Watering Durham s Schools: A Rainwater Harvesting Finance Program Scenario
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1 Watering Durham s Schools: A Rainwater Harvesting Finance Program Scenario Greenprints Urban Sustainability Sessions Stacey Isaac Berahzer March 14 th, 2013 Georgia Tech Research Institute Conference Center Atlanta, GA
2 Dedicated to enhancing the ability of governments and organizations to provide environmental programs and services in fair, effective and financially sustainable ways 2
3 Outline Introduction Durham Public Schools Case Study Financing Mechanisms Barriers and Boosters Photo by Erin Weeks: Two cisterns located at the NC Botanical Gardens in Chapel Hill, NC
4 INTRODUCTION Western Carteret, NC Fire Department
5 Background Objective: Research Financing options for alternative water supplies for utilities Methods: Included interviewing experts, selecting a case study locale; conducting a costbenefit analysis to assess various finance scenarios Twist: During interview process, we discovered that conservation is not the main driver of rainwater harvesting in North Carolina
6 Location of Durham, NC 6
7 About Durham, NC Falls and Jordan lakes are classified as impaired water bodies
8
9 Developing a costeffective Stormwater Mitigation Strategy (Distributed Green Infrastructure!) Compliance with the City s National Pollutant Discharge Elimination System (NPDES) permit requirements Reducing potable water use for outdoor water use Drivers for Cities Storm drain overflowing during heavy rain on University Dr. in Durham, North Carolina (2005)
10 Bolin Creek, Chapel Hill DURHAM PUBLIC SCHOOLS CASE STUDY
11 Alternative Finance Mechanisms for Rainwater Harvesting Option 1: Property owner self-financed Option 2: Utility incentive-share program Other finance mechanisms UNC s LEED-certified North Carolina Botanical Gardens Facility. Note the roof water catchments that are used to irrigate gardens
12 Model Assumptions 10,000 gallon tank Outdoor water use only Water supply demand balance calculated Capital cost ($2.50 per stored gallon) Incentive amount 15% of capital costs Water charge based on Durham water price Delayed capacity expansion Avoided capacity costs O&M ($2.75 / thousand stored gallons) Stormwater fee rate based on Durham actual Public stormwater reduction savings Environmental benefits of water left in rivers / lakes etc. And more.
13 1. Self Finance: Financial Metrics IRR: 3.09% Annual Monetary savings ($ / year) $ 401 Poor financial prospects NPV: ($2,123) Payback (years) 9 Capital Cost: $ 25,000 Total Water savings (gallons) 1,950,000 Based on: 1 School 10,000 gallon tank City of Durham Water and Stormwater Rates *Many other assumptions, see report for details
14 2. Utility Cost-share Program: Utility Perspective Financial Metrics IRR: 21.7% Benefit Cost Ratio: 1.18 NPV: $ 4,425 Payback (years): 5 Annualized Cost ($ / year): A rosier $ 3,720 financial Annualized Benefit ($ / Annualized Water year): $ 4,373 savings (MG / yr) 1.95 picture for both Property owner (School District) Perspective parties Annual Monetary savings IRR: 6.5% ($ / year) $2,734 NPV: $1,448 Payback (years) 8 Total Water savings Capital Cost: $21,250 (gallons) 1,950,000 *Based on 1-school model, 10 kgal tank, & many other assumptions, see report for details
15 Other Financing Mechanisms On-bill financing and repayment Third party ownership of the cistern system (where the private 3 rd party investor provides the initial capital for the system) Loan fixed to the property Others?
16 BARRIERS AND BOOSTERS 16
17 Barriers - Institutional Stormwater and water/sewer utilities remain silo-ed impedes integrated water resource management Regulatory system not mature yet Utilities want to avoid risks related to rainwater harvesting systems
18 Boosters - Current Programs in NC NC Division of Water Quality stormwater credits Allows property owners to increase built out area for new development. Community Conservation Assistance Program (CCAP) Reimburses property owners for up to 75% of qualified water quality protection BMP projects 18
19 Acknowledgements RBC Blue Water Fund Water Resources Research Institute City of Durham EFC Project Team: Dr. Christine Boyle, Daniel Kolomeets-Darovsky, Dr. Lauren Patterson 11 rainwater harvesting experts interviewed 19
20 Stacey Isaac Berahzer Download the full report at:
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