1. How do we
crack this nut?-
the ongoing
Nutrient saga
Dave Wilson, City of Dayton
Jason Tincu, Brown and
Caldwell

2. Threats
 Health and Wellness
 Recreation, Tourism, Fishing
 Water Supplies
 Inflation of Water and Sewer Rates
 Finite Supply of Raw Phosphorus
 Future Generations

3. Where does it come from?
 Agriculture
 Stormwater
 Wastewater
 CSOs/SSOs
 Industrial Sites
 Homes

4. What do we know?
 In Stream Nutrient Concentrations
 Stream Flows
 POTW Loadings
 Limits of Technology (LOT) at POTWs
 Costs Associated with LOT
 Climate Change Effects

5. What do we NOT know?
 Site Specific Loadings for Ag
 Manure and Fertilizers
 Site Specific Practices
 Field Tiles
 Edge of Field Technologies
 Cover Crop/No Till
 Lake Erie TMDL
 Statewide Mass Balance

6. How we are currently
attacking nutrients (mainly P)?
 P is normally the limiting nutrient
 Trying to squeeze a dollar out of 2 dimes
 Bulk of efforts aiming at ~20% of load
 Through POTW discharge reductions
 Lake Erie DD at 0.7 mg/L
 Loose, sparsely-regulated Western Basin
bans
 Relying on education, hope (and shaming)
for Ag reductions

7. Is this approach effective?

8. What are we leaving on the
table?
 Impactful Ag gains
 Reduction of in-soil mandate (2xs)
 Edge of field practices
 Smarter Hydraulic Controls
 Creative Permitting Options
 Use of Water Quality Trading
 Point to Point Trading
 Bubble Permits

9. How do we get there?
 Paradigm shift
 Get involved and take a stand
 Have a voice and speak it
 Creative permitting and Ag progress
 Through Confluence ideas and
technologies

10. Thanks!
Dave.wilson@daytonohio.gov
Jtincu@brwncald.com