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Armoring of backfiN slopes -treatment <br />Typical Concrete Pattie <br />,~~is ~KSi?S'~p~',~%~.-~ ~~'~w ,. 12" to 24" <br />,~„, ~~ "'t'~~ n ~~ ~ ~~ - Unmined material Slurry wall Unmined material <br />4' to 7' Concrete patties <br />(flat side facing out) <br />Maximum water level =~" {~`~~~'~`?~ ~`~i~~£,~~£,~~£~~4~"~f~~t"t~{~`~t;'s`~^~s~~t`~ <br />Expected Reservoir _-..:.-=--- .--_ ~~~~£~~~ ~%~~~~,~~,~~~~~~~~%,~~,~~~~~~~ <br />Drawdown depth -'_~°..:~~_::~_~~ ':: "'~3~'€~,~'~~'€~ ~'~'£~r~~,~i~,~J'~,.~/`'~4~~~,~%~t1~iL~,~Y'~~y`'~4~ <br />,., <br />Minimum water level _ .._..._._._.___....__.__._.._._._.__.._._.._ ~ ~ ~ ~,~ r~ ~ ~; ~ ~ ~ ~ ~. ~ ~. ~ <br />...._._.._ .............................._._......_._.......4. <br />_...._...._ ..__..._____._._...----------------- ------ - ~` £~ 'r~ €~ Li` ~ L~` L~ 'off £~ 4~ ~` ~" t"t ~% £$ <br />Pit bottom ___ _-.---.____~.._~.._.._...._..---------_ ',~ 3~ %~ '~ €~ '.~ ~.% L~ ~ '€~ ~ ~"r ~ £i ~ £$ <br />Backfilled slope <br />Placing the concrete patties with the flat side out decreases turbulence with wave action to reduce erosion around the <br />patties. Also, by placing the peaked, rough side in the slope, the roughness provides additional anchoring of the pattie so it <br />doesn't slide down the slope. Patties will be placed on slope edge to edge to reduce the amount of exposed backfill to wave <br />action. Additional broken concrete can be placed in spaces between patties to increase erosion resistance, but is probably <br />not necessary. Additional patties can be buried in backfill material, if available. This improves the strength of the fill slope. <br />