FIREFOP:
What is your name ?.
If you REALLY want to generate power, then it is necessary to measure the HEAD ( differential height between the upper intake and the lower exit.
You need to measure the water volume you have available then with these values one can calculate the energy available and the best way to attain the highest power harvesting for what you have.
The in-line generator idea is good but more expensive, though the next would be to use a Y couple to feed the water and the shaft and the propeller placed in the straight section of the Y coupling --the end should exit to the open to obtain maximum power.
Another solution would be a plastic Turgo or Pelton properly fed by the water pipe with the necessary nozzle size and the shaft of the turbine to be coupled to a generator that could be DC or AC, all this depending of what you have available.
A number of small generators will be very expensive and less energy producing than a single one with the pipe without breaks or zigzagging just for the heck of it.
Every pipe change in direction reduces the ultimate available energy, this due to water friction increases.
Particulates need to be filtered in size and hardness to prolong the turbine blades.
So supply the head, the water volume available during dry times and during the wet season, also the length of the pipe.
If you need to buy additional pipe length consider the sewer pipe that is cheaper though not good at the end of the pipe, if the the head is greater than 60 feet (is has lower PSI rating) -- so it is OK for places where the pressure is below 30 PSI.
- feet head = 9.1 meters
- inch may give around 1.5 KW minimum -- INDEED much more if the proper info is supplied -- up to several KW -- I helped a fellow to have 4 KW with a 6 inch pipe and 10 meter head -- so info and you may have a good energy site.
Regards
Nando