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Pages 30-47

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From page 30...
... 30 Aligned with the objective of the synthesis, which is to document state DOT use of DRRMs, a questionnaire was distributed to the state hydraulic engineer (or equivalent position) at the 50 state DOTs, Puerto Rico DOT, and the District of Columbia DOT.
From page 31...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 31 Figure 10. Map indicating the state DOTs that have responded to the questionnaire.
From page 32...
... 32 Resilient Design with Distributed Rainfall-Runoff Modeling Figure 11. Map with the state DOTs that have indicated the use of DRRMs in their hydrological designs and studies.
From page 33...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 33 Figure 12. Hydrological modeling techniques DOTs use for roadway projects.
From page 34...
... Figure 14. DRRMs or model components used by DOTs for roadway infrastructure projects.
From page 35...
... Figure 15. Who uses DRRMs at DOTs for roadway infrastructure projects?
From page 36...
... 36 Resilient Design with Distributed Rainfall-Runoff Modeling better spatial representation using grids, sub-catchments or hydrologic response units, and better representation/estimates of rainfall loss, runoff transformation, and routing as factors/advantages. Further descriptions of factors/advantages that state DOTs consider for determining the use of DRRMs are presented in Figure 17.
From page 37...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 37 Figure 18. Hydrological predictions applications/areas improved with the use of DRRMs reported by DOTs.
From page 38...
... 38 Resilient Design with Distributed Rainfall-Runoff Modeling Regarding the evolution of the application of DRRMs over time, eight agencies (50%) reported that these tools are being applied for the applications they initially envisioned.
From page 39...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 39 Figure 21. DOTs' minimum drainage area for selecting/utilizing DRRMs.
From page 40...
... 40 Resilient Design with Distributed Rainfall-Runoff Modeling Figure 22. DOTs' maximum drainage area for selecting/utilizing DRRMs.
From page 41...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 41 six agencies (56% and 38%, respectively) , as presented in Figure 23, and "Other" data requirements are presented in Table 11.
From page 42...
... 42 Resilient Design with Distributed Rainfall-Runoff Modeling Figure 24. Rainfall data used by DOTs in DRRMs.
From page 43...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 43 Other Answers for Question 14 NOAA. Hydrology Panel is currently evaluating ways to account for precipitation changes due to climate changes.
From page 44...
... 44 Resilient Design with Distributed Rainfall-Runoff Modeling Question 16 inquired about the alternatives to calculate effective rainfall transformation or runoff models/methods for DRRMs. Similar to Question 15, the SCS/NRCS-based UH approach was the most commonly used by state DOTs (14, or 88%)
From page 45...
... Figure 28. DOTs that reported stream/reservoir routing models/methods for DRRMs used for roadway infrastructure projects.
From page 46...
... 46 Resilient Design with Distributed Rainfall-Runoff Modeling runoff hydrographs for engineering design, rainfall loss estimation results in greater uncertainty and contributes more model errors than variations of UH methods and model parameters for UH. Assessing Costs and Benefits of DRRMs The survey sought to obtain the components/metrics used by state DOTs when assessing cost– benefit analysis when utilizing DRRMs.
From page 47...
... Survey of State Practices for Distributed Rainfall-Runoff Modeling 47 Other Answers for Question 19 Division uses an automated hydrology system called GISHydroNXT/WEB. DRRM in some situations is the only alternative to effectively answer flood vulnerabilities.

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