Originally Posted by cirdec
1 bringing in some dirt to fill up the sunken part of the backyard
2I read somewhere that the sump drains can be installed vertically, about 4 or 5 feet deep, which will allow the water to drain into the soil by osmosis. Is this correct or am I mistaken?
1 And you might end up with the whole back yard being soggy rather than one area being submerged.
2 These "French drains" never worked for me but it depends on the porosity of your soil.
Try it. Dig a hole, fill it with water, and see how long it takes to empty. There are rules of thumb for evaluating the results.
Design the drain for the 10 year rainfall for your area, and you only have to deal with this creek every 10 years.
If this creek is 6' wide, 6" deep and 80' long it contains ~900 gallons. This is a cube of water 4' on a side.
If it flows 80' per minute this is 900 GPM you'd have to dispose of.
Another option is to fill the swale with bluestone. The water is still there but at least you can walk on the area.
Or put a long, narrow deck over this.