Concrete Slab Rainwater Drainage Issue

Hi,

I'm after a bit of advice; we have just had a 61sqm exposed aggregate slab installed by a concreter which runs from our house in Frankston, Victoria to within 200mm of the neighbours fence. the slab is approx 100 mm above the fence plinth. There is a 65mm Agi pipe which runs along the fence line, under the slab and connects to the stormwater pipe to the road.

I've questioned the size of the Agi pipe with the concreter and he says its suitable for its intended use, but is there any state/federal building code I could reference which states or determines what the min diameter Agi pipe/ grated channel would be required?

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