Unlike a French drain, this isn't a deep ditch - it should slope at around 4%, so it's a relatively straightforward design. Any water will run off to drains at either end of the swale.

Some Important Pronunciation Notes Like 17, 70 is a magic number in French when the rules start to change. Instead of having a unique name for 70 like there is for 20, 30, 40, 50, and 60, you’ll ...