There are many different ways to drain an area. These include subversive drainage to collect underground water with pits and slotted pipe. These need to have fabric wrap around them to ensure no slit build up and block drainage
Drainage from the surface can be collected by gully drains or channel drains. Materials include plastic galvanised and stainless steel in a lot of sites to accommodate any job
Drainage behind the walls is as important as the wall itself as
inadequate DRAINAGE will have serious implications by causing wall
movement. Water proofing needs to be done to certain walls as leaking of
water through walls will affect the front face.