These procedures will help in the preparation of a Stormwater Management/Sediment Control Plan (SWM/SCP) that will meet the requirements of this chapter and State NPDES Stormwater Permits. These guidelines are not intended to be all-inclusive or to address all possible situations.
(a) Configure the site layout to maintain as much of the existing natural drainage system as possible.
(1) Where increased conveyance and improved drainage is needed, do not create new ditches or enclose waterways in pipe, but instead apply stream channel restoration or construction practices to increase capacity.
(2) Improve existing ditches or other extensively degraded channels by re-establishing riparian buffers and in-stream restoration practices.
(b) Scrutinize every possible way to minimize the amount of impervious surface to be created.
(1) Cluster developments to the extent possible.
(2) Minimize street widths and lengths, minimize off-street parking to the extent required by Zoning or Subdivision Regulations, and use modular paving bricks, or other similar pervious surfaces rather than concrete or asphalt for non-traffic areas.
(c) Design the on-site drainage system to be stable for the design storm. This should include roadside ditches, storm sewers, retention/detention basins, outlet pipes, etc. (See Section 929.04(h) for design storm criteria.)
(d) Manage concentrated stormwater flows to minimize soil erosion/sedimentation.
(1) Minimize the amount of the worksite that will be disturbed, staging construction if at all possible to limit the area of clearing, grading and excavation.
(2) Preserve trees, buffer strips of natural vegetation along streams, and provide temporary seeding on disturbed areas as quickly as possible.
(e) Design sediment control structures that should be put in place in the first stages of development for control of erosion and sedimentation during and after construction. Sediment ponds should be the first priority structure for drainage areas of five (5) acres or more of disturbed areas. Silt fences and/or straw bales may be used to control sheet flow run-off. Measures shall be taken to eliminate sedimentation of storm sewers, catch basins, manholes and similar structures. These should be protected by the use of filter insert devices, stone dikes or other acceptable techniques. Developers shall refer to the publication "Rainwater and Land Development", published by the Ohio Dept. of Natural Resources Div. of Soil and Water Conservation, Fountain Square Court, Columbus, Ohio.
(Ord. 2787. Passed 11-26-07.)