1. Watershed Land Use Practices as a part of the
Iowa Nutrient Reduction Strategy Response for the City of Ames
John Dunn, Director

2. About the Ames Water Pollution Control Facility
20 MGD Trickling Filter/Solids Contact Facility
Built in 1989
29+ Years of Perfect Permit Compliance

3. Iowa NRS Goals Point Sources: Biological Nutrient Removal (BNR)
45% Reduction in Nutrients Leaving the State
Point Sources: Biological Nutrient Removal (BNR)
75% Phosphorus Reduction
67% Nitrogen Reduction
Phosphorus
Ames Current Performance: 19% Phosphorus Reduction 36% Nitrogen Reduction
Nitrogen

4. Infrastructure Investments
Media Inside

5. “Is There a Reasonable Nonpoint Source Component to our Facility’s Strategy?”

6. Conclusions of Feasibility Study
Wholesale technology replacement was only practical course of action.
Not practical for nonpoint practices to entirely offset the need for WPCF reductions.
The City has, and should continue, to pursue land use BMPs that provide nutrient reduction as ancillary benefits.

7. Two-Pronged Solution
Undertake Phased Construction of Technology Conversion at WPCF
Three phases over 20 years
Replaces existing infrastructure based on anticipated remaining useful life
Ultimately will meet goals of Iowa NRS (75% TP and 67% TN reductions)

8. Two-Pronged Solution
Undertake Phased Construction of Technology Conversion at WPCF
Three phases over 20 years
Replaces existing infrastructure based on anticipated remaining useful life
Ultimately will meet goals of Iowa NRS (75% TP and 66% TN reductions)
Invest in Urban and Rural BMP’s
Locations that benefit sewer rate payers
Quantifiable nutrient reduction
Ancillary benefits

9. Overall Project Cost & Rate Impacts
$39.9 million in capital work over 20 years
$4 million in watershed BMP’s over 20 years
Net sewer rate impact: %

10. Director, Ames Water & Pollution Control Department
John R, Dunn, PE, MBA
Director, Ames Water & Pollution Control Department