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<br />e <br /> <br />e <br /> <br />e <br /> <br />DAM EMBANKMENT <br /> <br />The Gould Dam (aka Onion Valley Dam), is a large Class I structure. <br />The "Rules and Regulations for Dam Safety and Dam Construction" <br />prepared by the Colorado State Engineer, Division of Water <br />Resources state the following criteria should be met: <br /> <br />* a minimum of 5 feet of freeboar.d, <br />* an outlet pipe capable of draining the top 5 feet of storage <br />in 5 days, <br />* a crest width equal to the vertical height divided by 5 plus <br />10 feet, 25 feet maximum, <br />* a spillway capable of passing 100% PMP, <br />* upstream rip rap to protect the embankment, <br />* and soils investigation and analysis. <br /> <br />Plans and specifications must be prepared and approved by the State <br />Engineer prior to beginning construction. Soils tests and material <br />evaluations will be required to prepare the plans and <br />specifications. <br /> <br />EMBANKMENT: The existing Gould Dam consists of two embankments <br />which are not connected. The dam is in relatively good condition <br />and is not restricted though there are problems with the present <br />spillway size and the condition of the outlet works. The <br />dimensions for the existing primary dam embankment are: <br /> <br />* 55 feet high at a height of 7323 feet, <br />* crest length (both embankments) of about 1710 feet, <br />* crest width of 15 feet, <br />* 3.0H:l.0V upstream and 2.5H:l.0V downstream slopes, <br />* 36 inch diameter metal outlet pipe. <br /> <br />The proposed enlargement of the dam will involve raising the main <br />dam embankment to a crest elevation of 7335 feet and raising the <br />dike embankment to a crest elevation of 7336 feet. The upstream <br />slope on the raised portion of the west embankment would be <br />3.0H:l.OV and the downstream slope will be 2.5H:l.0V with a 15 foot <br />wide crest. The PRC report included soils tests and safety factor <br />evaluations to recommend the embankment shape. <br /> <br />The maximum section of the enlarged primary dam will be an earth <br />embankment with following the dimensions: <br /> <br />* 67 feet high at a height of 7335 feet, <br />* crest width of 18 feet, <br />* 3.0H:l.0V upstream and 2.5H:l.0v downstream slopes <br />* 135 foot extension of existing 36 inch diam. outlet pipe, <br />* a spillway crest 5 feet below the dam crest. <br /> <br />Refer to the PRC report for drawings of the embankment. <br /> <br />Gould Dam <br /> <br />5 <br />