(d) Zero-percent damage criteria. 



(e) No overtopping allowed. 



(f) Lake level range 3.8 feet. 



(g) Storm surge 2.2 feet. 



(h) Water depth at toe of revetment is 4 feet below minimum 

 lake level. 



(i) Beach slope M = 1:20. 



FIND: 



Revetment type with lowest annual cost (Fig. 5). Consider the 

 following: (a) Riprap, (b) Gabion mat, (c) Lok-Gard concrete 

 blocks, and (d) car tire mat filled with sand cement. 



Maximum Runup Elevation 



Top Lake Range an 









V 



d Storm Surge 



V 



R 





Minimum Lake Level 



V 



6' 





1 1 



"""^-Rev 



evetment 



Tp: 



20 



J I 



Figure 5. Site sketch (section) 



DEFINITIONS: 



T = wave period (seconds). 



H = design wave height at structure toe (feet) . 



H' 



deepwater wave height (unrefracted) (feet) 



d^ = water depth when wave breaks (feet) . 

 d s = water depth at toe of structure (feet) . 

 R = wave runup height above Stillwater level (SWL) (feet) 



PROCEDURES: 



Step 1. Water Level Range : The water level range at the revetment 

 is the sum of: 



lake level range =3.8 feet 



storm surge = 2.2 feet 



6.0 feet 



14 



