PRIVATE STORM DRAINAGE NOTES

The Board of County Commissioners of Hamilton County, Ohio has adopted flood damage prevention regulations.
 
All proposed storm sewers and surface or other drainage facilities are to be private and maintained by the owner.

The Developer/Owner is to construct curbs, catch basins, downspouts, piping and connections etc. as required to convey the roof and paved surface drainage to the new detention/retention basin.

All internal drainage systems are to be designed for a ten year storm and given protection for a one hundred year storm. For storm drainage systems that out let into detention facilities a hydraulic gradient study may be required.

All ground surface areas that have been exposed or left bare as a result of construction and are to final grade and are to remain so shall be seeded and mulched as soon as practical in accordance with State of Ohio Specifications Item 659.

All new storm sewer, surface drainage construction, storm water detention facility construction and construction of temporary erosion control measures are to be under the inspection and supervision of the Public Works Department. Phone 513-946-4761 at least two days in advance of construction.

If storm water detention/retention facility construction is performed without calling for construction inspection and supervision by the Hamilton County Department of Public Works. The Public Works Department will invoice for the inspection/supervision time prior to acceptance based on the Hamilton County Department of Public Works estimate of time that would have been expended by the Public Works Inspector.

Certification of storage volume and an "As-Built" survey of the detention/retention facility by a Registered Professional Surveyor in the State of Ohio must be submitted for the proposed detention/retention facility prior to the recording of the Private Drainage Limits for Storm Water Detention Record Plat.

Private Storm Drainage Limits:

Private storm drainage limits shown on this plan are not accepted by the Board of County Commissioners of Hamilton County, Ohio and the County of Hamilton is not obligated to maintain or repair any channels or installations in said limits. The said limit area and all improvements in it shall be maintained continuously by the owner. No structures planting or other material shall be placed or permitted to remain which may obstruct, retard or change the direction of the flow of water through the drainage channel in the said limits.

The location of the private storm drainage limits must be prepared by the Developer's Engineer/Surveyor on a record plat by a metes and bounds description. The record plat is to be submitted to Hamilton County Public Works for review and approval prior to the submittal of the signed, sealed and notarized Mylar to be recorded. The Developer's Engineer/Surveyor is to submit a print of the recorded plat to the Hamilton County Department of Public Works for their files and records prior to approval of the Certificate of Occupancy.

STORM WATER DETENTION/RETENTION FACILITY TABLE

No gravity flow storm drains from any driveway, window well, stairwell, foundation, basement, patio or other source will be permitted to be directly connected to the proposed storm sewer system and/or existing or proposed watercourse below the high water elevations shown in the above table.

If the basement floor is below the above stated elevation, the basement shall be provided with a sump pump well and sump pump. The pump shall be discharged on the lot at or above the elevation stated above.

A gravity flow storm system may be discharged on the lot at a point where the outlet is not affected by flooding from the proposed storm sewer system and/or existing/proposed watercourse.