• Available South Island only
• Effective cross sectional area (with 15mm free board): 6,900mm²
• Flow capacity: 100 litres/min
• Minimum recommended fall: 1:500 = (2mm in 1m)
• Minimum downpipe size:
• Circular: 80mm

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

Table 3.1.M