The first thing to do in deciding about whether or not additional lawn drainage is required is to find out where the excess water is coming from and where should it be going to? It is easy enough to say that high rainfall is the problem but perhaps there is a problem with existing drainage in and around your lawn. If there is already pipe work in place it is worth checking this thoroughly for damage with might allow the water to escape into your lawn. Whatever drainage system is installed, a positive outlet is always required.
Secondly it is worth investigating where the water is going? Is it collecting at a central point in your lawn? Is there surface flooding? All of these questions should be addressed as answering them will give you a good starting point in your quest to put the problem right.
If your lawn is not flat and runs on a slope it is worth seeing where the water stops because - as we all know - water cannot travel uphill so there will be a point at low level where the water collects.
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