To unclog a gutter downspout try your easiest options first.
Unclogging gutter drains.
Remove the guard at the other end of the drain pipe if there is one.
Expose the bottom downspout opening divert the flow away from any landscape drain and then use a garden trowel to reach up into the opening and remove any clogged leaves and debris that could have accumulated there.
Start by cleaning the bottom downspout opening.
Also tip on how to design a clog proof downspout.
5 tips and tricks to clear a clogged downspout.
Pull the underground drain which is often a black.
If your downpipe isn t draining or water is flowing out the back then it s probably clogged.
Although you can t see into these drains cleaning them is similar to a process used to clear debris from the side gutter pipes on your house.
Tap the side of the downspout.
Turn on a garden hose to its most powerful setting and run water through the drain pipe.
First try to dislodge it by feeding a hose into the pipe and hitting the clog with a high pressure nozzle.
If you find that the sump is clogged you can use a small shovel or gloved hands to remove the blockage.
Check to see if water and debris come out the other end of the pipe.
Walk down the ladder one rung at a time gently knocking on the side of the downspout as you go.
If that doesn t work insert a plumbing snake into the pipe and break the clog up manually.
Remember that some drains can be multi directional which means you may need to clean out the basin in every possible direction of the drain.
Disconnect the gutter downspout from where it connects to the drain pipe.