A low impact development approach is when stormwater is managed on-site and the rate and volume of predevelopment stormwater reaching receiving waters is unchanged. On this website the low impact development approach is described: for citizens, policy, practices, case studies, funding availability, brownfield sites, and design standards.
This article presents the results of a study proving the effectiveness of using trees in bioswales. A bioswale integrating an engineered soil and trees was installed in a parking lot to evaluate its ability to reduce storm runoff, pollutant loading, and support tree growth. Storm runoff, pollutant loading, and tree growth were measured. The bioswale reduced runoff by 88.8% and total pollutant loading by 95.4%. The engineered soil provided a better aeration and drainage for tree growth than did the control’s compacted urban soil. The superior performance of the bioswale demonstrated its potential use for large-scale application in parking lots and roadsides to reduce runoff and support tree growth.
New Orleans has codified tree planting and mature tree protection in their landscape and stormwater ordinance
It is critical for local governmental entities to adopt sound, comprehensive stormwater management ordinances that incorporate best practices. IDNR/OWR and the Illinois State Water Survey (ISWS) developed a Model Stormwater Management Ordinance as a resource for counties and municipalities to use when drafting or revising their own stormwater ordinances. While local development, review, and approval processes are unique, IDNR/OWR provides this document as a template containing the minimum requirements for an effective ordinance and suggestions for more advanced stormwater protection. It particularly addresses tree protection and GI maintenance.
This Stormwater Management Model Ordinance was developed by the Virginia Department of Conservation and Recreation Department for use by a locality for establishing a Virginia Stormwater Management Program consistent with the Virginia Stormwater Management Act. While specific to Virginia, this document can provide guidance and information for localities developing stormwater management programs.
A streamlined factsheet describing the uses, design options and benefits of linear stormwater tree pit. These stormwater tree pits are similar to traditional street tree pit design, but are modified so the pit accepts and treats stormwater runoff and provides an improved planting environment for the tree.
The EPA hopes to inspire community leaders to use green infrastructure by providing practical and successful ways to improve community cohesion, the natural environment, and residents’ health. The report summarizes different types of GI and the benefits of these approaches. The report then summarizes how communities can save money by using GI in public projects. It goes on to detail how GI can also be incorporated into private development. Establishing design guidelines is one way to influence private development. To implement these kinds of policies GI benefits must be clear articulated to decisionmakers. The report includes examples of how some communities showed how GI could increase household energy savings, reduce greenhouse gas emission, and create jobs. Additionally, it is important for communities to prioritize projects to maximize benefits. Lastly the report provides a wide range of examples from across the country and addresses water management issues for both the Eastern and Western United States. A list of all the projects associated with the program are presented at the end of the report under 6 broad categories: conceptual design, guidance development, policy review/recommendations, screening and prioritization, modeling and economic benefits.
This report addresses the fact that the impacts of stormwater pollution and the need to provide stormwater prevention, management, and treatment all create costs for communities and their residents. But provides data and case studies that show these costs can often be offset or reduced by making different choices about how we build communities and infrastructure. By incorporating trees and “green infrastructure” practices in efforts to control stormwater runoff, communities and property developers can reduce energy costs, diminish the impacts of flooding, improve public health, and reduce overall infrastructure costs.
This report develops a range of green infrastructure scenarios consistent with the constraints of a recently remediated brownfield that can be implemented within the framework of a 15- to 20-year development master plan. There are collections and descriptions of key findings during the exploration of this topic that can be applied to the Zidell site and other redevelopment projects of similar character. The conceptual design scenarios apply green infrastructure solutions that capitalize on infiltration and innovation for the remediated brownfield site with the goal of exceeding existing regulatory requirements for stormwater management and providing creative solutions with multiple community benefits.
This recently updated manual offers extensive justifications and guidance for protecting trees and forests during development and offers a set of tools for incorporating trees and trees canopy into stormwater planning. Since many of the recommended actions recommended require additions or revisions to local codes and ordinances, information is provided for code changes that communities can make if their codes are currently “silent” on or in conflict with tree and forest protection. Digital design drawings of green BMPs for trees are also provided on the website.