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Stuff You'll Need To Know
1 Cubic Foot of Water Weighs 62.4 Pounds
1 Cubic Foot of Water Contains 7.48 Gallons
1 Foot of Head = .433 PSI
1 PSI= 2.31 Feet of Head
1 Gallon of Water = .13368 Cubic Foot
1 HP (Horse Power) = 745.7 Watts
 
Loss of Pressure Due to Friction
2. 3 X 3.25 = 7.475 PSI
Converting PSI Loss to Head Loss
7.45 X 2.31 = 17.2
Effective or Working Head
196 - 17.2 = 178.8 Feet
Rounded to 179 Feet
 
Basic hydraulic power equation
(CFS X Head / 8.8) X Eff
 
Convert The GPM To CFS
GPM X .13368
or
26.19 X .13368 / 60 = .05835 CFM

 
  
The "Eff" in the equation if made up of the following factors

The Turbine efficiency is first & foremost  Commercial Hydro-Electric turbines have efficiencies of close to 95% or better.  The Banki Crossflow generally has a range of 55% ~ 88% depending on how well you construct it and how well you can construct the gate for it.  Realistically, for a well built system, I'd use 85% in calculations. Anything greater, consider it "Gravy" 

Generator Efficiency is generally about 95% 

Belting & Gearing  V-Belts should be rated about 95% while gears & cog type belts are about 98% efficient.  I'll use 98% in my examples. 
 

Multiplying all these together we get 
Turbine eff * Gen eff * Transmission eff
or 
.85 X .95 X .98  or  .791
 
 
Plugging in the overall efficiency 
(CFS X Head / 8.8) X .791
or 
.056 X 186 / 8.8 X .791 = .901 HP
 
Converting Hp to Electrical Power Is 
 Hp X 745 
or 
.945 X 745 =671 Watts of Electrical Power
 
CFS X 7.41 X 60 
or 
8 X 7.41 & 60 = 3556.8 GPM
 
 
Feet Of Head Loss Per 100 Feet
Pl = (100 / C) ^1.852 X .2083 X GPM^1.852 / Id^4 X .8644
or
Pl = (100 / 150) ^1.852 X .2083 X 3556.8^1.852 / 12.5^4 X .8644
or
Pl=(.667) ^1.852  X  740.88^1.852  /  20736  X  .8644
or
Pl=.4732 X 206430 / 20736 X .8644 = 4.07 Head Loss
 
Plugging in the overall efficiency 
(CFS X Head / 8.8) X .791
or 
8 X 26 / 8.8 X .791 = 18.69 HP
 
Converting Hp to Electrical Power Is 
 Hp X 745 
or 
18.69 X 745 =13924 Watts of Electrical Power
or 
13.9 KW
 
Amps Output
At 208 Volts: 13924 / 280 = 67 Amps
At 240 Volts: 13924 / 240 = 58 Amps