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Table 2

Estimation of pipe sizes for various flow rates and associated stormwater loss

Peak discharge (m3/s)Pipe diameter calculated (mm)Commercial pipe size available (mm)Capacity of commercial pipe size adopted (m3/s)Loss of stormwater due to reduced capacity of pipe (m3)% loss of water over analysis period of 9 yearsCost of pipe and installation (AUD$)% change in cost
0.68 633 675 0.79 6,660 
0.41 517 525 0.42 180 0.26 5,010 −25 
0.3 457 450 0.29 558 0.81 4,550 −32 
0.25 425 450 0.29 558 0.81 4,550 −32 
0.2 388 450 0.29 558 0.81 4,550 −32 
0.15 346 375 0.18 1,375 2.00 4,100 −38 
0.1 294 300 0.1 2,664 3.87 3,700 −44 
Peak discharge (m3/s)Pipe diameter calculated (mm)Commercial pipe size available (mm)Capacity of commercial pipe size adopted (m3/s)Loss of stormwater due to reduced capacity of pipe (m3)% loss of water over analysis period of 9 yearsCost of pipe and installation (AUD$)% change in cost
0.68 633 675 0.79 6,660 
0.41 517 525 0.42 180 0.26 5,010 −25 
0.3 457 450 0.29 558 0.81 4,550 −32 
0.25 425 450 0.29 558 0.81 4,550 −32 
0.2 388 450 0.29 558 0.81 4,550 −32 
0.15 346 375 0.18 1,375 2.00 4,100 −38 
0.1 294 300 0.1 2,664 3.87 3,700 −44 
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