Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out.
Installing underground drainage for gutters.
Where the tube passes by the downspout from the gutter we installed a y fitting and drained the roof water from the gutter system directly into the main drainage line.
Rainfall runoff from the downspout will first fill the hole you filled with pea gravel.
To prevent erosion make a rock bed around the end of the tube.
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