Missus - 'Out on the patio, there's all this mud and leaves washed down from the garden somehow'
Me - WTF... impossible !
No, its came up the patio drain from a stormwater blockage.
Shoves hose down to clear the blockage, water bubbling up from the gap between the FULLY CEMENTED and fancy pattern patio and the house wall
No water disappearing, stormwater pipe broken under the patio, pissing out from the gap at the wall of the house and a step... maybe has been for years and now has leaves blocking where the pipes have separated.
Be fck'd if I'm digging up the patio.
The back left part of the house all drains into a rainwater tank and the overflow goes down a pipe, that tees into the patio drain, then drops into a common line that is clear... but the patio is fully undercover and gets no rain, so only the rainwater tank overflow.
Easiest solution, get rid of the rainwater tank and route the stormwater line from the back of the house down the fenceline at 1.5m height and tee into the original common stormwater line after it exits the side of the cemented patio pad. I wont see the white pipe as we have a screen around the roofline for privacy... neighbour will get to see it though.
Looks like tomorrow is sorted FFS