Dig a trench along the desired route of the drain pipe.
Bury your gutter downspout.
Inspect the ground above the buried downspout after the first two or three substantial rainfalls.
Time to take off the old angle off the gutter downspout.
Now time to screw them into place.
Map your downspout burial route check local rules for drainage regulations and contact your local utility offices before you dig.
Take a drill and remove the old screws.
Start laying your drain pipe by attaching a 90 degree angle pipe to the gutter downspout.
Have your downspout extension and connector together then place on your gutter.
Then remove the angle connector.
Cover the inside of the fitting with pvc cement and push it into the lower end of the gutter downspout.
To do this i cut the black corrugated pipe added a t and aimed the pipe upwards to the downspout.
For the garage i used a downspout adapter without a leaf guard since there aren t trees close enough for that gutter to get clogged up.
Use a garden spade to cut.