Reference March 17, 2019 National Engineering Handbook : Part 630 - Hydrology (Chapter 7 - Hydrologic Soil Groups)
Reference March 17, 2019 System Reliability of Concrete Dams with Respect to Foundation Stability: Application to a Spillway
Reference March 17, 2019 NOAA's Rapid Response to the Howard A. Hanson Dam Flood Risk Management Crisis