Advice Pls - Neighbour wants to put drainage on my property
After some heavy afternoon storms in Sydney this week my neighbour comes and knocks on my door and tells me "we have a problem". He is not happy about the amount of storm water that is running across his front yard from my property. I put forward the suggestion that his retaining wall that runs two thirds of our boundary is causing the water to back up and flow onto his property at one particular point rather than over the entire length of the boundary. With that he got fired up and didn't want to discuss the matter further, other than to demand that I install drainage that allowed this water to run to the street and not across his property.
BACKGROUND INFO:
Oh his side there is a 500mm tall concrete retaining wall that runs along our boundary from the end of the backyard to the front of the house - a good two thirds of the length of the property border. Storm water pools in my backyard against this wall. Because it can't escape over/through the wall, the bulk of this water is flowing across his front yard where the retaining wall ends. (There are weep holes in this wall but they are not too effective at draining large volumes of water after a heavy downpour). My backyard floods slightly but it does not phase me too much as it tends to drain away withing a couple of hours of the rain stopping.
BACK TO THE STORY
Today the neighbour's wife knocks on the door with a tradie. They are now requesting that this tradie digs a trench and installs ag pipe the length of our property to direct the water to the footpath. The catch - they want it to be done on my property as I have grass/garden beds running the length of the border while the neighbour has a concrete path on his side. They are willing for the work to be done totally at their expense.
I am not so sure about the notion of the work to be done on my side when I don't have an issue with the water. I am racking my brains trying to think of all the potential ramifications. I enquired about the tradie's insurance cover and the scope of the work. He says he has appropriate cover and apparently 5 blokes will dig a trench by hand, lay the pipe and then backfill - no machinery.
What else should I consider?
Will I become responsible in any way for this drainage as it is on my property - i.e. if it becomes less effective over time will it be my responsibility to maintain?
Does the potential exist for the council to instruct me to remove it for any reason?
Should I talk to a solicitor?