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Storm Water UtilityCity of Durand
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Storm Water Runoff
• Rainwater flows across streets, parking lots, driveways, lawns
• Pollutants are picked up by the storm water– Oils from cars & trucks.– Fertilizers/pesticides from lawns &
farms – Organics from grass & leaves– Salts and Sediments from street
maintenance.
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Storm Water Runoff
• Erosion of existing soils– Steep slopes left without vegetation– Construction site with no erosion
control
• Pollutants and Soils are carried to the Chippewa River.
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Why Treat Stormwater?
• Environmental Stewardship.• NR 151
– Redevelopment must remove 40% suspended solids. New Development must remove 80% suspended solids.
– Developed runoff rates must match the undeveloped rates.
– Developed infiltration volumes must meet capped percentages of undeveloped infiltration volume.
• NR 216– Currently, all communities larger than 10,000 or
more need a storm water discharge permit, similar to the WWTP discharge permit.
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Storm Water Funding Sources
Two primary methods of raising funds to install, support, and improve storm water systems:
• Property Taxes
• Storm Water Utility
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Property Taxes
• Pros:– Existing payment collection system.– Spreads costs by property value.
• Cons:– Some properties tax exempt.– Single family residential pays
disproportionately.– Current levy requirements make it difficult to
finance large projects.
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Storm Water Utility
• Pros:
– Costs spread by impervious area – “Users Pay”
» Burden is shifted away from single family residential properties.
» Burden is shifted toward commercial, industrial, and institutional properties.
– Operates like water or wastewater utility.
– Charges can be structured to provide incentives
• Cons:
– Perception of new charges
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Eligible Utility Costs
• Construction of storm water ponds.
• Maintenance of storm sewers.
• Maintenance of ponds.
• Street sweeping.
• Leaf collection.
• Erosion stabilization.
• Administrative costs.
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Process
1. Prepare a budget for capital improvements.
2. Prepare budget for proposed expenses (operation, maintenance, debt service).
3. Determine the average residential impervious surface square footage and the number of single family homes in the community.
4. Determine the impervious surface for all non-single family properties.
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Process, cont.
5. Determine how to distribute ERUs for multi-family residential.
Measured Individually? Standard Ratio?
6. Determine credit system for existing storm water management facilities.
7. Determine incentives for single family residential.
8. Create storm water utility ordinance and rate structure, and set up administrative requirements.
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Durand Funding Shares
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Budget
Proposed Budget Summary
Wages and Benefits $27,000
Operating Expenses $5,000
Equipment $6,600
Outlay $26,500
Total Proposed Budget $65,100
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Fee Structure
City of Durand
Customers will be divided into three classifications:
1. Single Family Residential
2. Full Multiple Residential
3. Nonresidential
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Fee Structure—Single Family Residential
The average impervious area for a single family residence, duplex unit, or three-plex unit in the City is approximately 3,300 square feet. Each
residential customer will be charged 1.0 ERU
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Fee Structure—Full Multiple Residential
Full Multiple Residential impervious surfaces will be measured off of aerial photography and divided by 3,300 SF. Customers will be charged the
resultant number of ERUs minus approved credits.
Examples:
34,000 SF/3,300 SF
=10.3 ERU
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Fee Structure—Nonresidential
Nonresidential impervious surfaces will be measured off of aerial photography and divided by 3,300 SF. Customers will be charged the resultant number of ERUs
minus approved credits.
Commercial and Industrial Examples
Examples:
Left:
207,800 SF/3,300 SF
=63.0 ERU
Right:
2,000 SF/3,300 SF
=0.6 ERU
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Fee Structure—Nonresidential
Nonresidential impervious surfaces will be measured off of aerial photography and divided by 3,300 SF. Customers will be charged the resultant number of ERUs
minus approved credits.
Institutional Examples
Examples:
Left:
238,236 SF/3,300 SF
=72.3 ERU
Right:
183,462 SF/3,300 SF
=55.6 ERU
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Total ERU
Land Use Impervious Surface ERU
Multiple Residential and Nonresidential
3,816,934 1,157
Single Family Residential (3 units or less)
2,151,600 652
Total 5,968,534 1,809
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Rate Calculation
Rate Calculation
Total Budget $65,100
Total ERU 1,809
Annual Rate per ERU $36.00
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Regional Examples
Community Annual Cost/ERU
Altoona $36.00
Barron $24.00
Chetek $27.00
Chippewa Falls $36.00
Eau Claire $62.00
Grantsburg $18.00
Menomonie $32.00
New Richmond $28.68
River Falls $37.68
Superior $70.80
Washburn $48.00
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Credit System
Credits for Available for Full
Multiple Residential and Nonresidential (Commercial,
Industrial, Institutional)
10% for modeled sediment removal
10% for modeled runoff volume control
20% maximum credit
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Proposed Implementation Schedule
Task Month
Review and Finalize Data May, 2010
Public Informational Meeting July, 2010
Adopt Summary of Charges July, 2010
Final Ordinance Approval August, 2010
Create Utility August, 2010
First Monthly Billing Begins September, 2010
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Storm Water UtilityCity of Durand
Questions?