Stormwater Utility FeeCredit and Incentive Program

Training

September 19, 2013

Agenda

Introductions Credit & Incentive Manual Organization Stormwater Utility Fee Overview Credit & Incentive Program Description Credit & Incentive Examples Program Administration Website Information Questions

Manual Organization

1. Background2. Definitions3. Stormwater Utility Fee4. Credit & Incentive Policies5. Incentive Criteria6. Credit Criteria7. Examples8. Forms

Stormwater Utility Fee

Impervious area based rate structure Relates developed surfaces to impact on runoff Easily understood by customers Defensible Can be mitigated

/ lost to atmosphere

Imperviousness

Imperviousness

Imperviousness

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

Impe

rvio

us A

rea

(sq

ft)

Percent of Sampled Parcels with Less Impervious Area

Mean = 3100 square feetMedian = 3010 square feet

0 20 40 60 80 100

Imperviousness

Imperviousness

24

78

76

22

0% 20% 40% 60% 80% 100%

Impervious Area

Parcels

Single FamilyNon‐Reidential

(sq ft)

What Are Stormwater Fee Credits?

A stormwater user fee credit is a reduction in stormwater fees charged to a qualifying property in return for implementing qualifying on-site stormwater management controls and/or activities

A stormwater user fee credit is an acknowledgement that on-site stormwater management may:

reduce the city’s operational costs reduce the city’s compliance costs reduce the city’s capital costs

How do credits work?

Direct reduction of user fees

Applied after user fees are calculated

On-going

Maximum credit of 50%

Not available to single family residential and duplex properties

Must be applied for; Qualifying criteria set by the city Maintenance of stormwater controls required

How do incentives work?

One time disbursement - $300 maximum per parcel

Partially compensate property owner for partnering with City to achieve a stormwater management objective

First come first served basis until budgeted funds exhausted – will have to apply for incentive next fiscal year.

Available to all properties. Cannot receive incentive if also receiving a credit

Must be applied for; Qualifying criteria set by the city Installation to be verified by City

Urbana Credit and Incentive Program

Credit & Incentive Plan

Single Family & Duplex Properties

Non-ResidentialProperties

1. Rain Barrel $25 – Incentive $25 – Incentive2. Rain Garden $250 – Incentive $250 – Incentive3. Rate Reduction $250 – Incentive 20% - Credit4. Volume Reduction $250 – Incentive 20% - Credit5. Water Quality $250 – Incentive 10% - Credit6. Direct Discharge N/A 50% - Credit 7. Education N/A $5 per Student

Credit Limits

Incentives – Rain Barrel

Rebate of $25 per barrel

Limit of two barrels per property

Must be purchased at pre-approved supplier in Urbana(Farm ‘N Fleet and F/S)

Rebate at time of purchase

Eligible every 10 years

Incentives – Rain Garden

Reimbursement of up to $250

100 sq-ft minimum size

Minimum of 500 sq-ft of drainage area

Must drain in 24 hours

Prorated incentive amount for size down to 50 sq-ft

Incentives – Rain Garden (Continued)

Design must be approved by City

Installation verified by City

Not eligible for any other incentives other than rain barrels for a period of 10 years after installed

Incentives – Others

Reimburse 25% of costs

Maximum reimbursement of $250

Must meet one of following criteria:

• Peak flow (rate) reduction• Volume reduction• Water quality

Cistern

Incentives – Others (Continued)

Permeable Pavement

Stormwater Management Activity Incentive Category

Permeable Pavement Peak Discharge/ Water Quality

Cistern Volume Reduction

Green Roof Volume Reduction/ Peak Discharge /Water Quality

Bioswale/Rain Garden Peak Discharge/Volume Reduction/Water Quality

Detention Basins Peak Discharge/ Water Quality

Manufactured Best Management Practices

Peak Discharge/Volume Reduction/Water Quality

Infiltration Basins Peak Discharge/Volume Reduction/Water Quality

Stormwater Features That Qualify for Incentives

Incentives – Others (Continued)

Green Roof

Minimum of 500 sq-ft of drainage area

Design must be approved by City

Installation verified by City

Not eligible of any other incentives other than rain barrels for a period of 10 years after installed

Runoff Rate Reduction Credits

Up to 20% Credit

Detention basins must be designed to capture 100 year design storm with a release rate of the 5 year pre-development storm

Detention basins, permeable pavement, and bioswales must be designed to capture “first flush” (1-inch rainfall event)

Detention Pond

Runoff Rate Reduction Credits(Continued)

Detention basins - prorated credit is available based on the percentage of total site area that is tributary to the basin

For permeable pavement and bioswales a prorated credit is available based on the fraction of 1 inch of rainfall treated and on the fraction of the total impervious area of the property that is captured

Permeable Pavement

Runoff Rate Reduction Credits(Continued)

Must drain in 24 to 48 hours

Calculations and drawings must be prepared by a Professional Engineer

Design must be approved by City

Installation verified by City

Bioswale

Volume Reduction Credits

Up to 20% Credit

Prorated credit based on the fraction of 1 inch of rainfall treated and on the fraction of the total impervious area of the property captured.

Must drain in 72 hoursCistern

Volume Reduction Credits(Continued)

Rainfall Depth (inches) Proration

0.00 – 0.19 0%

0.20 – 0.39 20%

0.40 – 0.59 40%

0.60 – 0.79 60%

0.80 – 0.99 80%

1.00 & over 100%

Rainfall Proration Table

Bioswale

Volume Rate Reduction Credits(Continued)

Calculations and drawings must be prepared by Professional Engineer

Design must be approved by City

Installation verified by CityGreen Roof

Water Quality Credits

Up to 10% credit

Can be added to rate or volume credits

75% reduction in total suspended solids on an annual basis

Prorated based on fraction of impervious area treated – 20% minimum

Water Pollution

Water Quality Credits (Continued)

Calculations and drawings must be prepared by a Professional Engineer

Design must be approved by the City

Installation must be verified by the City

Stormwater Screen

Direct Discharge Credits

Up to 50% Credit

Must discharge directly to sewer infrastructure or creek not maintained by City (Saline Branch and McCullough Creek)

Prorated based on fraction of area direct discharged

Saline Branch

Education Credits

$5 per student

Maximum 50% Credit

Local K-12 Institutions

Curriculum must be approved by City

Limited to number of enrolled students in target audience, e.g. 5th grade

Urbana Middle School Students

Detention Example

Detention requires design for 5, 50, 100 year storms Existing pond volume is 5.0 acre-feet

Detention Example

Credit requirements are:a. Outflow ≤ 5 yr pre-development rate for 5, 50, 100 yrb. First flush (1”) is retained for 24-48 hours

100% of site drains to pond 100-year volume for existing requirement is 4.2 ac-ft 100-year volume for 5-yr discharge is 4.85 ac-ft First flush storage volume is computed as 1.20 ac-ft No additional storage needed for credit Outlet reconfigured to manage 100 and 50 year storm

volumes and to detain first 1.2 ac-ft for at least 24 hours Credit: Rate reduction and water quality

100% ● (20% + 10%) = 30%

Rain Garden Example

Single family Roof = 1440 square feet Rain garden for back half of roof Roof area = 720 square feet Rain garden volume = 60 cubic feet Rain garden depth = 5 inches (avg) Rain garden size = 60 / (5/12)

= 144 sq ft Incentive = $250 Considerations: soils

setbackplanting plan

Bioretention Example Restaurant 1.00 acre 0.67 acres impervious area Infiltration rate: 0.33 in/hr (Type B/C)

1” storm volume = 2,370 cu ft(3630 ● Cff ● site area)

Average width = 8.0 feet Average depth = 2.0 feet Required length = 148 feet

Cff = 0.05 + 0.009 ● IAIA = impervious percent of drainage area

Bioretention Example Recovery Infiltration surface = (1+8) ● 148

= 1,332 sq ft Infiltration (72 hr) = 2,637 cu ft 72 hour recovery confirmed

Credit: volume and water qualityimpervious fraction 1.0precipitation factor 1.01.0 ● 1.0 ● (20% + 10%)30%

Considerations: soilsproximity to drains

Permeable Pavement Example

Permeable Pavement Example

Property Characteristics 1.08 acres: 0.39 ac permeable, 0.51 ac asphalt Infiltration rate: 0.33 in/hr (Type B/C soil)

Design Characteristics Stone bed porosity: 40% (#8 washed stone) Stone bed unit storage: 1’ 0.156 ac-ft First flush (1”) runoff: = 3,630 ● Cff ● (0.39 + 0.51)

= 3,104 cu ft = 0.071 ac-ft 5.45” stone

For 100% impervious drainage area assume Cff = 0.95

Permeable Pavement Example

Storage Recovery Infiltration surface area: = 0.39 ● 40% = 0.156 ac Drawdown per day: = 0.156 ● (0.33 / 12) ● 24

= 0.103 ac-ft 24-48 hour recovery confirmed

Credit: Rate reduction and water qualityImpervious area fraction = 1.01.0 ● (20% + 10%) = 30%

Considerations: soilsunderdrainwater tabledetention requirements

Green Roof Example

Site: 1.30 acres 0.45 ac parking 0.34 ac rooftop 98 rooftop CN

Green roof 6” plant media 86 rooftop CN 43% impervious

area on rooftop

CN = Curve Number

Green Roof Example

Structural evaluation of roof support required Use NRCS Curve Number hydrology CN decreases by 2 per inch of media Based on 1” storm Rooftop runoff volume (existing): 0.022 ac-ft Green roof storage volume: 0.082 ac-ft

Credit: rate and volume reduction and water quality43% ● (20% + 20% + 10%) = 21.5% for site

Considerations: lower CN for green roof lessens storage requirement for site

NRCS = Natural Resource Conservation ServiceCN = Curve Number

Credit Application Process

Download current credit application forms from City website (http://urbanaillinois.us/Stormwater_Utility_Fee) or obtain the forms directly from the City of Urbana Public Works Department

Prepare general credit application form. Prepare credit-specific application form(s). Prepare or locate required site drainage plan showing

topography, drainage patterns, and contributing area to each stormwater management structure

Prepare technical calculations required to determine applicability of credit(s)

Obtain appropriate signatures on forms

Credit Application Process (Continued)

Submit forms and required attachments to the Public Works Department.

City will check to insure submittal is complete and notify the applicant

City will review application within 30 to 45 calendar days and notify the applicant of credit determination, including identification of deficiencies if the application is not approved

If credit is denied applicant may address identified deficiencies and resubmit the revised application

If credit is denied applicant may appeal the determination following guidelines in Section 24-204 of the Urbana City Code

Credit Application Form

Section 24-204

Appeals1. Owner files an appeal accompanied by information

substantiating claim.2. First appeal is reviewed by Public Works staff. A

recommendation is made to the Director. Response is in 30 days or less.

3. Second appeal is made to Director of Public Works. Response is in 15 days or less.

4. Third appeal is to Mayor. Response is in 15 days or less.

Incentive Application Process

Download current Incentive Application Form from the City website (http://urbanaillinois.us/Stormwater_Utility_Fee) or obtain the form directly from the City of Urbana Public Works Department

Prepare Incentive Application Form Submit form and attachments (if required) to the Public

Works Department City will check to insure submittal is complete and notify

applicant City will review application within 30 to 45 calendar days

and notify applicant of incentive determination, including the deficiencies if the application is not approved

Incentive Application Process (Continued) If the incentive is denied applicant may address identified

deficiencies and resubmit a revised application If an incentive is denied applicant may appeal the

determination following guidelines in Section 24-204 of the Urbana City Code

Incentive Application Form

Questions ????

Download the Credit and Incentive Manual http://urbanaillinois.us/Stormwater_Utility_Fee

Contact

Urbana Department of Public Works217-384-2377http://urbanaillinois.us/citizens-voice

Download the Credit and Incentive Manualhttp://urbanaillinois.us/Stormwater_Utility_Fee