Indiana Code Title 36. Local Government § 36-9-27-17

Sec. 17. (a) Whenever:

the owner shall file with the county surveyor having jurisdiction of the regulated drain for permission to connect the owner's drain with the regulated drain.

(b) The owner shall file with the owner's request the plans and specifications of the private or mutual drain that will be constructed or extended.  However, if the private or mutual drain will have a tiled outlet of twelve (12) inches or less, and the owner alleges this in the owner's request, no specifications need be filed.

(c) If the county surveyor determines that the regulated drain is adequate to handle the additional flow of water, if any, that would result from the connection, and that no harmful pollution is likely to result from the connection, the county surveyor shall grant the request.

(d) If the county surveyor determines that the regulated drain is not adequate to handle the additional flow of water resulting from the connection without being reconstructed, the county surveyor shall deny the request, and the request may not be granted until the regulated drain is reconstructed under sections 49 through 52 of this chapter.