How to create charged wet system for house with mild negative slope?

[LorenClayton]

Hello

My house has a slight negative grade from the street. Front carport and roof gutter are connected to kerb. The 3 rear gutters need to connect to a wet, charged system also to kerb. Moreton Bay Council have approved this. They also recommended a drainage point so I can clean it out. Can you please provide a link to one of these?

I want to buy 4 Bunnings leaf eaters for my 4 downpipes (The $39.95 ones). I understand these help to prevent backflow of water up into the gutters and eaves and also backflow from the kerb.

I understand that a charged, wet system is prone to silt & sludge so how do I access the drainpipes to clean them? Are there easily accessible caps that unscrew? Can you please link to these if so? Or would this be part of the drainage point?

I'm not intending on having a water tank. Is the wet charged system OK with just drainpipes and leaf eaters, and regular maintenance to clear out the system? Please advise what I should be asking the plumber to install so I can do this. Also, should there be some sort of splash diverter for the water which splashes out next to the foundations during heavy rain? I'd rather this than a backflow back up my drainpipes, but excess water near the foundations isn't ideal either.

Also, a rear neighbour has a retaining wall behind the colorbond fence (see photo) and water pools up considerably. Should I install 2 groundwater pits either side in the back yard? Would appreciate some advice here as well.

Please advise the best system for me, preferably with a diagram. Thanks for your help.

site of wet charged system to kerb

[Dave-1]

Morning @LorenClayton 

Mmmmmm on the quiet I would ask a plumber if its allowed. I never like asking council (even tho mine is great ) becuase if they say no then its a really "solid" no in my head Think "wiggly hand" when sea sawing for an answer

Dave