Ashwini Arun
WSP
Senior Sustainability Manager
EBOM-2009 SSc6: Stormwater quantity control 1 point
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To limit disruption of natural hydrology by reducing impervious cover, increasing on-site infiltration, reducing or eliminating pollution from stormwater runoff and eliminating contaminants.Requirements
Option 1
During the performance period, implement a stormwater management plan that infiltrates, collects and reuses runoff or evapotranspirates runoff from at least 15% of the precipitation falling on the whole project site both for an average weather year and for the 2-year, 24-hour design storm. Implement an annual inspection program of all stormwater management facilities to confirm continued performance. Maintain documentation of inspection, including identification of areas of erosion, maintenance needs and repairs. Perform all routine required maintenance, necessary repairs or stabilization within 60 days of inspection.OR
Option 2
Use Low Impact Development (LID)1 practices to capture and treat water from 25% of the impervious surfaces for the 95th percentile of regional or local rainfall events. Implement an annual inspection program of all stormwater management facilities to confirm continued performance. Maintain documentation of inspection, including identification of areas of erosion, maintenance needs and repairs. Perform all routine required maintenance, necessary repairs or stabilization within 60 days of inspection.
1Low impact development (LID) is an approach to managing stormwater runoff that emphasizes on-site natural features to protect water quality by replicating the natural land cover hydrologic regime of watersheds and addressing runoff close to its source. Examples include better site design principles such as minimizing land disturbance, preserving vegetation, minimizing impervious cover, and design practices like rain gardens, vegetated swales and buffers, permeable pavement, rainwater harvesting, and soil amendments. These are engineered practices that may require specialized design assistance.
Alternative Compliance Paths (ACPs)
[view:embed_resource=page_1=4649824][view:embed_resource=page_1=4649824] See all forum discussions about this credit »Frequently asked questions
What is the runoff coefficient for water bodies like pools and ponds onsite?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
Where do I find information about the 2-year 24-hour storm for my location?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
What is the best way to determine the slope of vegetated areas?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
What value should we use for the runoff coefficient for our pervious paving?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
We have an international project and don’t know where to find data for the 2-year 24-hour storm. Where can we find this information?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
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Cost estimates for this credit
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LEEDuser overview
Frank advice from LEED experts
LEED is changing all the time, and every project is unique. Even seasoned professionals can miss a critical detail and lose a credit or even a prerequisite at the last minute. Our expert advice guides our LEEDuser Premium members and saves you valuable time.
For full access, sign up now for LEEDuser Premium
Already a premium member? Log in now
Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To limit disruption of natural hydrology by reducing impervious cover, increasing on-site infiltration, reducing or eliminating pollution from stormwater runoff and eliminating contaminants.Requirements
Option 1
During the performance period, implement a stormwater management plan that infiltrates, collects and reuses runoff or evapotranspirates runoff from at least 15% of the precipitation falling on the whole project site both for an average weather year and for the 2-year, 24-hour design storm. Implement an annual inspection program of all stormwater management facilities to confirm continued performance. Maintain documentation of inspection, including identification of areas of erosion, maintenance needs and repairs. Perform all routine required maintenance, necessary repairs or stabilization within 60 days of inspection.OR
Option 2
Use Low Impact Development (LID)1 practices to capture and treat water from 25% of the impervious surfaces for the 95th percentile of regional or local rainfall events. Implement an annual inspection program of all stormwater management facilities to confirm continued performance. Maintain documentation of inspection, including identification of areas of erosion, maintenance needs and repairs. Perform all routine required maintenance, necessary repairs or stabilization within 60 days of inspection.
1Low impact development (LID) is an approach to managing stormwater runoff that emphasizes on-site natural features to protect water quality by replicating the natural land cover hydrologic regime of watersheds and addressing runoff close to its source. Examples include better site design principles such as minimizing land disturbance, preserving vegetation, minimizing impervious cover, and design practices like rain gardens, vegetated swales and buffers, permeable pavement, rainwater harvesting, and soil amendments. These are engineered practices that may require specialized design assistance.
Alternative Compliance Paths (ACPs)
[view:embed_resource=page_1=4649824][view:embed_resource=page_1=4649824] See all forum discussions about this credit »Checklists
Step by step to LEED certification
LEEDuser’s checklists walk you through the key action steps you need to earn a credit, including how to avoid common pitfalls and save money.
For full access, sign up now for LEEDuser Premium
Already a premium member? Log in now
Documentation toolkit
The motherlode of cheat sheets
LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.
For full access, sign up now for LEEDuser Premium
Already a premium member? Log in now
Frequently asked questions
What is the runoff coefficient for water bodies like pools and ponds onsite?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
Where do I find information about the 2-year 24-hour storm for my location?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
What is the best way to determine the slope of vegetated areas?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
What value should we use for the runoff coefficient for our pervious paving?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
We have an international project and don’t know where to find data for the 2-year 24-hour storm. Where can we find this information?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
Guest expert
Ashwini Arun
WSP
Senior Sustainability Manager