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12000000063 Hyatt Dam Inundation Report
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12000000063 Hyatt Dam Inundation Report
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Last modified
12/29/2015 1:25:35 PM
Creation date
2/5/2014 2:00:33 PM
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Loan Projects
Contract/PO #
12000000063
Contractor Name
Farmers High Line Canal and Reservoir Company
Contract Type
Grant
Water District
7
County
Jefferson
Loan Projects - Doc Type
Report
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Input Parameters for Hyatt Lake <br /> h = depth of water above breach invert at time of failure = 5.986345 m 19.6 ft <br /> hb = height of breach = 7.135455 m 23.4 ft <br /> h d = height of dam = 7.135455 m 23.4 ft <br /> V, = volume of water stored above breach invert at time of failure = 961,164 m' 779.2 ac-ft <br /> S = reservoir storage = 961,164 m3 779.2 ac-ft <br /> Ko = 1.4 for overtopping, 1.0 for piping = 1 <br /> Z = breach side slope = 0.7 <br /> Breach Width Equations <br /> Froehlich (2008) <br /> B= 0.27K V W 0.32 h b°.°4 = 24.0 m 78.7 ft <br /> bottom width = 19.0 m 62.3 ft <br /> Von Thun and Gillette (1990) <br /> Cb =function of reservoir size = 6.1 m 20.0 ft <br /> B=2.5hW + Cb = 21.1 m 69.1 ft <br /> bottom width = 16.1 m 52.7 ft <br /> USBR (1988) <br /> B=3(h ) = 18.0 m 58.9 ft <br /> bottom width = 13.0 m 42.5 ft <br /> Failure Time Equations <br /> Froehlich (2008) <br /> tf = 63.2(VW/(g*h b2))05 = 0.77 hours <br /> Von Thun and Gillette (1990) <br /> tf =B/(4h.) (erosion resistant) = 0.88 hours <br /> USBR (1988) <br /> tf = 0.011(B) = 0.20 hours <br /> B = average breach width <br /> Vey =volume of embankment material eroded <br /> tf =failure time <br /> Cb = 6.1 m for VW< 1230000 m3 <br /> Cb = 18.3 m for 1230000 m3 < VW< 6170000 m3 <br /> Cb =42.7 m for 6170000 m3 < VW< 12300000 m3 <br /> Cb = 54.9 m for VW> 12300000 m3 <br />
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