(a) The road storm sewer system shall serve as the prime drainage system. It shall be designed to carry roadway, adjacent land and house storm water drainage. The design discharge used to determine pavement inlet spacing shall be based on the Rational Method as mentioned above. The gutter flow between inlets shall be analyzed by the equation: Q-.56 Z/NS ½ Y8/3.
(b) The inlet spacing shall be based on a ten-year frequency, fifteen-minute duration design storm. The spread of water on the pavement shall be limited to two feet into the traveled lane. In addition to the above, storm sewers shall contain inlets, catch basins or manholes at intervals of not over 300 feet.
(c) When the drainage system is outside of the road right of way, the developer shall petition the Planning Commission to set up a Village-established ditch to provide for the future maintenance of the system by assessment of the benefitted owners within the subdivision. This system shall be so designed to incorporate only the watershed affecting the allotment and to an adequate outlet.
(d) All waterways with a design capacity not exceeding the capacity of a thirty-six inch concrete pipe shall be enclosed. Existing creeks or ditches constructed by the developer which exceed the above limit, shall be constructed with a minimum of ten-foot wide continuous earth roadway which is to provide access for maintenance equipment to all sections of the ditch. The ditch easement shall be wide enough to contain such ditch slopes and roadway with ample clearance for the operation of maintenance equipment. Open ditches shall have 2:1 side slopes and a minimum two-foot bottom width.
(e) Any storm drainage courses carried along side lot lines shall be enclosed with approved pipe.
(f) The following pipe policy will be worked together with the S.H.D. specifications:
(1) It is intended that all pipe lines including culverts, storm sewers, etc., located beneath the main roadways (within shoulder limits), shall meet the requirements set forth for Class A pipe.
(2) Longitudinal storm sewer lines, not under the main roadways, shall be identified as Class D or Class E. Where these sewers require stronger pipe by reason of shallow cover or location beneath side roads or drives, Class B or Class C pipe shall be specified.
(3) Longitudinal roadway drainage lines, for which sealed joints are unnecessary or undesirable, shall be identified as Class H pipes. Portions of these drains that require stronger pipe by reason of shallow cover, or location beneath side roads or drives, shall be specified as Class C pipe.
(4) Open-end driveway pipe, twenty-four inches or less in diameter, may be Class F pipe and those over twenty-four inches will be Class B or Class C pipe.
(5) Outlet pipe for open-joint drains (Class H or I) shall be in accordance with the provisions of Class F pipe and will usually be ten feet in length.
(6) For pipe underdrains, the designer shall specify Class I pipe.
(7) Pipe arches or elliptical pipes will be designated as Class G.
(g) The pipe policy set forth in subsection (f) hereof and the pipe policy used by the
Ohio State Highway Department shall be used in designing storm sewer systems.
(Ord. 1500. Passed 12-14-99.)