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<br />... <br /> <br />5.A.(7)(a) Filter design for all chimney drains, filter <br />blankets,. and toe drains must be acceptable to the State Engineer. <br />The use of geotextiles as a filter material Is not allowed where the <br />drains are not easily accessible for repair or where excavation of the <br />drain can create an unsafe condition at the dam. . <br /> <br />5.A.(7)(b) Underdrains and' collection pipes shall be con- <br />structed using noncorrodible materials. <br /> <br />.5.A.(7)(c) Rock rlprap shall be well graded, durable and sized <br />to withstand wave action, or channel velocities, and shall be placed <br />on a well-graded pervious sand and gravel bedding or geotextl1e. Soil <br />cement, designed and constructed in accordance with the principles <br />defined In the 'Design of Stnall Dams', United States Department of the <br />Interior, Bureau of Reclamation,. Second Edition, 1973, 1977 revised <br />reprint, U.S. Government Printing Office, Washington, D.C., 20402, <br />which, is hereby Incorporated by reference Into this rule, and does not. <br />Include later amendments to, H or editions of, the Incorporated <br />material, may be used in lieu of rock riprap. <br /> <br />5.A. (7)(d) All outlet systems shall be designed and Installed <br />In a manner acceptable to the. State Engineer and meet the follOWing <br />criteria: <br /> <br />5.A.(7)(d)(l) The outlets for Class I dams shall be capable <br />of releasing the top five feet of the reservoir capacity in five days, <br />and for all other classes of dams as required by tbe State Engineer. <br />In addition, outlets shall be capable of passing Inflow to the <br />reservoir with a minimum of ten feet of head, in order to meet the <br />demands of downstream senior water rights, and the owner's release <br />requirements. <br /> <br />5.A.17l(d)(lll All princIpal outlets connected to , pipeline <br />shall have a by-pass va ve whiCh wi 1 meet the capacity cr,terla as <br />defined In Rule 5.A.(7)(d)(I) above. <br />5.A.(7)(d)(III) Outlets for all dams, except for dams with <br />ungated outlets, shall have an operating or guard. gate Installed at <br />the upstream end of the conduit. Installations where the gates are <br />located within the dam may not require guard gates If It is determined <br />that the safety inspection of the dam will not require Inspection of <br />the outlet upstream from the gate, in accordance with criteria set <br />forth in 'ACER Technical Memorandum No.6' USDI, Bureau of <br />Reclamation, Denver, Colorado, November 19B5, which Is hereby <br />. incorporated by reference Into this rule, and does not include later <br />amendments to, or editions of, the Incorporated material. <br /> <br />. 23 - <br />