Peak load plant
Peaking capacity
Peaking power
Peat
Pegmatite
Penstock
Per capita use
Perched water table
Percolation
Percolation rate
Perennial stream
Perennial yield
Perforated pipe
Periodic Facility Review (PFR)
Periphyton
| Permafrost
Permanent wilting point (permanent wilting percentage)
Permeability
permeable
Permeameter
Permeate
Pervious
Pervious zone
Petcock
pH
Philadelphia rod
Photogrammetry
photosynthesis
Phreatic surface
Phreatophyte
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