br />6c
<br />Total
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<br />840,000
<br />o
<br />o
<br />2.600,000
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