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.
Underground downspout drain.
Since my in ground pipe ran right past the garage i had the garage downspout dump in as well.
The underground drainage pipe should slope downhill at least 1 8 in.
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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.
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Water pooling in a yard can kill grass attract mosquitoes and create mud patches.
On the house i used downspout adapters with leaf guards.
To do this i cut the black corrugated pipe added a t and aimed the pipe upwards to the downspout.
One of the best ways to get rid of water from a low spot is to simply drain it away through an underground drainage pipe.
Adjust the t connector so that the top side with the drain is flush with the ground.
When the water from the downspout flows into the drain tile system it multiplies several times over the volume of water the drain tile was designed to handle.
Check the vertical pipe.
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But if there is a problem with the underground drain pipes the fix may be a bit more complex.
In the pictures you can see how i connect the downspouts to my pvc system.
Extending downspouts underground beware the pipe to nowhere.
Add an underground drainage pipe.
Install a french drain one of the top yard drainage solutions to divert water away from problem areas.
Rainfall runoff from the downspout will first fill the hole you filled with pea gravel.
If external downspouts aren t doing the job they can be redirected or extended or the adjacent earth can be graded to slope downward away from the foundation.