Section 13b-17-13 - Drainage requirements(1) The following information is required on the plans for drainage review: (a) Original and proposed finished grades and contours, sufficient to determine the original slope of the land and the proposed slope at all points.(b) Size and location of all buildings, existing and to be erected, and their provision for roof drainage.(c) Location of all driveways, roads and/or areas to be paved, showing type of paving and provision for berms or curbs.(d) Grades along the traveled path and gutter of the State highway in front of and adjacent to the proposed work, sufficient to determine the slope of the highway at any point and the capacity of the gutter.(e) All existing and proposed drainage structures and/or outlets into, out of, and adjacent to the property to be developed (including existing State drainage facilities), showing types of structures, size and type of pipe, elevations of grates and inverts, accompanied with drainage computations as specified in the current edition of the Connecticut Department of Transportation Drainage Manual.(f) All existing and proposed drainage easements, to whom deeded, and the current owner of record.(2) No diversion of runoff from another watershed into State property will be allowed until proper drainage rights have been recorded.(3) The Bureau of Engineering and Highway Operations is not obligated to allow a connection of private storm drainage to its facilities. Where State facilities are adequate, the Bureau may allow a connection after it has been determined that sufficient drainage rights exist or have been obtained by the permittee.(4) In cases where the State drainage system is not adequate, the permittee may be required to replace the State facilities with a system of adequate capacity. Where no State drainage system exists, the permittee may be caused to install a separate outlet after obtaining necessary easements. A special agreement must be made with the Bureau of Engineering and Highway Operations covering the maintenance of such a separate outlet. The maintenance of the system may be undertaken by the municipality if the permit involves a street to be accepted by the municipality. A letter must be obtained from the appropriate municipal officials covering this maintenance, prior to the issuance of the permit.(5) Agreements consummated with a second party for the installation and maintenance of a private storm sewer within the State's right of way shall be recorded in the Municipal Land Records, and proof of recording must be submitted to the District Maintenance Manager prior to the effective date of the permit.(6) Minor connections from private properties to the State drainage system may be allowed if they discharge clean water only, do not overtax the State system, will not jeopardize the State drainage rights, and are made at drainage structures in a manner approved by the District Maintenance Manager. The permission to connect is of a temporary nature only and may be withdrawn at any time for any reason. A drainage connection concurrence form must be completed and filed in the Bureau of Engineering and Highway Operations records. In some instances, these agreements may require filing with the municipal clerk. In such cases, the responsibility and cost of filing shall rest with the permittee and shall be accomplished prior to the issuance of the permit, with proof of filing submitted to the District Maintenance Manager.(7) In order to protect the State highway system, permittees may be required to present plans for the control of silting and erosion during construction, particularly in cases where extensive excavations are to be made above the grade of the highway.(8) For drainage facilities crossing non-access lines, when it is advantageous to the State from the standpoint of hydraulic characteristics or aesthetics, a permit may be issued to install pipes within the highway right of way to extend an existing storm sewer outlet. It is also possible that in some cases it is of benefit to the State to allow a drainage outlet to be extended across a non-access highway. In these cases a sleeve must be jacked or bored under the highway with the drainage pipe encased in the sleeve. Access for installation and maintenance shall be for other than the limited or non-access highways. Applications for this type of permit shall conform to the current policy on inviolability of non-access lines.(9) The computations and plans shall consider all drainage areas contributing to the site, including roof areas, whether within the proposed development or outside of it.(10) All drainage of subdivisions and commercial sites shall be designed so that no flooding or damage to the State highway facilities will be caused by a storm having a 25-year frequency for surface runoff and a 50-year frequency for water courses.Conn. Agencies Regs. § 13b-17-13
Effective August 27, 1992