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<br />suggested values for K4 are presented in table II. <br /> <br />ftBLE II <br /> <br />SUGGESTED VALUES OF K4 <br /> <br />Embankment Materials or COnstruction <br /> <br />Value <br /> <br />Rock fill with tight clay core <br /> <br />.5 <br /> <br />Zoned rock fill <br /> <br />.75 <br /> <br />Homogeneous tight clay <br /> <br />.75 <br /> <br />Zoned earth fill <br /> <br />1.0 <br /> <br />Homogeneous sandy. silty clay <br /> <br />1.0 <br /> <br />Silty sand with slope protection <br /> <br />1.1 <br /> <br />Sand and silty sand <br /> <br />1.25 <br /> <br />Old hydraulic fill structures <br /> <br />1.5 <br /> <br />The procedure for calculating Qp and developing the dam failure hydrograph is <br />illustrated by example. A fictitious structure. named Log Lake Dam. has the <br />following dimensions: <br /> <br /> <br />A = 75 ACRES <br /> <br />~ <br /> <br />\ <br /> <br /> <br />1/ \;, <br /> <br />v = 650 AC - FT <br /> <br />Figure 3: Log Lake Dam and Reservoir (Fictitious) <br /> <br />The dam was built in 1890 of sandy soils. By reference to table II a value of <br />1.25 is selected for K4. <br /> <br />Worksheet W-l on page 8 was used to compute Tp and Qp for Log Lake. The basic <br />physical data from figure 3 was entered on the top of the worksheet. and <br />values of Kl. K2. and K3 calculated. recognizing that the final values <br />used must be within the upper and lower boundary limits. <br /> <br />5 <br />