^ Your local authority Planning Department deserve congratulations. Almost a textbook swale implemented as part of SuDS, Sustainable Drainage Systems. This will prevent the storm water from the new houses immediately flowing to the nearest watercourse.
You should swing by Park Wood in Ruislip, one day.
We don't have SuDS, but we do have a multi-facetted NFM array.
[Like a supply teacher, I'm only one page of the text book ahead].
^ Your local authority Planning Department deserve congratulations. Almost a textbook swale implemented as part of SuDS, Sustainable Drainage Systems. This will prevent the storm water from the new houses immediately flowing to the nearest watercourse.