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-44- <br />would result in a 1 hour rainfall of 7 inches. <br />Three diversion ditches should be placed above the plant area to <br />divert the runoff. The locations of the ditches designated Channel A, <br />B and C are shown on Fig. 2. The following table presents the <br />recommended geometries for the diversion ditches and areas of the <br />drainage basin above each ditch: <br />DRAINAGE DITCHES <br />Drainage Bottom Side <br />Location. Area Width Depth Slopes <br />(Acres) (Ft.) (Ft.) <br />r A 50 4 2.5 1:1 <br />B 15 2 1.75 1:1 <br />C 6 2 1.0 1:1 <br />In addition to the drainage ditches, it may be necssary to <br />install a 48 -inch diameter culvert in the development rods pile which <br />is currently blocking the drainage east of the proposed vat leaching <br />facilities. The culvert will not be necessary if the development rock <br />in this area can be excavated so that the natural drainage is <br />restored. <br />Peak flow runoffs for the diversion ditches and culvert were <br />letermined in accordance with information presented by the Soil <br />Dnservation Service (1977). <br />AGE FROM LEACHED ROCK PILE <br />it Drainability and centrifuge moisture equivalent testing on <br />les of the low -grade uranium ore indicate that gravity drainage of <br />,ids from the leached rock pile will be very low. The test data <br />icates that the maximum percentage of moisture by dry weight which <br />