Pennsylvania Stormwater Best Management Practices Manual

[Pages:45]Pennsylvania Stormwater Best Management Practices Manual

Presented by the Pennsylvania Department of Environmental Protection

Bureau of Watershed Protection

In cooperation with: Cahill Associates

Environmental Consultants Stormwater Oversight Committee Villanova Urban Stormwater Partnership

Stormwater information (manual revisions, meetings, training, etc.) will be posted on the DEP Stormwater page ? DEP Keyword:

"stormwater" ? General information ? Stormwater Oversight

committee



Draft Stormwater Best Management

Practices Manual

? Cover and Table of Contents ? Section 1 - Introduction and Purpose of BMP Manual ? Section 2 - Stormwater and PA's Natural Systems ? Section 3 - Stormwater Management Principles, Goals, and a Management Model ? Section 4 - Comprehensive Stormwater Management: Integrating Site Design,

Non-Structural, and Structural BMP's ? Section 5 - Comprehensive Stormwater Management: Non-Structural BMP's ? Section 6 - Comprehensive Stormwater Management: Structural BMP's ? Section 7 - Stormwater Management for Special Areas ? Section 8 - Stormwater Calculations and Methodology ? Section 9 - Case Studies Innovative Stormwater Management Approaches and

Practices

? Appendix A - Water Quality ? Appendix B - Pennsylvania Native Plant List ? Appendix C - Soil Infiltration Testing, System Design

and Construction Guidelines ? Appendix D - Case Study with Stormwater Calculations

Chapter 1 Introduction & Purpose

? To improve stormwater management throughout Pennsylvania.

? Emphasis on water quality and water resources.

? Describes management methods and practices that can prevent, reduce, and mitigate the impacts of stormwater.

Stormwater Management

? Relationship Land Use and Water

? Integrated Approach

ACT 167 Planning

Program

? Manage Stormwater:

? Volume ? Water Quality

Construction NPDES Permits

COMPREHENSIVE SW

POLICY

? Peak Rate

? Groundwater Recharge ? Stream Impacts

BMP Technical Manual

NPDES Phase II MS4 Permits

Chapter 2

Stormwater and Pennsylvania's Natural Systems

? Hydrologic Cycle. ? Pennsylvania Rainfall: Avg. 36" to 44". ? Impacts of Development and Impervious Surfaces. ? Water and Environmental Quality. ? Pennsylvania Watersheds, Soils, Geology.

Stormwater Impacts

? Increased Runoff Volume ? Compacted Soils ? Erosion and Stream

Channel Changes ? Decreased Base-flow ? Pollutants and

Temperature Impacts

? Decreased Evapo-transpiration and Groundwater Recharge

? Increased Frequency of Runoff Events

? Faster Conveyance of Water

? Impacted Aquatic Life

SOIL

WATER TABLE (DEVELOPED CONDITIONS)

STREAM BEDROCK

WELL

AQUIFER

Cahill Associates

Environmental Consultants

Green Valleys Association

Chapter 3 Stormwater Management

Principles and Goals

Recommended Site Control Guidance:

? Comprehensive ? Watershed; Hydrology. ? Effective ? Prevents impacts. ? Equitable ? New and re-development. ? Flexible ? Variable conditions; Creative.

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