• Available South Island only
• Effective cross sectional area (with 15mm free board): 5,485mm²
• Flow capacity: 75 litres/min
• Minimum recommended fall: 1:500 = (2mm in 1m)
• Minimum downpipe size:
• Circular: 63mm
• Rectangular: min. cross sectional area of 3250mm²

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

Table 3.1.L