Four area residents died in three separate drowning incidents Sunday.

Fairfax County rescue workers yesterday recovered the body of William Franklin Gibson, a 16-year-old Centreville youth, who apparently drowned Sunday night in a reservoir on the Upper Occoquan Sewage Treatment Plant grounds.

Gibson, of 6919 Centreville Rd., had been reported missing at 10:10 p.m. Sunday and county fire and rescue workers immediately began diving operations at the reservoir, where he had been reported fishing since 5 p.m.

Although police found Gibson's fishing pole and an article of clothing by the side of the reservoir, darkness hindered their efforts to locate his body, a police spokesman said.

Rescue workers resumed the search yesterday morning and located Gibson's body at 11 a.m.

A 9-year-old Rockville girl drowned late Sunday afternoon while swimming with her 8-year-old sister in a pool at the Chesapeake House in Sea Colony near Bethany Beach, Del.

Delaware State Police said the girl, Leslie B. Cohan, of 6 Letchworth Circle, Rockville, was last seen at about 5:30 p.m. Her father, Allen Cohan, and several others looked for her, police said, and found her at about 6 p.m. in the deep end of the pool.

The child was taken to Bethany Emergency Room, where she was pronounced dead at 7:44 p.m., police said.

Maryland State Marine police reported that State Park Service divers had recovered the bodies of a Glen Burnie man and his 9-year-old son late yesterday afternoon from the Severn River just outside Annapolis.

Terry Reginold Jones, 27, of 7807C Burton Drive, Glen Burnie, and his son, Michael Harry Jones, were reportedly last seen in the water about 8:30 p.m. Sunday. The father was reportedly teaching his son to swim at the Jonas Green Park area when they fell into a steep drop-off in the water.