Ch. 10] 



CONSTRUCTION MATERIALS 



189 



Spillway crest El.439.5 



20' 



10'f^ I El. 455.5 



Stream-bed soils 

 Quartz-mica Schist 



Fig. 8. Rolled fill, Mariposa Dam, Mariposa Creek, California. 



29" 

 Max. pool El. 802.6 J^ TJ^ 1 - 808 - 



"~ll El.778.0 



Pervious i 

 zone 



2' riprap 



immnmnmnm 



Dumped rock r Pervious zone Tuffaceous rock y I Impervious clays' 



Pervious river gravels 



Fig. 9. Rolled fill. Cottage Grove Dam, Coast Fork, Willamette River, Oregon. 



Max. pool EM, 156.8 

 Conservation ~^ = ^ EErs \-7 J , n „ ,151 



poolEI.1,125.0 1 ' 14u " 



r 1,121 .9 i 



4- 



5" crushed stone 



16"riprap x 2 5 



'ELU68.5 10 - 

 T^ ^M 1,150 .5,10' 



2-25 j ^j4i, 139.0 Collector 

 275 it=^^_^/ ditch 



> "' "■"- XSLRItSain \ 



Horizontally stratified sands - 



Pervious zone 



Relief wells 



^-Varied strata sand.and clay shale, and sand stone-^ 

 Fig. 10. Rolled fill, Great Salt Plains Dam, Salt Fork of Arkansas River 



Oklahoma. 



1-6" Dumped rock 



h-Sl'-j El. 779.5 



Dumped rock on 

 6" spalls 



725.1 



Ion 5 



2'-6'ic 2'-6" drains at 15'c.c 



Flood-plain alluvium 



of sands, silts, 



and clay 



Fig. 11. Rolled fill, Hulah Dam, Caney River, Oklahoma. 



