Issue Date: May/June 2012


GEOSTRATA, 2012, May/June, 24-30   The Howard A. Hanson Dam (HAHD) is a critical flood protection and water storage project on the Green River in western Washington. On January 11, 2009, inspectors observed seepage and significant soil loss at the dam while still retaining a record flood pool, indicating that a seepage and piping dam […]

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Categorized as: Embankments Dams and Slopes