S.D. Codified Laws § 46-2A-7.2
The date of receipt affixed to any application submitted pursuant to § 46-2A-7.1 shall be the date of the thirtieth day of the thirty day application period. An incomplete application will be returned to the applicant with notification of the deficiencies. The applicant has thirty days from the date the application is returned to complete and resubmit the application to retain the common priority date assigned to all of the applications. Any application received after the date of the board's decision and prior to the commencement of the thirty day application period shall assume the same priority date assigned to applications submitted during the thirty day application period. The chief engineer shall also accept and hold any application submitted after the thirty day application period but such an application shall take a priority date as of the date of receipt of the application. No more than one irrigation permit application may be accepted for the same acreage.
SDCL 46-2A-7.2