Pump Efficiency ?
•Theoretically, a 1 HP pump provides 10 gpm @ 50 psi from a depth of 280’
  
•In reality, a 1 HP pump with a 10 gpm rating provides 4.6 gpm @ 50 psi from a depth of 280’
• or
• 10 gpm @ 50 psi from a depth of 170’