The design of dikes should include consideration of the following 

 (Figure C- I ) . 



Continue ends of 

 dike beyond flood 

 Tlimits 



Riprap 

 2:1 Slopes 



^ Design Flow 



Low Summer 

 Flow — 1 



Low- Flow Buffer 



SECTION A-A 



Figure C-l. Dike design considerations. 



• Side slopes should be stable and riprapped to withstand the flood for 

 which they are being designed (generally 2:1 slope is recommended; see 

 revetment design discussion). 



• Top width is controlled by the requirements of the equipment con- 

 structing the dike. 



• The ends of the dike should be located and designed to keep water from 

 flowing around them. 



• The top of the dike should be at an elevation equal to that of the 

 water surface of the design flow; this water surface profile should be 

 determined using a hydraulic backwater analysis. 



18 



