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
| Material | Size | Nominal Diameter (mm) | Internal Dimension (mm) | x-Section Area (mm²) |
|---|---|---|---|---|
| PVC | 65 x 50 | 65 x 52 | 3380 | |
| 100 x 50 | 102 x 51 | 5171 | ||
| 65 | 63 | 3138 | ||
| 80 | 76 | 4537 | ||
| 110 | 98 | 7626 | ||
| 160 | 143 | 16157 | ||
| 200 | 178 | 25157 | ||
| 250 | 224 | 39840 | ||
| 280 | 253 | 50823 | ||
| 315 | 274 | 59610 | ||
| Steel | 75 | 75 | 4466 | |
| 100 | 100 | 7940 | ||
| 90x50 | 90 x 50 | 4400 |
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