John Hunyadi, P.E. Dam Safety Engineer General Orientation on Dams Classification, Terminology, Types of Construction, etc.

Hazard Classification Based on an evaluation of consequences of dam failure absent of flooding conditions Assumes the reservoir is at the high water line.

Types of Dams Embankment Dams − Earthfill – zoned vs. homogeneous − Rockfill – usually faced (concrete, asphalt, etc.) − Combination – rockfill for structural strength, earth zones for impervious barrier Concrete Dams − Gravity − Arch Rueter Hess Gross Dam

Embankment Dams Quincy McLellanHomestake

Evergreen Concrete Dams (less than 3% of dams in Colorado) Strontia Springs

Typical Dam Section Phreatic Surface Freeboard

Typical Dam – Common Terms Source: U.S. Department of Agriculture, Forest Service, Missoula Technology and Development Center, 2012

Typical Dam – More Terms “ freeboard dike ”, “ auxiliary dam ”, “ blind dam ”

Typical Dam – Outlet Works Source: U.S. Department of Agriculture, Forest Service, Missoula Technology and Development Center, 2012

Typical Dam – Outlet Works (cont.) Source: U.S. Department of Agriculture, Forest Service, Missoula Technology and Development Center, 2012

Typical Spillway RESIDUAL TOTAL FREEBOARD

Questions?