If water alone doesn't work, you may need to use a plumber's snake or a drain auger. Feed the cable into the top of the downpipe until you feel resistance. Rotate the handle to hook into the clog or break it apart. Once the resistance lessens, pull the snake back out and flush the pipe with water to clear any remaining fragments. If the clog is near the bottom, you can also try feeding the snake upward from the ground. Dismantling the Pipe
Start by checking the gutter outlet, which is the hole where the gutter meets the downpipe. Most clogs happen right at the top. Reach in and manually remove any leaves, twigs, or debris sitting over the opening. If you can see the clog but cannot reach it, a small hand trowel or a stiff wire can help hook the material out. Using a Garden Hose how to clear blocked gutter downpipe
For severe blockages, unscrew or unclip the downpipe sections. Clear each piece over a bin. Reattach securely. If water alone doesn't work, you may need