Blockages aren't just caused by autumn leaves. Common culprits include: Downpipe Clearing & Limitations - Grayson's Gutter Cleaning
A downpipe is the vertical pipe (usually round or square, plastic or metal) that channels rainwater from the gutter at your roof edge down to the ground, where it either enters a stormwater drain, a rainwater tank, or a soakaway. A blockage means something is preventing water from traveling freely through this vertical column. Unlike a blocked horizontal gutter (which simply overflows at the eaves), a blocked downpipe creates pressure and backflow that can damage your home’s foundations, walls, and landscaping. blocked downpipe guttering
From personal excavation of my own pipes (a job I do not recommend on a hot day), here are the top five culprits: Blockages aren't just caused by autumn leaves