That means the trench and drainpipe must slope away from the house with at least 1 inch 2 5 cm of fall for every 8 feet 2 4 m of run.
Hillside drainage trench gutters.
We want our drain pipe to have a 1 slope so water will always drain properly.
The amount of collected water increases until it spills over the sides of the gutter.
To prevent erosion make a rock bed around the end of the tube.
The underground drainage pipe should slope downhill at least 1 8 in.
The drainage pipe or drain tile as some call it will lay on a bed of gravel in the bottom of the trench and it is very easy to move this gravel around to properly slope the drain pipe.
The trench should be about 18 inches deep and 9 to 12 inches wide.
Fill the bottom of the trench with large crushed rock setting field stones or larger flat stones into the sides to help shape and support it.
I laid the 2x4 flat on the bottom of the trench placed the level on the 2x4 and every 5 10 feet worked my way from the alley to the house checking the level as i went.
French drains need to have a slope of at least 1 so the force of gravity will work for you.
We researched how long and deep the trench should be.
Depending on the size of your trench either dig the trench with shovels or rent a.
Depending on the trench length and more important the type of soil digging the trench with a shovel can range from relatively easy to downright impossible.
Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out.
We found that the trench needs to be 10 12 inches deep with about a 2 inch slope.
The trench should be at least 6 inches wide and slope down slightly 1 to 2 inches per length of pipe so water drains away from the downspouts.
You don t want a deep steep ditch but a shallow sloping one instead.
We ll make sure the slope is correct by using a 4 foot 1 2 m level.
The gutter slope also called the pitch is the amount the gutter tilts down to let rainwater flow out of it.
From the inlet it would have to be about 1 ft.
So it is not critical that the french drain trench bottom be perfectly sloped it is great if you can manage it but don t get too frustrated over it.
If you had a discharge outlet 100 ft.
Continue until you have completed the trench.
To create the drain you ll have to dig a gradually sloping trench from the source to the outlet.
When i thought i was done digging the trench i used an 8 foot long 2x4 and a level to make sure there was some slope to the bottom of my trench.
If gutters don t slope water gathers in them.
Make sure your downspout extension and connector fit together and on your gutter.
First thing first dig a trench.
You want a gentle slope from the edges of the trench to the center.
Home drainage systems.