(a) Grading.
(1) The site plan submitted for the building shall show, in addition to all proposed improvements, all revisions being made to the site which are not in accord with the approved and executed grading plan for the subdivision. This shall include field verified grade elevations of existing conditions.
(2) When a lot is graded to higher or lower level than the existing grade, the owner shall provide slopes (max. 3: 1), retaining wall, or other approved protection, on his property, to preserve the elevation of the adjoining property. Steeper slopes may be approved in special limited cases.
(3) Finished grade immediately adjacent to the building shall be graded downward away from the building at a minimum slope of five percent (5%) (five-eighths inch in twelve inches) for a distance not to exceed one-half of the side yard (ten feet maximum).
(4) All parts of the grading and drainage systems shall satisfy the requirements of the City Engineer and the Building Department.
A. Grading shall be done so that the drainage pattern (in place or approved) is not changed, and storm water ground run-off to adjoining property is not increased, re-directed, concentrated or caused to spill off the property in new locations, so as to create storm water problems on adjacent property.
B. Storm water shall be directed into the same watershed and in the same general direction that existed prior to the site grading operation. Diversion into other watersheds is not permitted, except when approved for very minor grading areas occurring totally within the newly developed lot, and then only when no problems will be created on adjacent property.
(5) All applicable requirements of the grading and drainage regulations of the various agencies shall be complied with before a Certificate of Occupancy shall be issued.
A. Work which is executed but is not in conformance with the regulations and/or the approved site plan, shall be removed and remedial action taken to bring the property into full compliance.
(b) Drainage. The storm drainage system on each lot shall comply with the above and shall include, but is not limited to the following:
(1) An approved surface and/or sub-surface drainage system for the collection and disposal of storm runoff and sub-surface water from the site to prevent flooding, erosion and standing water. Concentrate storm drainage flow shall be directed to approved surface and/or sub-surface drainage facilities as required herein.
(2) The drainage system shall carry and discharge storm water without producing any adverse effect on adjacent or immediate downstream properties. Retention facilities shall be provided, as required by the City Engineer to facilitate the containment and slow release of storm run-off.
(3) The choice of outflow facilities lies with the property owner, but shall be approved by the City, which reserves the right to require use of another facility. Such facilities shall include, but are not limited to:
A. Existing surface and piped facilities, such as swales, watercourses, drainage easements, storm sewers, etc. as regulated by the City Engineer.
1. Use of storm sewers shall be approved, in concept, by the Department of Public Works, and no such sewer shall be considered available unless it is low enough to allow the slope of the lateral entering it to meet the requirements of the storm drainage system regulations.
2. The storm or combined sewer shall be considered available only if the braking or cutting of the flat paving in the public right-of-way, or if the tunneling under the street to access the sewer is fully approved by the agency regulating the roadway.
B. Street drainage ditches and street gutters, via an outflow pipe (through the curb, where applicable) as regulated within the public right-of-way by the City Engineer.
(4) Surface drainage. Positive surface drainage shall be provided for each lot so there is no pocketing of water on any surface. This can be accomplished by grading or installing catch basins, area drains, underdrains, etc. properly connected to approved disposal facilities.
A. Grading shall be done so that the existing natural ground drainage of the areas is not impeded, distorted or redirected.
(5) Yard drainage. Where no storm or combined sewer is available, no garage apron, driveway, stairwell, window (area) well, foundation drain, walkway, below-grade entrance area, or any below-grade area subject to receiving storm drainage shall be permitted unless it has a gravity drainage system or an approved sump well and pump installation.
A. Outflow shall comply with subsection (b)(3) hereof, except that no clear water sump discharge shall be permitted into a street gutter.
(6) Building drainage. All building surfaces which collect and drain storm water shall have slopes, drains, gutters and downspouts, or other such facilities, installed in full accord with the Ohio Plumbing Code, and Chapter 20 of the Hamilton County Building Code. All parts and devices of such collection system shall be connected to the drainage system as prescribed in the Plumbing Code and the storm water therein shall be carried to proper outflow facilities, as required by subsection (b)(3) hereof.
A. Gutters and downspouts, for one and two family dwellings, shall be provided in sheet metal material, at the rate of one downspout and necessary guttering for each 400 square feet, or fraction thereof, of horizontal building area under each roof surface.
Downspouts shall be connected to the drainage system, as regulated by the Plumbing Code, as the first joint above the grade.
B. All other buildings shall be regulated by the OBBC.
(7) All projects shall be planned, designed and executed to utilize proper drainage equipment, techniques and facilities. Plans submitted for review must accurately show all existing and proposed storm drainage system features, including downspouts, leader lines, grading, elevations (grades), swales, easements, outflow, etc. Additional information may be required as necessary for complete review.
A. Drainage piping subjected to traffic loads under private roads, driveways, etc. shall be heavy-gauge corrugated metal, concrete, reinforced concrete, ADS plastic, PVC Schedule 40 or metal, as per State of Ohio DOT specifications. Earth cover over such piping shall be a minimum of one inch to six inches thick.
(8) Work executed at variance with stated rules and regulations or the approved drawings shall be removed and/or re-worked to meet the requirements applicable.
(9) When operation of drainage system or pattern is in doubt, drainage to any means of disposal shall be dye-tested to insure proper function.
Such testing shall be accomplished by the general (prime) contractor or owner, in the presence of the appropriate inspector(s), and compliance with the applicable regulations shall be achieved prior to the issuance of the Certificate of Occupancy.
(c) Application for a permit of any new building shall be accompanied by the required number of site surveys of the property, prepared by a registered surveyor. This shall show, in addition to the lot location, bounds and building location on the lot etc., the following information:
(1) Type of sewer (such as storm, sanitary, combined), material and size of the sewer, sea level elevations of sewer inverts at location of laterals, inlets, outlets, catch basins, manholes (when sewer is to be utilized); the proposed floor level of the lowest floor (including basement or cellar) of building;
(2) Accurate, field-verified, sea level elevations of existing grades; proposed final grades of yard to determine compliance with this section;
(3) Drainage pattern and/or facilities that are available for use or which are to be constructed (See subsection (b)(7) hereof);
(4) Where project is to be placed between two closely adjacent buildings, or on a large isolated lot, or where no subdivision grading plan is available, an expanded site survey is required. This survey shall accurately show all existing buildings, elevations, drainage facilities, and drainage patterns on the site and on adjacent property within fifty feet (minimum) of the new building, or at an additional distance as necessary for complete review. This plan shall show all existing and proposed elevations and elements of the drainage system which shall be reviewed for approval in light of the surrounding properties and their drainage facilities, patterns, and requirements.
(Ord. 26-1989. Passed 12-18-89.)