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Stormwater Conductors

Capacities of roof drains

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Capacities of horizontal sloped and vertical stormwater and rainwater leaders:

Imperial Units


Pipe Size NPS
(in)
Capacity  (gpm)
Vertical Roof DrainsHorizontal Sloped Pipe
(slope in/ft)
1/8 1/4 1/2
3 90 35 50 70
4 190 80 110 157
5 360 140 200 280
6 560 225 315 450
8 1200 480 680 950
10 860 1220 1728

Metric Units

Stormwater Drain Pipe Capacity

Pipe Size DN
(mm)
Capacity (l/s)
Vertical Roof DrainsHorizontal Sloped Pipe
(slope cm/m)
12.1 4.2
80 5.8 2.1 3.0 4.3
100 12 4.9 6.9 9.9
125 22 8.8 12 18
150 36 14 20 28
200 76 30 43 60
250 54 77 109

Storm Sewer Pipe

Materials used in Building Storm Sewer Pipes according US standards.

Piping MaterialUS Standards
Acrylonitrile butadiene styrene (ABS) plastic pipe in IPS diameters, including Schedule 40, DR 22 (PS 200) and DR 24 (PS 140); with a solid, cellular core or composite wall. ASTM D2661; ASTM F628;ASTM F1488; CSA B181.1; CSA B182.1
Cast-iron pipe ASTM A74; ASTM A888; CISPI 301
Concrete pipe ASTM C14; ASTM C76; CSA A257.1M; CSA A257.2M
Copper or copper-alloy tubing (Type K, L, M or DWV) ASTM B75; ASTM B88; ASTM B251; ASTM B306
Polyethylene (PE) plastic pipe ASTM F667; ASTM F2306/F2306M; ASTM F2648/F2648M
Polypropylene (PP) pipe ASTM F2881; CSA B182.13
Polyvinyl chloride (PVC) plastic pipe (Type DWV, SDR26, SDR35, SDR41, PS50 or PS100) in IPS diameters, including Schedule 40, DR 22 (PS 200) and DR 24 (PS 140); with a solid, cellular core or composite wall. ASTM D2665; ASTM D3034; ASTM F891; ASTM F1488; CSA B182.4; CSA B181.2; CSA B182.2
Vitrified clay pipe ASTM C4; ASTM C700
Stainless steel drainage systems, Type 316L ASME A112.3.1

Materials used in Subsoil Storm Sewer Pipes according US standards.

Piping MaterialUS Standards
Cast-iron pipe ASTM A74; ASTM A888;CISPI 301
Polyethylene (PE) plastic pipe ASTM F405; ASTM F667;CSA B182.1;CSA B182.6; CSA B182.8
Polyvinyl chloride (PVC) Plastic pipe (type sewer pipe, SDR35, PS25, PS50 or PS100) ASTM D2729; ASTM D3034, ASTM F891; CSA B182.2; CSA B182.4
Stainless steel drainage systems, Type 316L ASME A112.3.1
Vitrified clay pipe ASTM C4; ASTM C700
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