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LEED v4
Existing Retail
Sustainable Sites
Rainwater management

LEED CREDIT

Retail-EBOM-v4 SSc2: Rainwater management 3 points

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LEEDuser expert

Ashwini Arun

WSP
Sustainability Manager

SPECIAL REPORT

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Credit language

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© Copyright U.S. Green Building Council, Inc. All rights reserved.

Intent

To reduce runoff volume and improve water quality by replicating the natural hydrology and water balance of the site, based on historical conditions and undeveloped ecosystems in the region.

Requirements

Establishment

Use low-impact development (LID) practices to capture and treat water from 25% of the impervious surfaces for the 95th percentile storm event.

Establish and implement an annual inspection program of all rainwater management facilities to confirm continued performance.

Performance

Document the annual inspections, including identification of areas of erosion, maintenance needs, and repairs. Perform necessary maintenance, repairs, or stabilization within 60 days of inspection.

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Frequently asked questions

Where can I find long-term rainfall data?

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What if I have less than 10 years of historical rainfall data?

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What methodology should I use to calculate runoff volume?

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Are there any specific tools or computer programs that are recommended for calculating runoff volume?

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What are some low-impact development (LID) and green infrastructure (GI) strategies?

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Where can I find example calculations?

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What about rainwater runoff from greenfield areas in my LEED project boundary?

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LEEDuser expert

Ashwini Arun

WSP
Sustainability Manager

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USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Intent

To reduce runoff volume and improve water quality by replicating the natural hydrology and water balance of the site, based on historical conditions and undeveloped ecosystems in the region.

Requirements

Establishment

Use low-impact development (LID) practices to capture and treat water from 25% of the impervious surfaces for the 95th percentile storm event.

Establish and implement an annual inspection program of all rainwater management facilities to confirm continued performance.

Performance

Document the annual inspections, including identification of areas of erosion, maintenance needs, and repairs. Perform necessary maintenance, repairs, or stabilization within 60 days of inspection.

In the end, LEED is all about documentation. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with:

  • Calculators to help assess credit compliance.
  • Tracking spreadsheets for materials purchases.
  • Spreadsheets and forms to give to subs and other team members.
  • Guidance documents on arcane LEED issues.
  • Sample templates to help guide your narratives and LEED Online submissions.
  • Examples of actual submissions from certified LEED projects.

Where can I find long-term rainfall data?

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 if I have less than 10 years of historical rainfall data?

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 methodology should I use to calculate runoff volume?

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.)

Are there any specific tools or computer programs that are recommended for calculating runoff volume?

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 are some low-impact development (LID) and green infrastructure (GI) strategies?

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 can I find example calculations?

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 about rainwater runoff from greenfield areas in my LEED project boundary?

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.)

LEEDuser expert

Ashwini Arun

WSP
Sustainability Manager

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