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September 1 - 130 - McBride

  1. Promoting Adoption of Ditch Conservation Practices: Lessons Learned from H2Ohio State Funding in Ohio
  2. About: • Launched by Governor Mike DeWine in 2019, H2Ohio is a comprehensive water quality initiative that is working to strategically address serious water issues that have been building in Ohio for decades. • H2Ohio was first funded by the Ohio General Assembly with an investment of $172 million in the 2020-2021 biennium. • This funding has allowed H2Ohio to begin the long-term process to reduce phosphorus runoff from farms using proven, science-based agronomic BMPs, wetlands, riparian buffers, and two-stage ditches.
  3. Agronomic Practices: • $62 million annually • 35% of WLEB enrolled (1.5 million acres) • 2,400 contracts
  4. Current H2Ohio Program Enrollment - Farm Bill Wetland and Buffer Practices • Farm Bill Wetlands 2,872 Aces • Farm Bill Forested Riparian Buffers 119 Acres • Total Funds Encumbered $6 million
  5. Newest Addition!!! “Governor DeWine Announces $5 Million Grant Program for New H2Ohio Best Management Practice…” Two-Stage Ditches
  6. Grant Details: Requirements 1. Final constructed two-stage ditches must be placed on ORC 6137 maintenance program. •A projects petitioned via ORC 940 or 6131 •Private group projects. •Ditches currently on maintenance. 2. Must be two-stage or self-forming designs. •Design must meet regionally accepted methods. •For example, using the Tri-Stage Regional Curve to size the two-stage ditch. Two-Stage Ditch
  7. Two-Stage Ditch Self-Forming Ditch -Increased Phosphorus Removal
  8. Grant Details: Applications • Applications are reviewed by ODA staff. • Must include preliminary design info AND requested funds. • Preliminary design info includes plan map, grades, lengths, structures, size, and watersheds • Requested funds may cover costs for all two-stage ditch sections and their associated structures, excluding bridges and other crossings. Two-Stage Ditch
  9. Great Black Swamp Program Area in BLUE WLEB Watershed Two-Stage Ditch
  10. Grant Details: Process 1. SWCD or County Engineer submits application before deadline. 2. ODA-DSWC Engineers review application and project details using internal metrics. a. Internal metrics include length, watershed area, cost per foot, structures, grades, existing conditions, etc. b. Applicants may revise grant details after discussing project with ODA-DSWC engineers. 3. ODA-DSWC Chief approves or rejects application based on recommendation of ODA-DSWC Engineers or availability of funds. 4. Requested funds are encumbered at ODA for approved projects until construction is completed. 5. Applicants submit final, stamped engineering plans to ODA-DSWC Engineers for concurrence of final design. 6. After construction is completed, applicants submit final As-Built plans and itemized bills of project. a. Itemized bills must separate 2S/SF ditch sections from non-2S/SF ditch sections. b. 2S/SF ditch section bills may include earthwork, structures, billed time, etc. c. Bridges and other crossings in 2S/SF ditch sections are not eligible bills for this grant. 7. ODA awards funds up to the encumbered amount or 2S/SF ditch section bills, whichever is less. 8. ODA tracks projects stats and works with research professionals, if possible, to track water quality benefits. Two-Stage Ditch
  11. Two-Stage Ditch Regional Curve Design • For the Northwest Ohio region, the “Agricultural Ditches (IN, MI, OH) Regional Curve” is generally considered appropriate for two-stage design on agricultural ditches. • Other curves or design methods may be considered on a case-by-case basis with proper supporting documentation submitted with the application. Agricultural Ditches Regional Curve Equations 𝑾 = 𝟔. 𝟗 ∗ 𝑫𝑨𝟎.𝟒𝟐 𝑫 = 𝟏. 𝟎 ∗ 𝑫𝑨𝟎.𝟑𝟐 • W=inset channel top width • D=inset channel depth • Total bench width should be 3W to 5W (floodplain width)
  12. Quick Notes on the Equations • Benches do not need to be the same size, but we do not recommend one- sided construction. • Current channel size will probably be different from inset channel size. • Flooded width sizes are guidelines and can be adjusted by +/- 25%. • Depth should be based on weight of evidence evaluation. Suggest not making mean inset channel depth more than a 0.1 ft deeper than equations unless there is compelling evidence. Making them a few tenths of a foot shallower should not be a problem.
  13. Self-Forming Ditch Regional Curve Design • The two-stage ditch equations can be rearranged using some assumptions to develop an equation for the design bottom width of a self-forming channel (overwide trapezoidal ditch). • Assumptions: Side slopes = 2:1 and choose a floodplain ratio (3:1, 4:1, or 5:1) Self-Forming Ditch Equations 𝑩𝑾𝟑:𝟏 = 𝟐𝟎. 𝟕 ∗ 𝑫𝑨𝟎.𝟒𝟐 − 𝟒 ∗ 𝑫𝑨𝟎.𝟑𝟐 𝑩𝑾𝟒:𝟏 = 𝟐𝟕. 𝟔 ∗ 𝑫𝑨𝟎.𝟒𝟐 − 𝟒 ∗ 𝑫𝑨𝟎.𝟑𝟐 𝑩𝑾𝟓:𝟏 = 𝟑𝟒. 𝟓 ∗ 𝑫𝑨𝟎.𝟒𝟐 − (𝟒 ∗ 𝑫𝑨𝟎.𝟑𝟐) BW=Bottom width of overwide trapezoidal ditch (assumes 2:1 side slopes).
  14. Internal Goals: • $5 million initial allocation • 20 Total Projects • 30 Total Miles • Average cost of $30 per foot Note: These internal goals were made using the above assumptions. However, two-stage ditch projects can vary greatly in cost, so final numbers may be significantly different. Future signups will be dependent on initial program success and available funds.
  15. Questions or Comments? Justin L. McBride, P.E. Conservation Engineer Ohio Department of Agriculture (419) 614-0459

Hinweis der Redaktion

  1. The first 7 practices can be implemented at the field level, so ODA is pursuing these practices first.