Volume Reduction of Highway Runoff in Urban Areas: Guidance Manual (2015) / Chapter Skim
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B-1 A p p e n d i x B B-1 1 Introduction and Purpose B-2 2 Intended Applications and Functionality B-2 3 General Use of Tool B-2 3.1 System Requirements B-3 3.2 Preparing the Tool for Use B-3 3.3 Starting a New Project B-4 3.4 Organization of the Tool B-5 3.5 Navigating Within the Tool B-5 3.6 Saving and Editing Scenarios B-5 3.7 Printing Summary Results B-5 4 Entering Project Location and Climate Information B-5 4.1 Selecting a Rain Gage B-6 4.2 Providing Site-Specific Precipitation Statistics B-6 5 Entering Project Design Information B-6 5.1 Entering Tributary Area Attributes B-8 5.2 Selecting VRAs and Entering VRA Design Parameters B-8 5.2.1 Entering First VRA Input Parameters B-9 5.2.2 Selecting Two VRAs in a Treatment Train B-10 6 Viewing and Interpreting Volume Performance Results B-10 6.1 Viewing Volume Performance Results B-11 6.2 Running a Sensitivity Analysis B-12 6.3 Viewing Supporting Data B-12 7 Error Messages B-13 8 Tool Theoretical Basis and Technical Assumptions 1 Introduction and Purpose The performance of volume reduction approaches (VRAs) is a function of many factors, including local climate and hydrology, storage volume, VRA design (i.e., footprint, depth, and discharge rates)
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B-2 Volume Reduction of Highway Runoff in Urban Areas reduction based on user-provided location and planning-level project information. This tool is intended to allow DOT staff and contractors to quickly evaluate the relative benefits of various scenarios and assist in developing sizing criteria.
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User's Guide for the Volume performance Tool B-3 3.2 Preparing the Tool for Use To save the tool files on your computer and prepare them for use, follow these steps: 1. Load the tool by accessing the CD-ROM that accompanies this manual (or the ISO image available for download from the project website)
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B-4 Volume Reduction of Highway Runoff in Urban Areas 3.4 Organization of the Tool The tool is divided into various input forms that reside on separate worksheets. In some cases, multiple input forms are found on a single worksheet.
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User's Guide for the Volume performance Tool B-5 3.5 Navigating Within the Tool The tool provides two options for navigation: • The navigation bar that is located below the project information on every page (see Figure 1) provides hyperlinks to jump to each input form.
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B-6 Volume Reduction of Highway Runoff in Urban Areas 4.2 Providing Site-Specific Precipitation Statistics When a gage is selected, the tool provides a number of reference statistics related to the gage, including the 85th- and 95th-percentile, 24-hour storm depths and the average annual precipitation depth. If more accurate precipitation statistics are available for the project location, these data can be used to improve the estimates provided by the tool.
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User's Guide for the Volume performance Tool B-7 Tributary area watershed parameters to update These cells are reference values that are calculated based on the userentered tributary area parameters and the selected precipitation statistics. Figure 4.
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B-8 Volume Reduction of Highway Runoff in Urban Areas 3. Select a tributary area soil type from the drop-down menu provided.
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User's Guide for the Volume performance Tool B-9 worksheet tab. However, if there is a second VRA in your design, refer to the following section for guidance.
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B-10 Volume Reduction of Highway Runoff in Urban Areas 6 Viewing and Interpreting Volume Performance Results 6.1 Viewing Volume Performance Results The Volume Performance Results worksheet is updated based on the scenario that has been inputted in previous forms. It is designed to be printed on a single page to document key inputs as well as results.
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User's Guide for the Volume performance Tool B-11 • Reduction in Runoff Volume. This value represents the predicted average annual volume reduction achieved by the VRAs given the inputs provided.
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B-12 Volume Reduction of Highway Runoff in Urban Areas sensitivity parameters from the drop-down menu to ensure that the parameters being analyzed are applicable to the current design and VRA.
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User's Guide for the Volume performance Tool B-13 the maximum value or overestimating performance if forced to use the minimum value. If the input bounds are exceeded and the minimum or maximum is used, an error message will be displayed for the applicable VRA, similar to that shown in Figure 12.
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B-14 Volume Reduction of Highway Runoff in Urban Areas Example error message notifying user of input data outside of lookup bounds Figure 12. Error message (shown in red)
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