Table 2: Selected impulse unit speed drop characteristics

N = normal waterhammer, I = instantaneous waterhammer.
New regulation rank based on speed drop, old from Table 1.

Unit Penstock length (m) Max sound wave a m/s J ratio Waterham ratio 10% Jet time, Te Speed Drop % Regulation rank
New Old
Achachicala 1,532 1,352 2.50 0.134 I 0.90 2.83 5 6
Angostura 1,070 1,252 1.30 0.193 I 0.90 4.91 8 7
Botijlaca 406 1,216 1.14 0.141 N 1.20 6.48 9 9
Cat Arm 2,900 1,100 1.54 0.067 I 0.90 0.99 1 1
Corani 1,158 1,052 1.15 0.080 I 0.80 1.91 3 3
Cuticucho 1,207 1,270 1.08 0.098 I 0.60 2.53 4 4
Miguilla 1,323 1,243 2.54 0.130 I 0.73 1.76 2 2
Santa Rosa #1 330 1,070 1.07 0.225 I 0.60 4.60 7 5
Santa Rosa #2 1,274 1,224 1.05 0.060 I 1.40 3.73 6 8
Zongo #1 1,117 1,292 2.79 0.249 N 2.10 9.74 10 10