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Council only specify total volume via litres per m2 of roof. If you want to use 1500D ones it won't be a problem as long as you have room to get them in. I remember there was a big jump over 1500D particularly for trafficable lids.

Southern WA, sandy area. $4780 3 1200D/1200H wells supplied amd installed with trafficable lids 4 1500D/1200H wells supplied and installed with trafficable lids 2 weekends for connecting them up to downpipes, hand digging most due to limited room. Roughly $400 for pipes and fittings.