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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.
All connections and changes in direction of the storm drainage system shall be made with approved drainage-type fittings in accordance with Table 18-29-706.3. The fittings shall not obstruct or retard flow in the system.
Roofs shall be designed for the maximum possible depth of water that will pond thereon as determined by the relative levels of roof deck and overflow weirs, scuppers, edges or serviceable drains in combination with the deflected structural elements. In determining the maximum possible depth of water, all primary roof drainage means shall be assumed to be blocked.
(Amend Coun. J. 10-14-21, p. 37722, Art. XI, § 2)
Cleanouts shall be installed in the storm drainage system and shall comply with the provisions of this chapter for sanitary drainage pipe cleanouts or as required by the department of water management design standards.
(Amend Coun. J. 3-27-02, p. 82090, § 3; Amend Coun. J. 11-8-12, p. 38872, § 377)
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