250 R.I. Code R. 250-RICR-150-10-8.27

Current through November 21, 2024

Section 250-RICR-150-10-8.27 - Pretreatment - Grass Channel

A. Grass channels are similar to conventional drainage ditches, with the major differences being flatter side and longitudinal slopes, as well as a slower design velocity for small storm events.

B. Sizing of the grass channel length is based on flow rate from the water quality storm (WQf) and should be designed to ensure an average residence time of 10 minutes to flow from the inlet to the outlet of the channel (for linear projects with no defined primary inflow location, residence time shall be measured from the mid-point location of the channel).

C. The following maintenance activities shall be performed on an annual basis or more frequently as needed:

1. Sediment removal;

2. Mowing and litter and debris removal; and

3. Stabilization of eroded side slopes and bottom.

250 R.I. Code R. 250-RICR-150-10-8.27

Amended effective 11/13/2018