Improving Water Quality with Green Infrastructure a Sustainable Framework for Growth and Development in the Central Midlands Region
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ImprovingImproving WaterWater QualityQuality WithWith GreenGreen InfrastructureInfrastructure A Sustainable Framework for Growth and Development in the Central Midlands Region CENTRAL MIDLANDS Council of Governments Th is Page Intentionally Left Blank Improving Water Quality with Green Infrastructure A Sustainable Framework For Growth and Development In the Central Midlands Region Adopted by the Central Midlands Council of Governments Board of Directors on October 27, 2011. Project Sponsors Th is project was conducted with support from the US Environmental Protection Agency (EPA) and the South Carolina Department of Health and Environmental Control (SCHEC) through the 604(b) Statewide Water Quality Management Program. Funding was provided through this program by the American Recovery and Reinvestment Act (ARRA). Acknowledgements Th is document was made possible with invaluable contributions from a number of individuals and organizations who served as an informal steering committee to help guide the development of this project: • Carolina Clear • Richland and Lexington Countywide Stormwater Consortiums • Richland County Department of Public Works • Lexington County Department of Public Works • City of Columbia Planning Department • Newberry County Planning and Zoning • Fairfi eld County • Irmo Chapin Recreation Commission • City of Aiken • CMCOG Transportation Planning Program A special thank you is extended to the South Carolina Department of Health and Environmental Control for their assistance with this project and their continued support for the Central Midlands 208 Water Quality Management Program. About Central Midlands Council of Governments (CMCOG) Created in 1969, CMCOG is a regional planning organization, which provides a forum in which local offi cials can work to resolve issues that transcend their own political boundaires. CMCOG currently consists of 14 member governments and serves in excess of 680,000 people in four midlands counties of Fairfi eld, Newberry, Richland and Lexington. CMCOG works to develop area-wide plans and programs for addressing a wide range of issues that collectively aff ect local governments such as: regional urban & rural transportation plan- ning; environmental and land use planning; community and economic development; workforce development; and aging services. CMOCG Staff also provides a wide of variety of research, plan- ning and technical assistance to local governments, writes and administers a variety of grants, and serves as the Area Agency on Aging/ Aging & Disability Resource Center and the Long Term Care Ombudsman for the Central Midlands region. Contents Introduction 7 Purpose and Intent 9 Organization 11 Intended Audience 11 A Primer on Water Quality Planning 13 Watersheds 14 Th e Hydrologic Cycle 14 Impacts of Development 14 Types of Pollution 15 Th e Clean Water Act 17 An Overview of Green Infrastructure 23 A Defi nition of Green Infrastructure 24 Th e Benefi ts of Green Infrastructure 27 Implementing Green Infrastructure 29 A Green Infrastructure Toolbox 31 Green Infrastructure Policies and Programs 32 Site Specifi c Green Infrastructure Techniques 54 Green Infrastructure Case Studies 77 City of Aiken 78 University of South Carolina Green Quad 80 Saluda Shoals Park Constructed Wetland 82 Noisette Community Master Plan 83 Arcadia Lakes Tree of Life Rain Garden 85 Town of Fairbluff , NC: Lumber River Riverwalk 86 Th is Page Intentionally Left Blank Putting Green Infrastructure To Work In The Central Midlands Region 89 A Watershed Based Approach to Regional Planning 91 Regional Green Infrastructure Concept 98 Concept Plan for an Impaired Watershed 100 Selected References 103 Key Terms 107 Appendix A: Model Comprehensive Plan Language 112 Appendix B: Model Conservation Subdivision and Incentive Zoning Provisions 117 Appendix C: Report on CMCOG Wetlands Mitigation Banking Activities 123 Introduction In his 2005 book Infrastructure: A Field Guide to the Industrial Landscape, author Brian Hayes presents for the reader an informative and illustrative guidebook for identifying and understanding the everyday features of the built environment (i.e., the roads, dams, water and sewer systems, electrical grids, and other engineered structures that support our soci- ety). His purpose in writing the book was to cultivate in the reader a greater awareness, appreciation, and enthusiasm for all of the “miscellaneous hardware that goes into making a civilization.” He further explains that such a fi eld guide should provide more than just basic information for identifying this hardware, but it should ultimately lead to a better understanding of how the individual elements of this engineered landscape fi t together as a “coherent whole.” Th is perceived lack of a general under- ported away from its source as quickly standing of the engineered aspects of our and effi ciently as possible. Th is is typically daily lives suggests that for too long we accomplished in an urban environment by have thought of infrastructure as some- a complex conveyance system of under- thing that is essential to our existence, but ground drains and pipes that eventually ultimately not in harmony with the natu- discharge directly into a natural drainage ral and cultural landscapes in which we system or water body with little or no prior live. We have therefore made it a prior- treatment. ity to hide this infrastructure from view and regulate its incompatibilities with Such systems typically drain impervious the cultural resources it supports and the surface areas and intensively managed natural resources it depends on. Th e word landscapes, such as parking lots and golf infrastructure itself, as many authors have courses, and as a result can contribute high pointed out, is based on a combination concentrations of chemicals, nutrients and of the Latin prefi x “infra” which means sediment to local water resources. Because “below” and the word “structure” which this infrastructure system is not highly visi- in this case refers to something that is ble, its positive functional value and nega- constructed or built for a specifi c civil tive water quality impacts go largely unno- purpose. By using this word to refer to ticed by the average citizen. the essential components of the built envi- ronment we are acknowledging its impor- So the question becomes, what can we tance to our existence, but at the same do to increase the public visibility of our time suggesting it should be placed under- infrastructure system and at the same time ground and out of sight. strengthen its relationship to the natural and cultural environment? Th e concepts Urban stormwater infrastructure provides of Green Infrastructure (GI) and Low a perfect example of this seemingly inher- Impact Development (LID), both of which ent tension within the built environment. are quickly becoming an integral part of Conventional stormwater management main stream planning and development techniques are based on the principle practice, off er a viable solution to these that stormwater runoff should be trans- issues. Many urban streams have been channelized and routed underground in order to make way for residential and commercial development. 8 A Green Infrastructure Plan for the Central Midlands Region Rain Gardens are a type of Green Infrastructure project that can provide wildlife habitat, aesthetic enhancments, and water quality improvements. Green Infrastructure for stormwater environmental regulatory agencies have management in particular, seeks to utilize expanded their outreach eff orts to encour- natural processes for retaining and treat- age local and regional governments to ing stormwater where it falls and by doing conduct green infrastructure planning and so creates a functional but aesthetically begin adopting green infrastructure prac- pleasing landscaped environment that tices. As a result, many local and regional can become a part of the public realm. entities across the country have developed Because such site design features add green infrastructure plans that have tradi- aesthetic value to a project rather than take tionally taken the form of informational away from it, the public can more easily be toolkits that describe common green infra- engaged in the planning and development structure practices and the environmental, process and as result become more aware economic and social benefi ts of their adop- of the relationship a building program tion. has to the natural environment in which it resides. Th e economic, social and envi- Purpose and Intent ronmental benefi ts of adopting GI and LID practices are numerous and can there- Th e purpose of the following document is fore greatly contribute to the building of to follow the lead set by the EPA by provid- community consensus around a sustain- ing a comprehensive source of general able, long-term vision for regional growth information on GI and LID Best Manage- and development. ment Practices (BMPs) for improving water quality in the Central Midlands Over the past decade, the US Environ- Region. Even though a wealth of this mental Protection Agency (EPA) and state information is currently available online from a number of authoritative sources Chapter 1: Introduction 9 such as the EPA, American Rivers and spread adoption of these concepts within the Center for Watershed Protection, it is each member governments own planning highly desirable to also have a local source and public works programs. of information where elected offi cials, planning commission members, private In addition to