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Oct. 1968 CONCRETE RESERVOIR DESIGN 1191 <br />20-mil PVC Liner Wished Concrete 20-mil PVC Liner Washed Concrete <br />Solvent Weld Joints Sand Solvent Weld Joints) Sand <br />Spike to Side <br />of Trench <br />Pea Gravel •in'• . Pea Gravel <br />• in. Concrete 4-in crated VCP 3 1;- 44n. Perforated VCP <br />3- <br />or Gunite with an Joints With Open Joints <br />or Perforated ACP or Perforated ACP <br />(a) (b) <br />20-mil PVC Liner Washed Concrete 20-mil PVC Liner <br />Solvent Weld Joints Sand Solvent Weld Joints <br />CE <br />4-in. min.. Pea Gravel <br />3-in. concrete 4-in. min <br />or Gunite: 4-in. Perforated VCP <br />With Open Joints <br />or Perforated ACP <br />(C) (d) <br />fished Concrete <br />I Sand <br />`--,Spike to Side <br />of Trench <br />—Pea Gralal <br />-in. Perforated VCP <br />With Open Joints <br />or Perforated ACP <br />Washed Concrete <br />Washed Concrete <br />Sand <br />and <br />-".7 <br />Spike to Side <br />:7.4 <br />4.1n. Perforate <br />E <br />of Trench.. <br />VCP With Open <br />...... <br />6-in. min. <br />Joints or <br />Perforated ACP <br />• <br />•4-in. <br />min. <br />Pea Gravel <br />...... <br />20-mil PVC Solvent <br />4-in. min. <br />Concrete or Gunite• <br />Weld Joints <br />i-I min. <br />All Around <br />Over PVC <br />(a) <br />(1) For Use Where High Water Table <br />Exists.Pea Gravel Placed in Two Stages <br />Using Sides of Box to Separate Gravel <br />From Sand as Materials are Placed. <br />Fig. 9. <br />Variations of Underdrains Incorporating means for Filtering Out Fines <br />All types of underdrains shown have been successfully used. <br />RCHARD BRADY &ASSOCIATES, INC. F-60 <br />25B-1 38 <br />