855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 138

Extracted Content

infiltration systems to store and gradually release stormwater. These features help to reduce runoff and promote natural groundwater recharge prior to consideration of offsite strategies.

DOCUMENTATION

Project types	Options	Paths	Documentation
All	All	All	Identification of zero lot line project.
All	All	All	LEED v5 Rainwater Management calculator.
All	Option 1. Percentile of Rainfall Event	All	Percentile of rainfall events retained.
All	Option 1. Percentile of Rainfall Event	All	Identify any end-uses that the project meets through collection and reuse of rainwater.
All	Option 1. Percentile of Rainfall Event	All	The documents depict and explain the site’s design conditions, including the overland flow paths of rainwater, the topography, and the soil conditions. They will also outline how the rainwater will be managed through infiltration, evapotranspiration, capture, reuse, and overflow outlets (e.g., topography plans, landscape plans, plant lists, construction details, cross sections, specifications, product information from manufacturers, and narratives).
All	Option 2. Natural Land Cover Conditions	All	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.
All	Option 2. Natural Land Cover Conditions	All	Evidence of the site’s natural land cover conditions that existed prior to any disturbance (e.g., historical maps, environmental impact assessments).
All	Option 2. Natural Land Cover Conditions	All	The documents depict and explain the site’s design conditions, including the overland flow paths of rainwater, the topography, and the soil conditions. The team will also outline how the increase in runoff will be managed by infiltration, evapotranspiration, capture and reuse (e.g., topography plans, landscape plans, plant lists, construction details, cross sections, specifications, product information from manufacturers, and narratives).

REFERENCED STANDARDS

• Technical Release 55 (T-55) Urban Hydrology for Small Watersheds (ars.usda.gov/research/software/download/?softwareid=8&modecode=80-42-05-10)

• Natural Resources Conservation Service (NRCS) (nrcs.usda.gov)

• U.S. EPA Rainwater Management Model (SWMM) (epa.gov/water-research/storm-water- management-model-swmm)

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 128