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<br /> <br /> <br />Figure 5.--The cross section of lawn lake dam following failure. <br />Arrow indicates dark organic layer 4 to 5 ft below top of dam. <br /> <br />Table 1.--Geotechnical characteristics of the Lawn Lake dam earthfill <br />[From the Office of the State Engineer, 1983J <br /> <br />Triaxial shear tests (remolded) <br /> <br />Measured <br />property <br /> <br />Wet density, in pounds <br />per square inch----------- <br />Dry density, in pounds <br />per square inch----------- <br />Moisture, in percent-------- <br />Saturation, in percent----h <br />Voids ratio, in percentu--- <br /> <br />Cohesion (effective <br />stress), in pounds <br />per square inch----------- <br />Friction angle (effective <br />stress), in degrees----u- <br />liquid limit, in percent---- <br />Plastic limit, in percent--- <br />Plastic index, in percent--- <br /> <br />Sample <br />2L <br /> <br />Sample <br />5L <br /> <br />Sample <br />6L <br /> <br />Ground <br />moraine <br /> <br />102.1 115.4 99.5 135.0 <br />87.1 88.9 89.2 <br />17.15 29.8 11. 6 <br />52.3 96.1 38.2 <br />.84 .79 .78 <br /> <br />1.4 0 0 100 <br />18.4 39.2 32.1 45 <br />40 56 no value <br />34 43 nonplastic <br />6 13 nooplastic <br /> <br />11 <br />