Is a 2% slope more effective for directing water away from foundations than a flat surface?

A 2% slope is indeed more effective for directing water away from foundations compared to a flat surface. This slope facilitates drainage by ensuring that water flows away from the base of the building rather than pooling around it. A flat surface does not encourage water movement, which can lead to problems such as erosion, foundation damage, or water intrusion into basements. Proper grading with a slight slope promotes effective drainage management and prevents water from collecting near foundations, significantly reducing the potential for structural issues over time.

While factors like soil type or rainfall intensity can influence drainage effectiveness, the fundamental design principle of maintaining a slope for water runoff is widely recognized in construction and landscaping. This is why emphasizing proper drainage through sloping surfaces is crucial for the longevity and integrity of building foundations.