Div. B › Part 7 › 7.4 › 7.4.10 — Hydraulic Loads

7.4.10.10 — Rain Leaders

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(1) No change in the size of a rain leader with a nominally horizontal offset is required if the offset,

(a) is located immediately under the roof,

(b) is not more than 6 m long, and

(2) If the horizontal offset is more than 6 m long, the rain leader shall conform to Table 7.4.10.9.

(3) The hydraulic load that is drained to a rain leader shall conform to Table 7.4.10.10.

Tables & Figures referenced

Table 7.4.10.9 : Maximum Permitted Hydraulic Load Drained to a Horizontal Storm Drainage Pipe : Forming Part of Sentences 7.4.10.9.(1) and 7.4.10.10.(2)

Loading Table 7.4.10.9…

Table 7.4.10.10 : Maximum Permitted Hydraulic Load Drained to a Circular Rain Leader : Forming Part of Sentence 7.4.10.10.(3)

Loading Table 7.4.10.10…

OBC Definitions

Defined terms on this page

leader

means a pipe that is installed to carry storm water from a roof to a storm building drain, sewer or other place of disposal.

nominally horizontal

means at an angle of less than 45° with the horizontal.

offset

means the piping that connects the ends of two pipes that are parallel.

run

means the horizontal distance between two adjacent tread nosings on a stair.

size

means the nominal diameter by which a pipe, fitting, trap or other similar item is commercially designated.

storm drainage pipe

means all the connected piping that conveys storm sewage to a place of disposal and includes the storm building drain, storm building sewer, rain water leader, catch basin and area drain installed to collect water from the property and the piping that drains water from a swimming pool, other than a public pool, or from water cooled air-conditioning equipment, but does not include, (a)a subsoil drainage pipe, or (b)a private sewage treatment and disposal facility designed for the treatment or retention of storm sewage prior to discharge to the natural environment.

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