Utah Admin. Code R655-11-6B - Dam Crest Requirements
A. The
crest width of all dams should be, at a minimum, equal to the structural height
of the dam divided by five plus five feet. The absolute minimum required shall
be 12 feet and the absolute maximum required shall be 25 feet. Wider crest
widths may be used at the designer's discretion.
B. All dams shall have a cross slope on the
crest of 2% to 3% towards the reservoir.
C. All crests shall be protected with a
wearing surface of granular material to prevent vehicular rutting.
D. Dam crests should be cambered to allow for
anticipated settlement. The side slopes of the dam may be steepened to
accommodate the camber.
E. For dams
over 500 feet long which have a crest that dead ends, a turn-around should be
provided at the abutment.
F. The
impervious portion of the dam under the crest may need to be terminated at the
anticipated frost line to prevent desiccation cracking and damage from frost;
however, it needs to be carried high enough to prevent seepage over the core by
capillary rise.
Notes
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