The Letter 'G':  Golf Courses: Friend or Foe?  Gradient: (of a stream or river) The rate of fall of a stream, typically expressed a number of feet of elevation change per mile.  Grooming (Beach Grooming)  Groundwater: Water stored and/or flowing beneath the ground surface, through the pore spaces of subsurface soils and rock.  Gully: A steep sided, v-shaped erosional feature, usually associated with loosely consolidated, fine textured soils. Gullies often form due to runoff over areas where vegetation has been removed and on steep hillsides. *     *     *     SURFRIDER and the SURFRIDER LOGO are registered service marks of Surfrider Foundation Copyright © 2002 Surfrider Foundation All rights reserved