The answer to 'why is my patio drainage problems' is that there are several common causes, including improper grading, clogged drains, and damaged drainage pipes. Symptoms can include standing water, soggy soil, and erosion around the patio.
To fix patio drainage issues, you may need to regrade the area to slope away from the home, clean out debris from drains, or repair or replace damaged drainage pipes. Simple DIY fixes like adding gravel or adjusting the slope may work for minor problems, but more severe issues may require the expertise of a professional landscaper or drainage specialist.