DESIGN: LOW IMPACT DEVELOPMENT MANUAL
RECORD OF CHANGES - 3_210_100002
FOREWORD - 3_210_100003
CONTENTS - 3_210_100004
CONTENTS-continued - 3_210_100005
CONTENTS-continued - 3_210_100006
CONTENTS-continued - 3_210_100007
FIGURES - 3_210_100008
TABLES - 3_210_100009
CHAPTER 1. INTRODUCTION TO LID AND MANUAL OVERVIEW
BACKGROUND ON THE USE OF LID
LID SITE DESIGN STRATEGIES
BASIC LIST OF IMPs
Soil amendments
CHAPTER 2. INSTITUTIONAL ISSUES
CHAPTER 3. WATER RESOURCE PROBLEMS, ISSUES, AND CHALLENGES
Section 401. Certification and Wetlands
Safe Drinking Water Act Wellhead Protection Program
Energy Policy Act of 1992
VOLUNTARY PROGRAMS AND AGREEMENTS
RETROFITS-continued
CHAPTER 4. STORMWATER MANAGEMENT USING THE HYDROLOGIC CYCLE APPROACH
PRECIPITATION DATA
STORAGE - 3_210_100024
LID Storage Concepts
INFILTRATION - 3_210_100026
LID Infiltration Concepts
EVAPOTRANSPIRATION
CHAPTER 5. LID DESIGN GOALS AND OBJECTIVES
FUNDAMENTAL SITE PLANNING CONCEPTS
Utilize Multifunctional Landscape, Buildings and Infrastructures
LID MANAGEMENT AND DESIGN STRATEGIES
LID Design Approach
Control of Watershed Timing and Runoff Patterns
Use of Integrated Management Practices (IMPs)
DESIGN GUIDANCE AND STANDARDS
Prince George's County, Maryland
Monitoring Strategies
Monitoring Program
Sampling Protocols
CHAPTER 6. DISTRIBUTED MICRO-SCALE SYSTEMS
Table 6-1. Functions of LID Features
Treatment Train Approach to Water Quality
Ancillary Benefits
CHAPTER 7. COMPARISON OF LID TO CONVENTIONAL PRACTICES
OPERATION AND MAINTENANCE - 3_210_100046
CHAPTER 8. INTEGRATED MANAGEMENT PRACTICES
Table 8-1. Costs Associated with Soil Amending
Figure 8-2. Bioretention Area
DRY WELLS
FILTER STRIPS
VEGETATED BUFFERS
GRASSED SWALES
INFILTRATION TRENCHES
INLET DEVICES
Most Appropriate Uses - 3_210_100056
RAIN BARRELS
Maintenance Issues - 3_210_100058
TREE BOX FILTERS
VEGETATED ROOFS
Maintenance Issues - 3_210_100061
Most Appropriate Uses - 3_210_100062
PERMEABLE PAVEMENT
Figure 8-14. Permeable Pavement Cross-Section
DEVELOPMENT AND EVALUATION OF ADDITIONAL PRACTICES
CHAPTER 9. LID SITE PLANNING PROCESS
Step 3: Develop LID control strategies
Step 3: Develop LID control strategies-continued
Step 4: Design LID Site or Master Plan
Step 5: Develop Operation and Maintenance Procedures-continued
CHAPTER 10. DESIGN EXAMPLES
RANK AND PRIORITIZE OPPORTUNITES
LID DESIGN
Figure 10-4. Office Complex Retrofit
NEW HOUSING DESIGN
Curve Number Calculations For Existing Site Condition
Post Development Curve Number Calculations
Figure 10-6. Proposed Housing
LID Site Planning Strategies
Figure 10-8. Map of Proposed Conditions (LID Design)
Storage Volume Comparison
Distributed Detention And Retention Storage Requirements
Selection of Appropriate IMPs-continued
Figure 10-9. Street Island Modifications
Figure 10-10. Street Alterations
Figure 10-11. Trash Rack
Figure 10-12. Tree Box Filter
Figure 10-13. Bioretention (Rain Garden)
Figure 10-14. Reforestation
WATER QUALITY CALCULATIONS
APPENDIX A. REFERENCES - 3_210_100091
APPENDIX A. REFERENCES-continued - 3_210_100092
APPENDIX A. REFERENCES-continued - 3_210_100093
APPENDIX A. REFERENCES-continued - 3_210_100094
APPENDIX A. REFERENCES-continued - 3_210_100095
APPENDIX A. REFERENCES-continued - 3_210_100096
APPENDIX B. GLOSSARY: ACRONYMS AND ABBREVIATIONS
APPENDIX C. SUPPORTING CALCULATIONS FOR SECTION 10-2
Exhibit A. TR-55 Time of Concentration Calculation for Existing Condition
Exhibit C. TR-55 Detention Basin Storage Volume Calculation for Proposed Condition, Conventional Site Design
Exhibit D. TR-55 Detention Basin Storage Volume Calculation for Proposed Condition, LID Site Design
APPENDIX D. LID DESIGN CHARTS
Chart 1. Storage Required to Maintain Pre-Development Peak Runoff Rate using 100% Retention
Chart 2. Storage Required to Maintain Pre-Development Peak Runoff Rate using 100% Detention
Chart 3. Storage Required to Maintain Pre-Development Runoff Volume
3_210_10
RECORD OF CHANGES - 3_210_100002
FOREWORD - 3_210_100003
CONTENTS - 3_210_100004
CONTENTS-continued - 3_210_100005
CONTENTS-continued - 3_210_100006
CONTENTS-continued - 3_210_100007
FIGURES - 3_210_100008
TABLES - 3_210_100009
CHAPTER 1. INTRODUCTION TO LID AND MANUAL OVERVIEW
BACKGROUND ON THE USE OF LID
LID SITE DESIGN STRATEGIES
BASIC LIST OF IMPs
Soil amendments
CHAPTER 2. INSTITUTIONAL ISSUES
CHAPTER 3. WATER RESOURCE PROBLEMS, ISSUES, AND CHALLENGES
Section 401. Certification and Wetlands
Safe Drinking Water Act Wellhead Protection Program
Energy Policy Act of 1992
VOLUNTARY PROGRAMS AND AGREEMENTS
RETROFITS-continued
CHAPTER 4. STORMWATER MANAGEMENT USING THE HYDROLOGIC CYCLE APPROACH
PRECIPITATION DATA
STORAGE - 3_210_100024
LID Storage Concepts
INFILTRATION - 3_210_100026
LID Infiltration Concepts
EVAPOTRANSPIRATION
CHAPTER 5. LID DESIGN GOALS AND OBJECTIVES
FUNDAMENTAL SITE PLANNING CONCEPTS
Utilize Multifunctional Landscape, Buildings and Infrastructures
LID MANAGEMENT AND DESIGN STRATEGIES
LID Design Approach
Control of Watershed Timing and Runoff Patterns
Use of Integrated Management Practices (IMPs)
DESIGN GUIDANCE AND STANDARDS
Prince George's County, Maryland
Monitoring Strategies
Monitoring Program
Sampling Protocols
CHAPTER 6. DISTRIBUTED MICRO-SCALE SYSTEMS
Table 6-1. Functions of LID Features
Treatment Train Approach to Water Quality
Ancillary Benefits
CHAPTER 7. COMPARISON OF LID TO CONVENTIONAL PRACTICES
OPERATION AND MAINTENANCE - 3_210_100046
CHAPTER 8. INTEGRATED MANAGEMENT PRACTICES
Table 8-1. Costs Associated with Soil Amending
Figure 8-2. Bioretention Area
DRY WELLS
FILTER STRIPS
VEGETATED BUFFERS
GRASSED SWALES
INFILTRATION TRENCHES
INLET DEVICES
Most Appropriate Uses - 3_210_100056
RAIN BARRELS
Maintenance Issues - 3_210_100058
TREE BOX FILTERS
VEGETATED ROOFS
Maintenance Issues - 3_210_100061
Most Appropriate Uses - 3_210_100062
PERMEABLE PAVEMENT
Figure 8-14. Permeable Pavement Cross-Section
DEVELOPMENT AND EVALUATION OF ADDITIONAL PRACTICES
CHAPTER 9. LID SITE PLANNING PROCESS
Step 3: Develop LID control strategies
Step 3: Develop LID control strategies-continued
Step 4: Design LID Site or Master Plan
Step 5: Develop Operation and Maintenance Procedures-continued
CHAPTER 10. DESIGN EXAMPLES
RANK AND PRIORITIZE OPPORTUNITES
LID DESIGN
Figure 10-4. Office Complex Retrofit
NEW HOUSING DESIGN
Curve Number Calculations For Existing Site Condition
Post Development Curve Number Calculations
Figure 10-6. Proposed Housing
LID Site Planning Strategies
Figure 10-8. Map of Proposed Conditions (LID Design)
Storage Volume Comparison
Distributed Detention And Retention Storage Requirements
Selection of Appropriate IMPs-continued
Figure 10-9. Street Island Modifications
Figure 10-10. Street Alterations
Figure 10-11. Trash Rack
Figure 10-12. Tree Box Filter
Figure 10-13. Bioretention (Rain Garden)
Figure 10-14. Reforestation
WATER QUALITY CALCULATIONS
APPENDIX A. REFERENCES - 3_210_100091
APPENDIX A. REFERENCES-continued - 3_210_100092
APPENDIX A. REFERENCES-continued - 3_210_100093
APPENDIX A. REFERENCES-continued - 3_210_100094
APPENDIX A. REFERENCES-continued - 3_210_100095
APPENDIX A. REFERENCES-continued - 3_210_100096
APPENDIX B. GLOSSARY: ACRONYMS AND ABBREVIATIONS
APPENDIX C. SUPPORTING CALCULATIONS FOR SECTION 10-2
Exhibit A. TR-55 Time of Concentration Calculation for Existing Condition
Exhibit C. TR-55 Detention Basin Storage Volume Calculation for Proposed Condition, Conventional Site Design
Exhibit D. TR-55 Detention Basin Storage Volume Calculation for Proposed Condition, LID Site Design
APPENDIX D. LID DESIGN CHARTS
Chart 1. Storage Required to Maintain Pre-Development Peak Runoff Rate using 100% Retention
Chart 2. Storage Required to Maintain Pre-Development Peak Runoff Rate using 100% Detention
Chart 3. Storage Required to Maintain Pre-Development Runoff Volume
3_210_10
