in a nice garden with a Helli pad ,lucky for the owners the water did not enter the house but flooded the gardens front and back ,and deposited a large amount of clay silt all over the gardens and shingle foot paths to say it was wet underfoot would be a understatement ,when the mains is being pumped its around 700 L/M the house owner was sound and being a large agricultural /plant and skip hire company owner knew what we had to do 
the main was layed in a field before a house was built there