BigInch is right about this being the overall efficiency of the system. Seeing the information you have provided I believe this is the efficiency that you are looking for.
Please be more specific next time as there are other efficiencies that involove the pump (i.e. volumetric, mechanical...
I am new here so please forgive me if I am wrong. I believe you should add the head loss of 10m to your total head (Ht). Therefore your output power will be higher and so will your efficiency.
The reason for this is because the head loss really creates more head for your pump to have to...
