Page 135 - Water Standards
P. 135

shall not be connected vertically. Surface masonry shall be
                                level and good⁃looking.
                             3) The foundation of the drainage system inside the dam shall
                                be compacted. The longitudinal slope of the drainage
                                system  shall  meet  design  requirements, and  the
                                connection shall be constructed well and a filter layer shall
                                be laid. The connection of the drainage system outside the
                                dam shall be watertight and incorporate anti⁃freezing meas⁃
                                ures.
                             4) Other drainage facilities such as a relief well and deep type
                                drainage ditch shall meet design requirements.
                           2  The upstream slope protection shall comply with the following
                       requirements:
                             1) The rock materials used for slope protection shall be hard
                                and solid. The compressive strength and geometric dimen⁃
                                sioning shall meet design requirements.
                             2) The riprap slope protection shall match well with the dam
                                body filling, and ripraping and filling shall proceed simul⁃
                                taneously.
                             3) The stone pitching shall be built from bottom to top with
                                staggered joints, and they shall be dense and stable. Large
                                stones shall be sealed at the edges and the stone surface
                                shall be smooth.
                             4) The precast concrete blocks shall be installed from bottom
                                to top with staggered joints. The surfaces shall be smooth
                                with enough drain holes.
                           3  For the downstream turf slope protection, grass which can
                       take root easily, spreads around and drought⁃tolerant should be
                       chosen. The seeding distribution shall be uniform and they need to be
                       cared for by sprinkling water. If the soil is non⁃cohesive, a layer of
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