I see in many cases it's recommended to put in gravel for drainage. For one example, you are installing a retaining wall. It's usually recommended to put in some gravel behind the wall for drainage. How does this help exactly? You haven't really done anything here except provide a bigger space for water to collect into. But it's not really big enough to hold all the water anyway. It seems that it would be more important to have a place for the water to go to, rather than have a bit of extra room to sit in before overflowing.
- posted
17 years ago