Drainage options

drainage-standard 5
Standard 5 Straight Drainage Grooves

drainage-standard 5
Standard Recess Either Sloping or Flat

Other drainage examples

drainage lightning grooves
Lightning drainage grooves

drainage curved-grooves
Curved drainage groove

drainage dog leg
Dog legged drainage groove

drainage fishbone
Fishbone drainage groove

drainage wavy
Wavy drainage groove

drainage horseshoe
Horseshow drainage groove

drainage reducing
Reducing drainage groove

drainage fanned
Fanned drainage groove

drainage kingsbridge
Kingsbridge drainage recess

drainage roborough
Roborough drainage recess (think about tap location)