The subdivider shall construct all necessary facilities, including, but not limited to, underground pipe, inlets, catch basins, detention/retention facilities or open drainage ditches, to provide for the adequate disposal of subsurface and surface water and maintenance of natural drainage courses. The permanent use of open drainage ditches is discouraged. Such ditches will be approved by the Engineer only in extreme situations or for temporary use. These utilities shall be designed and sized to serve nearby land and natural drainage areas. Soils and geologic strata in the Municipality are diverse. Sand and gravel, uncompacted peat, clay and well-drained shallow soil are all present. The subdivider is required to design drainage to handle the 100-year flood stage with a high degree of certainty. The specific downstream effect of storm run-off levels must be reviewed with the Engineer. The latest edition of the "Storm Water Design Manual of the City of Columbus" is hereby adopted and the policies, standards, specifications and provisions contained therein shall apply to the development of all subdivisions. Hydraulic calculations, tributary area maps and flood routing maps shall be submitted with the construction plans. Construction may not begin prior to the approval of such plans by the Engineer and the provision of a surety assuring approved installation and initial maintenance of the required improvements. The City Engineer shall determine the adequacy of the surety.
(Ord. 2014-27. Passed 8-5-14.)