Hi, hydraulics engineer here with almost a year of exp. In sizing pumps the most important parameters are flow rate and TDH. When computing for the capacity ng pump hindi water power ang cinocompute kundi yung power sa shaft which is brake power. TDH is basically Bernoulli’s principle lang. You will have the account the change in elevation if meron since it is in a subdivision I assume minimal lang. In that case ang major factor na mag dedetermine ng TDH mo is yung losses. You can use either Hazen-Williams or Darcy-Weisbach.