Section 250-RICR-150-10-8.24 - Green RoofsA. Feasibility 1. The system shall have a maximum slope of 20%, unless specific measures from the manufacturer are provided to retain the system on steeper slopes.2. Green roofs can meet water quality treatment goals only, and are not appropriate for Rev, CPv, or Qp.B. Conveyance 1. The runoff exceeding the capacity of the green roof system shall be safely conveyed to a drainage system or BMP without causing erosion. If an overland path is used, a stabilized channel shall be provided for erosive velocities (3.5 to 5.0 feet/second) for the 1-year storm event.2. The green roof system shall safely convey runoff from the 100-year storm away from the building and into a downstream drainage system.C. Treatment: Green roofs shall be designed to manage the WQv.D. Maintenance: A legally binding and enforceable maintenance agreement shall be executed between the facility owner and the responsible authority to ensure that the vegetation is maintained and that green roofs are inspected on a quarterly basis.250 R.I. Code R. 250-RICR-150-10-8.24
Amended effective 11/13/2018