Chapter 13

Wells and Pumps for Greenhouses

(draft book excerpts)

Drilled wells are a source of water for many greenhouse operations. They provide clean water with very few impurities. A well is a hole that is drilled, bored, or dug into the ground to reach water. It is usually held open by a pipe, well casing, or a liner. Pumps are an important part of any greenhouse water distribution system. At the source, whether surface water or groundwater, they help deliver raw water to the greenhouse. In the greenhouse, pumps can be used for fertigation, and other pumps can be used for adding chemicals at desired dosages for water treatment. Within irrigation systems, pumps discharge water under pressure to the pipe network for overhead and drip irrigation. Groundwater is found in aquifers that are located below the earth’s crust. As rainfall occurs, some of it evaporates, some of it is removed by plant transpiration and the remaining water filters down through the topsoil and overburden and flows into sand, gravel, and fractured rock.

Click on the following topics for more information on wells and pumps for greenhouses.

Topics Within This Chapter:

  • Aquifers
  • Unconfined and Confined Aquifers
  • Consolidated and Unconsolidated Aquifers
  • Water Wells
  • Well Drilling
  • Well System Components
  • Well Casing
  • Well Screen
  • Gravel Pack
  • Well Development
  • Well Testing
  • Pumps Used for Greenhouse Irrigation
  • Centrifugal Pumps
  • Deep-well Vertical Turbine Pumps
  • Submersible Pumps
  • Axial-Flow (Propeller) Pumps
  • Positive-Displacement Pumps
  • Reciprocating Pumps
  • Rotary Pumps
  • Power for Pumping
  • Centrifugal Pumps
  • Time-of-Use Electric Rates
  • Internal Combustion Engines
  • Pump Performance Parameters
  • Pump Curve Terminology
  • Pump Power Requirements
  • Effect of Speed Change on Pump Performance
  • Pump Curves
  • Reading a Pump Curve
  • Changing Pump Speed
  • Pump Efficiency
  • Net Positive Suction Head
  • Centrifugal Pump Control
  • Stop-Start/Pressure Level Control Operation
  • Throttling Valve Operation
  • Parallel Operation of Multiple Pumps
  • Operation Centrifugal Pumps in Series
  • Pump Speed Adjustments
  • Variable-frequency Drive
  • References