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Capacity Table for Common Size Downpipes

Use this table to select the correct internal dimensions of common downpipe sizes for use in the online calculator at Capacity Calculations.

Downpipe Capacity Table

MaterialSizeNominal
Diameter
(mm)
Internal
Dimension
(mm)
x-Section
Area
(mm²)
PVC65 x 50 65 x 523380
100 x 50 102 x 515171
 65633138
 80764537
 110987626
 16014316157
 20017825157
 25022439840
 28025350823
 31527459610
Steel 75754466
 1001007940
 90x50 90 x 504400
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Clause: 
005_007_002_000_000_000_000_000_000
Clause Number: 
5.7.2
/cop/roof-drainage/outlets-and-downpipes#capacity-table-common-size-downpipes
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

16/12/2019 Removed obsolete column for Roof Area Drained as the online calculator replaces this.