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example of different tier systems. For instance, a two-tier Incentive Programs and the Role of the Internet system can be used to distinguish detached and attached With improved impervious area data and the ability to show dwelling units. A three-tier system can be used to defi ne mapping of that data over the internet comes the ability to small, medium, and large dwelling units. Alternatively, tiers more fi nely tune incentive programs, and give property own-can be expressed in increments of 1,000 square feet. While ers direct access to impervious area information that forms tiers generally apply to single residential properties, a tiered the basis for determination of their fees and credits. rate structure can be applied to all properties up to the up-Incentive programs generally come in two forms, with per limit, for which all impervious area would be used to many variants based on local program needs and priorities: determine the charge. For example, if a large number of non-• Stormwater fee revenues are sometimes used to fund one-residential properties fall below a tier system’s upper limit, time grants or rebates to defray the upfront construction the charge for these properties can be cost of installation of stormwater facilities. Examples based on the tier system. The rate (dol-Figure 3. Breakdown of include Portland, OR’s Community Watershed Stew-lars per ERU) for each tier would have Montgomery County, MD, CIP ardship Grants program; Washington DC’s River-to be evaluated in order to generate suffi cient revenues. To achieve MS4 permit require-ments for treating impervious area and reducing pollutant loads, incentive programs (i.e., one-time rebates or an-nual credits) can help property owners reduce their annual charge while re-ducing stormwater runoff. More storm-water utilities are expanding incentive programs to include residential proper-ties. Further, the types of facilities eli-gible for credits are being updated to include LID facilities. PROJECT PROFILE: Stormwater Detention PROJECT NAME: PRODUCT USED: TOTAL WATER STORED: LOCATION: PROJECT DESCRIPTION: Paint Branch High School 11'-4" DoubleTrap Burtonsville, MD ® 212,504 cubic feet StormTrap was chosen to manufacture a stormwater detention system for a new high school in the City of Burtonsville. To help meet local municipal stormwater requirements, StormTrap’s DoubleTrap detention system was installed. The system stores over 200,000 cubic feet of stormwater runoff and then is released at a controlled rate. ® ® www.STORMTRAP.com 1-87-STORMTRAP 1-877-867-6872 Copyright © 2011 StormTrap. StormTrap, SingleTrap and DoubleTrap are registered trademarks of StormTrap. U.S. Patent Numbers: 6,991,402 B2; 7,160,058 B2; 7,344,335