The National Academies Press

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From page 151... ... D-1 General Use of Tool System Requirements • The tool is intended to run in Microsoft Excel 2010 or 2013; macros must be enabled for the tool to run properly. • The tool has been tested in a Windows 7 environment; user experience may differ in other operating system environments. Read the entire page →
From page 152... ... D-2 5. Once the project information is entered into the heading of the Project Location worksheet, the remaining headings on subsequent worksheets will be updated to match. Read the entire page →
From page 153... ... D-3 Each input form contains stepwise instructions and a key to the color of cells that appear in the form. Color coding identifies cells as: User Steps Default data; editing allowed with rationale User Entered Data Guidance Lookup Data; do not edit cells Warnings The user is expected to enter data for each "User Entered Data" cell at a minimum, and should review the default and reference values to verify that they are appropriate. Read the entire page →
From page 154... ... D-4 3. Select the precipitation gage that best represents the project precipitation by using the drop-down menu under "Rain Gages Available in State." Generally, the precipitation gage closest to the project location should be used. Read the entire page →
From page 155... ... D-5 concentration" column. Note that if you select "yes" to the default or "yes" to the question above about editing the defaults, the specific pollutant or all pollutant concentrations will be reset to the default concentration(s) Read the entire page →
From page 156... ... D-6 Entering Capital and Maintenance Costs Information If detailed capital and maintenance costs are available, selecting "yes" to the previous question about editing these costs will unhide two worksheets: "Capital Costs" and "Maintenance Costs." If including the cost of a bridge deck conveyance system, the costs would be input under these tabs. Use the following steps to update the cost information: 1. Read the entire page →
From page 157... ... D-7 better BMP area infiltration rate data are available, such as that obtained from field testing. It is strongly recommended that default infiltration rate values should be updated with site-specific information whenever available. Read the entire page →
From page 158... ... D-8 Note: Guidance regarding the individual BMP parameters is not provided in this guide. Please refer to the "Guidance" and "Default Value" columns located within the Tool that provide guidance for each parameter specific to the BMP selected. Read the entire page →
From page 159... ... D-9 Figure D-9. Volume performance tabular and graphical results. Read the entire page →
From page 160... ... D-10 Error Messages This tool provides volume reduction estimates by referencing tens of thousands of hydrologic simulations. Because an individual simulation is not being run for each individual project, this tool has some inherent limitations. Read the entire page →
From page 161... ... D-11 Bridge Deck Drain System Cost Support Tool A separate spreadsheet is provided to aid the practitioner in computing the cost of the deck drain system, if one is needed to convey runoff to the bridge abutment. The capital cost for the conveyance system is added to the estimate computed by the BMP Evaluation Tool by clicking the Project Options tab to reveal the screen shown in Figure D-13: The user should change the blue input field to "yes" for view/edit of the capital and maintenance cost inputs as desired. Read the entire page →
From page 162... ... D-12 being modeled. The detailed capital cost screen in the evaluation tool is shown in Figure D-14, and the field highlighted where the bridge deck conveyance system cost can be entered. Read the entire page →
From page 163... ... Figure D-16. Inputs and outputs for the bridge deck drainage system cost estimate tool. Read the entire page →
From page 164... ... D-14 runoff from the bridge deck if the longitudinal slope will not support a gravity drain system. Note that the pumping cost is provided to aid the practitioner in demonstrating the infeasibility of a pumped system. Read the entire page →
From page 165... ... D-15 Figure D-18. Bridge deck inlet. Read the entire page →
From page 166... ... D-16 Narrative The spreadsheet is subdivided into four main parts: Part 1: Input -- Bridge Geometry/Rainfall Variables Part 2: Shoulder/Inlet Flow Capacity and Inlets Quantity/Spacing Part 3: Bridge Deck Drainage System Configuration Part 4: Deck Drainage Total Cost/Unit Cost Figure D-21. Collector pipe hanger. Read the entire page →
From page 167... ... D-17 Part 1: Input -- Bridge Geometry/Rainfall Variables The user has the flexibility of varying the following input parameters: • Length of bridge • Width of bridge • Width of gutter/shoulder • Deck grade (longitudinal slope) • Deck cross section slope • Rainfall intensity The length of the bridge can be varied from 60 ft to 10,000 ft. Read the entire page →
From page 168... ... D-18 sidewalk, that conveys water during a storm runoff event. It may include a portion or all of the shoulder. Read the entire page →
From page 169... ... D-19 The distance from the beginning of bridge to the first inlet is then calculated at a point at which the flow width equals the shoulder width. The spacing of the drains is then a resultant of the flow intercepted and width of bridge. Read the entire page →
From page 170... ... D-20 The cost of each item is determined based on the weight of the item and a unit cost (including 10% contingency) of $6.10/lb of steel. Read the entire page →

From page 151...

... D-1 General Use of Tool System Requirements • The tool is intended to run in Microsoft Excel 2010 or 2013; macros must be enabled for the tool to run properly. • The tool has been tested in a Windows 7 environment; user experience may differ in other operating system environments.