(a) Sanitary Sewer Improvements. The following requirements shall govern sewer improvements:
(1) Where an adequate public sanitary sewer system is reasonably accessible, in the determination of Council, public sanitary sewers shall be installed to adequately serve all lots, including lateral connections to the public system. Public sewer system extensions shall meet the requirements of the Construction Regulations, ordinances, resolutions and these Regulations. Combinations of sanitary sewers and storm sewers shall be prohibited.
(2) Where a public sanitary system is not reasonably accessible, the subdivider may provide:
A. A central treatment plant for the group, provided that such central treatment plant is installed in accordance with State and City requirements; or
B. Lots may be served by individual disposal systems if approved by the City, the County Health Department and the Ohio Environmental Protection Agency.
(3) Where the installation of individual disposal systems is considered, the suitability of the soil for individual systems, the absorptive ability of the soil, surface drainage, ground water level, and topography shall be the criteria for determining whether or not the installation of individual systems is permissible. Criteria shall be in accordance with the requirements of the Ohio Department of Health and the Ohio Environmental Protection Agency.
(b) Sanitary Sewer Map. The subdivider shall provide a map delineating the contributing area in acres to the sanitary sewer system and indicate the location of the design areas entering the system.
(c) Design Criteria. Sanitary sewers shall be designed in accordance with the requirements in subsection (e) hereof.
(1) The table in subsection (e) hereof is based on a population density of twelve persons per acre (single-family residential) density, with a per capita flow of 120 gallons per day (gpd).
(2) For area of greater population density than twelve persons per acre, the design flow shall be determined on a basis of population instead of area.
(3) For areas of greater population density than twelve persons per acre, a per capita flow of less than 120 gpd may be considered with the approval of the City.
(4) The sanitary sewer design shall be in accordance with the current edition of the "Ten States - Recommended Standards of Sewage Works" and the requirements of the Ohio Environmental Protection Agency (Ohio EPA).
(5) Each lot so served shall be of a size and shape to accommodate the necessary length of tile field at a safe distance from and at a lower elevation than the proposed building(s). Such lot size and shape shall conform to the requirements of the zoning district in which it is located.
(6) At least one percolation test shall be made for each lot area being platted, and each test shall be located in close proximity to the proposed individual sewage disposal unit, be numbered and its location shown on the preliminary plat. All percolation tests shall be performed in accordance with the requirements of the Director of Public Service, County Health Department and the Ohio Environmental Protection Agency.
(d) Design Data Sheet. Duplicate copies of the sanitary design data sheet shall be submitted to the City for approval along with one set of plans and the signature tracing. The subdivider shall provide the City with all required Ohio EPA submittals and pay all Ohio EPA review fees.
Minimum line size shall be eight-inch diameter; minimum depth, thirty-six inches.
Lift stations shall be permitted only where gravity sewers are clearly not practical.
(e) Design Basis. The design basis for sanitary sewers shall be:
(1) Twelve persons per acre; and
(2) One hundred-twenty gallons per person per day.
(3) The above figures are multiplied by a peak flow factor as shown in the following table.
(4) To the peak flow an infiltration allowance of 0.10 cubic feet per second per 100 acres is added. The resulting figures equal the design flow.
(5) 0.0001857 x population equals the average flow in cubic feet per second (cfs).
Acres | Population | 12 Persons @ 120 gpd(cfs) | Peak Flow Factor | W/O Infil. Peak Flow | Infil. 0.10 cfs/100 ac. | Design Flow |
20 | 240 | 0.0446 | 13 | 0.58 | 0.02 | 0.60 |
50 | 600 | 0.1114 | 9.7 | 1.09 | 0.05 | 1.14 |
100 | 1,200 | 0.2228 | 7.9 | 1.76 | 0.10 | 1.86 |
120 | 1,440 | 0.2674 | 7.5 | 2.00 | 0.12 | 2.12 |
200 | 2,400 | 0.4456 | 6.4 | 2.84 | 0.20 | 3.04 |
300 | 3,600 | 0.6684 | 5.6 | 3.75 | 0.30 | 4.05 |
400 | 4,800 | 0.8913 | 5.1 | 4.56 | 0.40 | 4.96 |
500 | 6,000 | 1.1141 | 4.8 | 5.31 | 0.50 | 5.81 |
600 | 7,200 | 1.3369 | 4.5 | 6.01 | 0.60 | 6.61 |
700 | 8,400 | 1.5597 | 4.3 | 6.67 | 0.70 | 7.37 |
800 | 9,600 | 1.7825 | 4.1 | 7.30 | 0.80 | 8.10 |
900 | 10,800 | 2.0053 | 3.9 | 7.91 | 0.90 | 8.81 |
1,000 | 12,000 | 2.2282 | 3.8 | 8.49 | 1.00 | 9.49 |
1,200 | 14,400 | 2.6738 | 3.6 | 9.60 | 1.20 | 10.80 |
1,400 | 16,800 | 3.1194 | 3.4 | 10.63 | 1.40 | 12.03 |
1,600 | 19,200 | 3.5651 | 3.3 | 11.62 | 1.60 | 13.22 |
1,800 | 21,600 | 4.0107 | 3.1 | 12.57 | 1.80 | 14.37 |
2,000 | 24,000 | 4.4563 | 3.0 | 13.48 | 2.00 | 15.48 |
3,000 | 36,000 | 6.6845 | 2.6 | 17.63 | 3.00 | 20.63 |
4,000 | 48,000 | 8.9126 | 2.4 | 21.27 | 4.00 | 25.27 |
5,000 | 60,000 | 11.1408 | 2.2 | 24.60 | 5.00 | 29.60 |
(Ord. 85-11. Passed 4-1-85.)