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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />~I <br />I <br />I <br />I <br />I <br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3.0 <br />PREVIOUS STUDIES <br /> <br />3.1 SUMMARY <br /> <br />Previous studies performed on the Vouga Dam and Reservoir included a soils and geological <br />investigation of the dam in 1977 and a PMF hydrologic investigation in 1994 by Jim Norfleet, <br />SEO, Division 4. The lOO-year design storm was input into the HEC-l developed for the PMF <br />hydrologic investigation. The principal spillway was sized to pass the 100-year design storm. <br /> <br />The soils and geological investigation performed by Willard Owens Associates, Inc., Wheat <br />Ridge, Colorado in December 1977, was conducted prior to the embankment and spillway raise <br />in 1978. The principal recommendations based on this investigation included: (1) the dam <br />enlargement should be designed as a zoned embankment fill with chimney filter and toe drain <br />components; (2) the spring in right abutment should be drained; (3) the existing foundation <br />should be grouted to reduce the permeability of pervious gravels; and (4) the old spillway <br />should be backfilled and a new spillway should be located west of the dam and cut into the <br />slopes that form the abutment of the enlarged dam. <br /> <br />242161R1.DOC 02.12.97(3:08PM)1RPT <br /> <br />3-1 <br />