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<br />2.7 The alluvial materials are covered with a blanket of <br />windblown silts and sands a few feet thick. <br /> <br />3.0 Design <br />3.1 Water Levels <br /> <br />. <br /> <br />3.1.1 Maximum water surface: elevation 4448.5. <br /> <br />3.1.2 Top of flood control pool: elevation 4428.5 <br />3.1.J Top of joint use pool: elevation 4404.3. <br /> <br />3.1.4 Top of conservation pool: elevation 4399.0. <br /> <br />3.1.5 Elevation of the river at the site: approx. 4320. <br /> <br />3.1.6 Dam crest: elevation 4454; 5.5 feet of freeboard <br />at maximum high water. <br /> <br />3.2 Outlets <br /> <br />3.2.1 An auxiliary or emergency spillway will be placed <br />on the northeast or left abutment resting directly on the <br />siltstones of the Pierre Formation. The approach and dis- <br />charge will be cut in the Pierre, but will be concrete lined. <br /> <br />3.2.2 A service or operating spillway will be placed <br />on the left abutment at the northeast end of the dam with <br />a concrete crest at elevation 4390 and downstream concrete <br />chute supported on the Pierre. The approach channel, cut <br />into the Pierre is not lined. <br /> <br />3.2.3 An outlet works for the Ft. Morgan canal is on <br />the right abutment at elevation 4339, supported on the Pierre. <br /> <br />3.2.4 A gated structure, high on the left abutment, <br />will control the Riverside Canal. <br /> <br />3.3 Type of Dam <br /> <br />. <br /> <br />The design envisions a rolled-fill dam with a very wide <br />central core of plastic clay with narrower outside shells <br />of sand and gravel. <br /> <br />. <br /> <br />3.4 Earth Dam <br /> <br />3.4.1 An earth emban&~ent dam will be continuous com- <br />mencing 2800 feet northeast of the South Platte River on <br /> <br />4 <br />