Guidance from the regulators on various methods to gauge impact of stormwater controls, especially non-structural. Little guidance on trees specifically, but broad coverage of both simple and complex modeling techniques.
This EPA Green Infrastructure modeling tool supports planning and design decisions for site designers, planners, or environmental managers on a range of scales. Scales range from setting a green infrastructure target for an entire watershed to designing a green infrastructure practice for a particular site or an entire watershed. Some models can predict the water quality and water quantity impacts of green infrastructure approaches. These models cannot only predict the cost for green infrastructure but also benefits such as improvements in air quality and reduction of energy consumption. These models range from simple to complex.