I have been reading many posts and getting more confused by the minute! I am looking at connecting 2 x 90mm round downpipes up to a new tank. Currently one (orange, patio roof) is not connected to anything as it is new. The other connects to an old rubble pit. The water is mainly used for garden use and for the toilet.
Total roof area of the house is around 140sqm with 3 downpipes. Only one of these however will be connected to the new tank (around 60sqm). I will also connect the new patio roof (around 40sqm) to the tank.
It will be a wet (charged) system and I was originally planning on running 2 x 100mm pipes to the tank from the bottom of the downpipes (as they will be stronger) however am now thinking I may be able to join them like the attached diagram. i.e. the 2 orange downpipes will be 90mm round and will then go into 100mm stormwater under ground, joining near the second downpipe then into the tank. The house is in Clontarf, Northside Brisbane.
Is running these 2 x 90mm downpipes into the 1 x 100mm going to be sufficient? Would it be necessary to have a silt trap if it is just being used on the gardens and toilet and there are no trees nearby? Is there anything else I need to be aware of?
i have also read about low restriction inlet and not sure what this is?
Appreciate any advice..