312 IAC 10-2-20
312 IAC 10-2-20 "Drainage area" defined
Cite as Ind. Admin. Code tit. 312, r. 10-2-20
Sec. 20. "Drainage area" means the total land area measured in a horizontal plane and enclosed by a topographic divide from which surface
run-off from precipitation normally drains by gravity into a waterway above a specified location. The term includes an area that is ineffective due
to karst topography, subsurface drains, or diversions.