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Storm drainage shall be provided pursuant to Sections 18-29-1101.2.1 through 18-29-1102.3.
All roofs exceeding 750 square feet (69.7 m
2
) in area shall be drained to a sewer, where such is available in any adjoining public way, or public place. Every connecting roof downspout having the open roof connection, located nearer than 12 feet (3.66 m) to an inside lot line or any door or window on the same premises, shall be trapped on the downspout side of the connection to any sanitary sewer or any combined sewer or drain, and shall be set where not subject to frost.
Exceptions:
1. Nothing in this provision shall prohibit the temporary or permanent disconnection of the roof downspout of a building from the sewer or combined sewer so long as the disconnection does not result in the drainage of water beyond the property lines of the lot on which the building is located, or create a public hazard or nuisance.
2. Roofs of buildings of Group R-2, R-3, R-4 or R-5 occupancy and single-story buildings of any occupancy may be provided with external downspouts discharging onto a paved or landscaped area, provided the water thus discharged can be drained directly to an area drain or catch basin connected to a public sewer, without spilling over onto adjacent property, including the public way, or creating a public hazard or nuisance.
3. If there is a conflict between this section and a site's stormwater management plan approved by the department of water management, the stormwater management plan shall prevail.
(Amend Coun. J. 3-27-02, p. 82090, § 3; Amend Coun. J. 7-29-15, p. 3537, § 4; Amend Coun. J. 10-14-21, p. 37722, Art. XI, § 1)
Outside areas other than roof areas may be drained to a sewer and when paved shall be so drained where necessary to avoid the discharge of water onto adjoining premises. Paved areas of 400 square feet or less where connected to the sewer shall be provided with trapped connections before connecting to any sanitary sewer or combined sewer, with traps placed where not subject to frost. Outside areas exceeding 400 square feet (37.2 m2), and not more than 5,000 square feet (1,524 m2), where connected to sewers, shall be connected through a catchbasin, not less than 3 feet (915 mm) in diameter and not less than 3 feet (915 mm) deep below the bottom of the trap. Areas of more than 5,000 square feet (1,524 m2) shall be provided with a catchbasin not less than 4 feet (1,220 mm) in diameter and not less than 3 feet 6 inches (1,067 mm) deep below the bottom of the trap. To the extent possible, no sheet flow or discharge of stormwater that creates a public hazard or nuisance shall be allowed to adjacent private property or the public way.
(Amend Coun. J. 7-29-15, p. 3537, § 4)
Construction which is tributary to the combined sewer system of the city of Chicago shall be designed to minimize and/or delay runoff inflow contributions to the combined sewer system in accordance with the following:
1. Disconnection. For sites of 5,000 square feet (1,524 m2) in area and smaller, except multiple unit developments, storm runoff will be minimized or
delayed by the disconnection of downspouts, temporary or otherwise, in accordance with Section 18-29-1101.2.1 and any other applicable sections of this chapter and the department of water management design standards.
2. Detention. For sites greater than 5,000 square feet (1,524 m2), and multiple unit developments, storm runoff shall be detained in accordance with, and is required by, the department of water management design standards. The release rate of detained storm runoff shall be managed on the available capacity of the combined storm sewer system as determined by the department of water management.
(Amend Coun. J. 3-27-02, p. 82090, § 3; Amend Coun. J. 11-8-12, p. 38872, § 375)
The conductors and the building storm drain shall be tested in accordance with Sections 18-29-312.1 through 18-29-312.9.
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