(a) Purposes. The purposes of this section are to protect existing properties by controlling the water runoff from development areas, to protect the environmental integrity of the existing wetlands, to preserve the water quality of Hudson's wellhead protection areas, to implement water quality studies for the Mud Brook - Powers Brook, Brandywine Creek, and Tinkers Creek watersheds, and to provide minimum design standards for stormwater management facilities.
(b) Applicability. Stormwater retention/detention applies to all development in the City of Hudson except "minor development" as defined in Section 1203.09(d), Site Plan Review.
(b) Applicability. Stormwater retention/detention applies to all development in the City of Hudson except "minor development" as defined in Section 1203.09
(d), Site Plan Review.
(c) General Criteria. The City of Hudson Engineering Standards for Infrastructure Construction are the accepted design and construction specifications for stormwater management facilities in the City. All provisions in the Engineering Standards shall be applicable to all development in the City of Hudson, Ohio.
(d) Additional Regulations.
(1) In addition to the requirements of the Engineering Standards for Infrastructure Construction, the following additional regulations shall be adhered to:
A. Retention/detention basins. Developers constructing detention basins are encouraged to design them for use as neighborhood open space and recreation components and to consider designs based on Summit County Soil and Water Conservation District recommendations or guidelines from the Center for Watershed Protection. Adequate signage declaring the intended use of the basin shall be conspicuously displayed along with appropriate warnings about storms. All such signs shall be approved by the City.
B. To the maximum extent feasible, the applicant's stormwater management plan shall include the following non-structural control techniques. Where the applicant proposes the use of detention/retention facilities, he must first utilize one or more of the following runoff reduction measures. The applicant shall provide a written justification of the utilization of the following in calculating storage capacities of the detention/retention facilities:
1. Areas undisturbed (cleared) by construction;
2. Restriction of development on steep slopes;
3. Maintenance of vegetation buffers;
4. Minimization of impervious surfaces and use of pervious surfaces;
C. Use of terraces, contoured landscapes, tiered pond systems, runoff spreaders, grass or rock-lined waterways; and/or
D. Use of infiltration trenches.
E. Other techniques appropriate to the site as recommended by the City Community Development and/or City of Hudson Engineering Department Staff.
(2) Wetlands may be considered for use in reducing stormwater runoff using the following criteria:
A. No existing or proposed structure shall be affected due to flooding during the post-development 25-, 50-, or 100-year storm.
B. No adverse impact will occur on existing vegetation within the wetland.
C. The use of a modified level spreader as defined in the City of Hudson Design Specifications is required at all stormwater outlets to the wetland.
D. The City may request further study parameters of the wetland if additional concerns are raised.
E. Exception: Wetlands located in the City of Hudson's mapped wellhead protection areas shall not be used for the purposes of reducing stormwater runoff.
F. The written approval of the Army Corps of Engineers and/or the Ohio Environmental Protection Agency is required.
(3) Channels, swales, and ditches. Channels, swales, and ditches are not permitted as part of the primary stormwater management system in any new development, except as provided below. Due to topography or other reasons approved by the City Engineer, swales or ditches between buildings are permitted to carry stormwater to an underground system.
A. Stormwater from no more than one acre of residential development or a one-half-acre area in commercial, industrial, or retail districts shall be transported on the surface before being intercepted by an underground drainage system.
(4) Erosion and sediment control. Stormwater pollution prevention plans are required for the purpose of controlling the pollution of public waters by sediment from accelerated soil erosion and accelerated stormwater runoff caused by earth disturbing activities and land use changes connected with developing urban areas.
(5) Plat notes. A note shall be added to all final plats indicating that the detention/retention facilities shall be owned and maintained by the property owner or homeowners/condominium association as appropriate. The note should also indicate that the City of Hudson reserves the right to assess the responsible entity for any necessary maintenance and/or improvements that must be performed by the City.
(Ord. 18-93. Passed 10-15-19.)