Section 290-RICR-20-00-4.15 - StormwaterA. It shall be unlawful for any person, firm or corporation to make any connection into a State road drainage system, or to drain or pump water onto the traveled surface of a State Highway without first obtaining written permission from the Director of the Department.B. When the Permittee intends to grade their property towards the State highway, the Permittee shall make provision, at their own expense, for disposition of highway and/or site drainage by installing pipe, inlets, catch basins, manholes, headwalls and ditches of proper size and material as may be necessary, in the Department's determination, to protect the State's drainage rights.C. Any Permittee making a direct connection to the State Highway drainage system shall clean, inspect and repair as necessary, that part of the State Highway drainage system (all assets) as part of the Permit work. These direct connection applications shall treat 50% of the water quality volume, at a minimum.D. Where the construction of a driveway necessitates crossing a State Highway drainage ditch, a culvert pipe shall be installed in the ditch by the Permittee at their own expense. The culvert shall be no less than twelve inches in diameter, and of sufficient size to carry the stormwater runoff from a twenty-five (25) year storm, as determined by the National Oceanic and Atmospheric Administration, for the watershed area. Under no circumstances shall existing ditches, swales or gutters be filled without adequate alternate provisions for drainage being made and approved through application for and issuance of a Permit.E. The Applicant, in the case of commercial applications, is required to submit detailed computations and site-grading plans for drainage conditions existing and proposed when applying for a Permit. These computations should be made considering a storm of twenty-five (25) - year frequency with a duration equal to the time of concentration. These computations and plans shall be approved and stamped by a Rhode Island Registered Professional Engineer. If storm drainage will not affect the State Highway drainage system, a statement of no impact should be submitted with a Application approved and stamped by a Rhode Island Registered Professional Engineer, or a Rhode Island Registered Land Surveyor when the property in question is graded away from the State Highway drainage system.F. Drainage Appurtenances - All facilities, pipes, drains, catch basins, manholes and other appurtenances will be as indicated in "Rhode Island Department of Transportation, Standard Details."G. The applicant shall be responsible to show no increase to peak flow and total volume of run off from existing conditions entering the State Highway drainage system in a twenty-five (25) year storm, unless in the case of total volume the applicant can demonstrate unconditionally that there will be no impact to the receiving [water] body(ies). In addition, if a connection to the State Drainage System is proposed, the applicant shall address water quality impacts through incorporation of Structural Stormwater Treatment Practices and through the use of Best Management Practices (BMPs). Design and construction of all stormwater mitigation shall be in accordance with the Rhode Island Department of Environmental Management's "Stormwater Design and Installation Standards Manual"H. No activities that result in the exposure of soils shall occur prior to the installation of all proper Soil Erosion and Sediment Control (SESC) plans and procedures.I. Consideration and care shall be made during the site planning and development process to locate dumpsters and other potential sources of pollutants so that any effluent from these assets is not directed into the State Highway drainage system.290 R.I. Code R. 290-RICR-20-00-4.15
Amended effective 11/28/2018