Highway Hydraulic Engineering State of Practice (2020) / Chapter Skim
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Pages 35-54
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From page 35... ...
35 Survey Summary How each state collects information is summarized in this chapter. A survey was sent via an electronic questionnaire to state hydraulic engineers of DOTs across the nation, including Puerto Rico and Washington, D.C.
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From page 36... ...
36 Highway Hydraulic Engineering State of Practice In addition to reporting statistics on responses, regional observations were investigated for apparent trends using the EPA Standard Federal Regions (chosen as most appropriate regional divisions in a geographical context) , as shown in Figure 10 (EPA 2018)
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From page 37... ...
Survey Questionnaire 37 with Wisconsin having a policy pending. North Carolina, Utah, and Washington State each have different limits for temporary construction and permanent maximum allowable spread.
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38 Highway Hydraulic Engineering State of Practice Of the 28 states that gave sources of information for changes in practices to include sensitive aquatic organism passage and habitats for culvert replacement, 18 (64%) use a state hydraulics manual, 20 (71%)
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Survey Questionnaire 39 State Coordination with Regulatory Agencies Change in Rehabilitation Practice to Include Aquatic Organism Passage Change in Replacement Practice to Include Aquatic Organism Passage Alaska Previously Included Previously Included Previously Included Arkansas No No No California Previously Included Previously Included Previously Included Connecticut Yes No No Delaware Yes Yes Yes Georgia Yes No Yes Iowa Yes No Yes Illinois Yes No Yes Maryland Yes Policy Pending Policy Pending Maine Yes Yes Yes Michigan Previously Included No Previously Included Minnesota Previously Included Yes Yes Missouri No No Yes Montana Previously Included No Yes North Carolina Previously Included Policy Pending Previously Included North Dakota Yes Yes Yes Nebraska Previously Included No No New Hampshire Yes Yes Yes New York Yes Yes Yes Oklahoma Yes No No Oregon Yes Previously Included Previously Included Pennsylvania Yes Yes Yes South Dakota No No Yes Tennessee Policy Pending Policy Pending Policy Pending Texas Yes No No Utah Yes Yes Yes Virginia Yes Yes Yes Washington Yes Yes Yes Wisconsin Policy Pending Policy Pending Policy Pending West Virginia Previously Included Yes Yes Wyoming Previously Included No Previously Included Table 3. States that made a change to include coordination with regulatory agencies or consideration of aquatic organism passage in rehabilitation or replacement of culverts.
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From page 40... ...
40 Highway Hydraulic Engineering State of Practice Source State State Hydraulic Manual FHWA HEC-26 USDA USFS Stream Simulation HDS 5 Other Alaska X X X California X X Colorado X Connecticut Recommendations from regulatory agency (Fisheries) Delaware X X Maryland Presently, a case-by-case design as agreed upon with environmental agencies; future designs to be based on policy guidelines being developed by the Michigan DOT SHA/MDE Hydraulics Panel.
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From page 41... ...
Survey Questionnaire 41 State State Hydraulic Manual FHWA HEC-26 USDA USFS Stream Simulation HDS 5 Other Alaska X X X X California X X X X Connecticut X X X X X Delaware X X Georgia X X X X Hawaii X X Iowa X X Illinois X Maryland X Michigan X X Minnesota X X Missouri X Montana X North Carolina X X North Dakota X Nebraska X X X New Hampshire X X X New Mexico New York X X X Ohio X X Oklahoma X X Oregon X X X X Pennsylvania X X Rhode Island X X X X X South Dakota X X X Tennessee X Texas X X X Utah X Virginia X X X Vermont X X Washington X X Wisconsin X X X West Virginia X X X X Wyoming X Table 5. Sources of information used for practices for sensitive aquatic organism passage and habitats for culvert replacement.
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From page 42... ...
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Coordination with Regulatory Agencies Change in Rehabilitation Practice to Include Aquatic Organism Passage Change in Replacement Practice to Include Aquatic Organism Passage Yes Previously IncludedNo Policy Pending Figure 12. States that made a change in dealing with regulatory agencies, rehabilitation, or replacement regarding aquatic organism passage in culverts.
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From page 43... ...
State Comp Method Change? Scour Countermeasure Change?
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44 Highway Hydraulic Engineering State of Practice Four states shared information regarding scour countermeasure design (Table 9)
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State c. Other Alaska No Some None Some None Arkansas No Few None Few None California No Few None Few None Colorado No Some None Some None Connecticut No Few None Few None Delaware No Some None Some None Georgia No Some None Few None Iowa No Few None Some None 2D Steady Bridge Design Illinois No Few None None None Maryland Yes Few Few Maine None None None None SRH-2D Michigan No None None None None Minnesota No Few None None None Montana No None None None None 2D Steady Bridge Design North Carolina Policy Pending Few None None None Nebraska Yes Most studies None Few None New Hampshire Previously Required Some Few Few Few New Mexico Policy Pending Some None None None New York Yes Few a.
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From page 46... ...
46 Highway Hydraulic Engineering State of Practice Of the 38 states that responded to changing policy or guidance in the past 10 years to comply with local floodplain requirements, 11 (29%) reported a change, 17 (47%)
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From page 47... ...
Survey Questionnaire 47 Vermont No No No No No Washington Yes Yes Yes Yes Yes West Virginia Has Programmatic Agreement Has Programmatic Agreement No Yes No Wyoming Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement No Oklahoma Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement Oregon No No No No No Pennsylvania Yes Yes Yes Yes Yes Rhode Island Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement Has Programmatic Agreement South Dakota Has Programmatic Agreement Yes No No No Tennessee Yes Yes No Yes No Texas Has Programmatic Agreement Yes No Has Programmatic Agreement No Utah Yes Yes Yes Yes Yes Agreement Agreement Virginia Has Programmatic Has Programmatic No Yes Yes State State oversight for FHWA National Environmental Policy Act (NEPA) : Clean Water Act (CWA)
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From page 48... ...
48 Highway Hydraulic Engineering State of Practice Shown in Figure 14 are percentages of states responding (N = 37) that changed policies with respect to state oversight of the NEPA, CWA Section 404, compliance with local floodplain requirements, requirements for the NPDES, and requirements for LID (e.g., bioretention, permeable pavement)
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From page 49... ...
State Flood Frequency Mitigation No Adverse Impact/Zero Rise Alaska Yes No Yes California Previously included Previously included No Colorado Previously included Yes Yes Connecticut No Policy Pending Policy Pending Delaware Policy Pending Policy Pending No Iowa Yes No No Illinois Previously included No Previously included Michigan Previously included No Previously included Minnesota Previously included Previously included Previously included Missouri Previously included Previously included Previously included Montana Previously included No Policy Pending North Carolina Policy Pending Policy Pending Previously included New Mexico Previously included Previously included Previously included New York Yes Yes No Ohio No No Yes Oklahoma Previously included Previously included Previously included Oregon Previously included Previously included Previously included Pennsylvania Yes Yes Previously included Rhode Island Previously included Previously included Previously included Tennessee Previously included Previously included Previously included Utah Previously included No Previously included Virginia Previously included Previously included Previously included West Virginia Previously included Previously included Previously included Wyoming Previously included Previously included Previously included Table 12. States that made a change in floodplain impact policy/guidance.
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From page 50... ...
50 Highway Hydraulic Engineering State of Practice 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Flood Frequency Mitigation No Adverse Impact/Zero Rise Yes No Previously Included Policy Pending Figure 15. States that made a change in floodplain impact policy guidance.
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From page 51... ...
Survey Questionnaire 51 different policy requirements for unsteady flow, and other requirements in policies/guidance for zero rise or no adverse impact. Coastal Hydraulics Of the 38 states responding to the survey, 14 represented coastal states (excluding the Great Lakes region)
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From page 52... ...
52 Highway Hydraulic Engineering State of Practice Alternative Project Delivery Methods Of the 21 states that responded to changing policy or guidance within the last 10 years to include prescriptive alternative delivery policy for hydraulic aspects of projects, five (24%) reported new policy or guidance, four (19%)
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From page 53... ...
Survey Questionnaire 53 When asked about documentation of alternative delivery policy or guidance that includes provisions for hydraulic design, six states (29%) replied that provisions for hydraulic policy are combined in an alternative delivery project manual, and another six states (29%)
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From page 54... ...
54 Highway Hydraulic Engineering State of Practice 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Yes No Previously Included Policy Pending N/A Figure 17. Alternative delivery policy for hydraulic aspects of projects.
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