APo=Pg(hw-d) (6-31) 



KC^A 



2^2= /h...-d\ - C6-32) 



1+7 



Co7^^2 /Pat V^' 



-2 = (Bci)^^'f(l-i") C6-343 



V=(gd)l/2(l+|^) (6-35) 



5e=VtH (6-36) 



(i\2 H 



The ternib in the above equations are defined as follows: 



A = area of ports prorated per foot of chamber width, ft^ 



C^ = coefficient of discharge for orifice 



c^^ = velocity of sound for outside air, ft/s; Cat = 49.1(6)-^'^, 

 where temperature in degrees Rankin = 460 + °F. 



D = depth of narrowest part of the nozzle, ft 



d = undisturbed depth of water at nozzle mouth, ft 



f = friction factor of nozzle 



g = acceleration of gravity, ft/s^ 



H = wave height at nozzle mouth, ft 



hj = elevation of pneumatic chamber ceiling (height of tank) , ft 



h,^ = elevation of water in the pneumatic chamber at the start of 

 the wave, ft 



£ = width of pneumatic chamber in horizontal direction, ft 



p = pressure in pneumatic chamber, measured relative to 

 atmospheric pressure, Ib/ft^ 



354 



