§ 1105-03. Drainage Required.
The provisions of Section 1101.2 OPC are superseded by the following:
(a)
Every building, except accessory buildings less than 800 square feet in area, must be equipped with gutters and downspouts connected to an approved sewer. Drains from roofs, sun decks, or promenades open to occupancy must be trapped when connected to a combined sewer. If there is no approved sewer, the downspout must be connected under the sidewalk to the street gutter, or the stormwater must be disposed of in an approved manner on the property. Where stormwater pipes discharge into a paved street gutter, there must be at least one length of cast-iron pipe at the gutter connection. The cast iron section must extend from the gutter to the back of the sidewalk or ten feet away from the gutter, whichever is greater. Subsurface water (e.g. foundation drains, sump lines, etc.) shall not discharge to a paved street gutter.
Exceptions: Where approved, stormwater from roofs and similar impervious surfaces is permitted to discharge to grade as follows:
(1)
Stormwater may discharge to grade without gutters and downspouts for roof areas of less than 50 square feet over bay windows, entry stoops and similar projections;
(2)
Stormwater may discharge to grade without gutters and downspouts for roof areas of less than 400 square feet where the points of discharge to a pervious ground surface is at least 10 feet from property lines and the flow of surface water is away from adjacent buildings;
(3)
In instances where the property is not in a hillside overlay district and the Director of Sewers deems it advantageous to relieve the public sewer system by disconnecting downspouts or not connecting downspouts to the public sewer system, the following items will be considered in this determination:
i.
The ground where the downspout will discharge will allow water to flow away from structures, driveways, sidewalks, alleys, roadways, and neighboring properties.
ii.
The ground or containment area where the downspout will discharge is capable of accepting stormwater flow from a 10 year, 24 hour storm event with acceptable emergency overflow devices and standing water will be eliminated within 48 hours from the start of accumulation.
iii.
The ground where the downspout will discharge is characterized by one of the following soil classifications as shown in the Soil Survey of Hamilton County, Ohio: Gn, Go, Hu, Ju, McA, McB, PbB2, PbC2, PbD, PbE, PcB, PcC, RwB2, RxB, UgB, UgC, Uh, UmB, UmC.
iv.
Disconnected downspouts shall be SDR 35 or an approved equal and shall extend below grade at least six feet away from a basement, foundation, crawl space, or concrete slab. Approved splash blocks or permanent erosion control is required and cannot be part of the measurement. The outlet of the extension will be at least ten feet away from any property lines and retaining walls. Where downspout lines discharge into a paved street gutter there shall be at least one length (ten feet) of cast-iron pipe at the gutter connection. The cast iron section must extend from the gutter to the back of the sidewalk or ten feet away from the gutter, whichever is greater.
v.
Downspout extensions will not discharge above oil tanks or septic systems.
vi.
Any abandoned downspout stacks is sealed with a one inch thick concrete cap or an approved equal.
(b)
All paved areas more than 800 square feet in area that do not have natural drainage on the same property shall be drained into an approved sewer. If there is no approved sewer the stormwater shall be disposed of in an approved manner on the property.
(c)
When connected to a combined sewer, one trap may serve all connections described in this section. Traps shall be below the frost line or on the inside of the building.
(d)
No pipe or pipes conveying rain or surface water shall be connected to a sanitary sewer and any such existing connections encountered or reported shall be disconnected by the owner of the premises and the rain and surface water disposed of in an approved manner. All such connections to sanitary sewers shall be disconnected when any plumbing alterations are made.
(e)
Area drains and subsurface drains that discharge to the ground surface shall meet the same requirements outlined in section[s] (a)(3)i, ii, iii, iv, v.
(f)
Rainwater collection, catchment and harvesting devices, such as rain barrels, may be installed outside of a building if both of the following conditions are satisfied:
(1)
Any such devices are equipped with an overflow that meets the requirements of this Chapter 1105; and
(2)
All collected rainwater remains outside of the building or satisfies the requirements of Section 1105-08 below.
(Ordained by Ord. No. 67-1996, eff. Apr. 5, 1996; a. Ord. No. 357-1998, eff. Oct. 16, 1998; repealed and reordained by Ord. No. 415-2001, eff. Dec. 19, 2001; a. Ord. No. 59-2002, eff. March 28, 2002; a. Ord. No. 057-2012, § 1, eff. March 29, 2012; a. Ord. No. 085-2013, § 1, eff. May 10, 2013)