NC-v5 SSc3: Rainwater Management 3 points
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Credit language
© 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, to avoid contributing to flooding downstream in frontline communities.
Requirements
Option 1. Percentile of Rainfall Events (1–3 points)
In a manner best replicating natural site hydrology processes, retain the runoff from the associated percentile of regional or local rainfall events onsite. The percentile event volume must be retained (e.g., infiltrated, evapotranspired, or collected and reused) using LID and GI practices. GI and LID strategies can be either structural or nonstructural.
For projects that collect and reuse a portion of the chosen percentile event volume to meet the needs of one or more end uses for the building and grounds, 1 additional point can be earned. Eligible end uses include irrigation, flush fixtures, makeup water systems (e.g., cooling towers or boilers), and other process water demands. Collecting and reusing rainwater within the project can also contribute to points earned in the Water Efficiency credit category. Points are awarded according to Table 1.
Table 1. Points for Percentile of Regional or Local Rainfall Events Retained
All Projects | Zero Lot Line Projects | Points | Total Points for Water Reuse |
80th percentile | 70th percentile | 1 | 2 |
85th percentile | 75th percentile | 2 | 3 |
90th percentile | 80th percentile | 3 | – |
OR
Option 2. Natural Land Cover Conditions (3 points)
Calculate the difference between the projected runoff volume under the proposed design conditions and the runoff volume under natural land cover conditions that existed prior to any disturbance. Retain (e.g., infiltrate, evapotranspire, or collect and reuse) onsite the increase in runoff volume using LID and GI practices.
For zero lot line projects only
Project teams may combine on-site and off-site strategies to retain runoff from the associated percentile regional or local rainfall event for points according to Table 1. Engage with local or regional authorities to coordinate off-site rainwater management strategies that meet the credit’s intent, such as participating in community-wide rainwater management programs.
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Credit language
© 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, to avoid contributing to flooding downstream in frontline communities.
Requirements
Option 1. Percentile of Rainfall Events (1–3 points)
In a manner best replicating natural site hydrology processes, retain the runoff from the associated percentile of regional or local rainfall events onsite. The percentile event volume must be retained (e.g., infiltrated, evapotranspired, or collected and reused) using LID and GI practices. GI and LID strategies can be either structural or nonstructural.
For projects that collect and reuse a portion of the chosen percentile event volume to meet the needs of one or more end uses for the building and grounds, 1 additional point can be earned. Eligible end uses include irrigation, flush fixtures, makeup water systems (e.g., cooling towers or boilers), and other process water demands. Collecting and reusing rainwater within the project can also contribute to points earned in the Water Efficiency credit category. Points are awarded according to Table 1.
Table 1. Points for Percentile of Regional or Local Rainfall Events Retained
All Projects | Zero Lot Line Projects | Points | Total Points for Water Reuse |
80th percentile | 70th percentile | 1 | 2 |
85th percentile | 75th percentile | 2 | 3 |
90th percentile | 80th percentile | 3 | – |
OR
Option 2. Natural Land Cover Conditions (3 points)
Calculate the difference between the projected runoff volume under the proposed design conditions and the runoff volume under natural land cover conditions that existed prior to any disturbance. Retain (e.g., infiltrate, evapotranspire, or collect and reuse) onsite the increase in runoff volume using LID and GI practices.
For zero lot line projects only
Project teams may combine on-site and off-site strategies to retain runoff from the associated percentile regional or local rainfall event for points according to Table 1. Engage with local or regional authorities to coordinate off-site rainwater management strategies that meet the credit’s intent, such as participating in community-wide rainwater management programs.