We have some raised beds which border on to a lawn. The raised beds are watered each night through an automatic irrigation system.
The grass at the side of the beds has become very, very wet - and really never dries out: it is particularly noticeable in the morning after the night watering session. The raised beds drain very, very well.
We have removed a strip of the lawn adjacent to the raised beds - about a foot wide (and thrown the sods away: not particularly good quality grass) - we have dug a trench - about a foot deep today - and going to deepen it another foot tomorrow to make a soakaway.
It is our intention to fill the trench with aggregate(?) - put a permeable membrane over the top and then top with a mix suitable for growing a fresh strip of lawn.
Questions:
Is aggregate the correct thing to fill the trench with - or do I use course gravel - or something else?
What mix (peat/sand/topsoil/???) should I top the trench off with prior to sowing lawn seed?
How deep the "soil" layer?
Any other pointers please.