What happens if there is a drainage problem which shows up after construction?
Sounds like you’ve had this problem in the past. If a contractor did the installation, you should give him or her a call so they can remedy the situation at no cost to you. I can’t foresee you having this problem if you installed the landscape yourself based on my plans. That is because I note the low spots in the yard and general drainage patterns when I do the site analysis. In a case where water will be trapped as a result of a new walkway, for instance, I would have talked to you about any measures that need to be taken before construction to facilitate proper drainage.