Looking at an industry-accepted practice, a Freese and Nichols study examined the use of small slotted drainage pipes in dams.

The Association of State Dam Safety Officials recently featured the findings of Marc Miller, PE, left, and Grady Hillhouse, PE, right, in the Journal of Dam Safety.

The Issue

Internal drains are commonly used to relieve pore pressure and control seepage in dams. These drain systems often include slotted...