We need to understand if the pressure downstream from the micro-turbine is reduced and for how far. A house taking water just before the turbine will have higher water pressure than a house downstream.
Some of the water pressure is translated into energy, hence the drop in pressure.
In a river system this pressure is usually recouped because a section of the river is diverted for the turbines, whilst the rest of the river runs past. The same for an air system with wind turbines.