1.   If your gutter overflows during a steady rain, then you need a second downspout.

2.   If the water drips too close to the back or the front of the gutter, the gutter will overflow.

3.   Sam saw streets lined with debris, residential dumpsites piled high with rubbish, gutters overflowing with raw sewage.

4.   The gutters will overflow if they are clogged with debris or if the water is not dripping in the exact center of the gutter for its full length.