• Available New Zealand wide
• Effective cross sectional area (with 15mm free board): 7,500mm²
• Flow capacity: 112 litres/min
• Minimum recommended fall: 1:500 = (2mm in 1m)
• Minimum downpipe size:
• Circular: 70mm
• Rectangular: min. cross sectional area of 4125mm²

Catchment area per downpipe based on the above flow capacity is given in Table 3.1.G. Use Table 3.1B (Section 3.1.4) to determine the Rainfall Intensity to be used.

Table 3.1.G