Hello. I installed a land drain (perforated pipe in pea gravel trench) 3 years ago which runs down one side of the garden towards the house and into a surface water drain. To be honest it didn't seem to work very well as the lawn was always waterlogged.
I am now building a walled patio area which required cutting the ground and land drain and re-routing behind the wall. While the trench was exposed, I noticed that there is no water coming through the perforated pipe but plenty coming through the pea gravel beneath the pipe.
I have attached a sketch.
First of all, is this unusual? And secondly, what is the best way to ensure all this water is captured and transferred to the surface water drain by the house?
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