Indiana Code Title 36. Local Government § 36-9-27-29

(1) investigate, evaluate, and survey all regulated drains or proposed regulated drains, and prepare all reports, plans, profiles, and specifications necessary or incident to any proposed construction, reconstruction, or maintenance of regulated drains;

(2) prepare and make public standards of design, construction, and maintenance that will apply to all regulated drains and their appurtenances, taking into consideration in preparing these standards the published recommendations made by Purdue University, the American Society of Agricultural Engineers, the American Society of Civil Engineers, the United States Department of Agriculture, the department of natural resources, the United States Army Corps of Engineers, and other reliable sources of information;

(3) supervise all construction, reconstruction, and maintenance work performed under this chapter;

(4) catalog and maintain a record of all surveying notes, plans, profiles, and specifications of all regulated drains in the county, and of all mutual and private drains when available;  and

(5) perform the functions set forth in sections 67 through 69 of this chapter concerning all urban drains under the county surveyor's jurisdiction.