Iowa Code § 468.122
In cases where proceedings have been taken for the establishment of a levee or drainage district and an engineer has been appointed who has made a survey, return, and plat thereof and for any reason the improvement has been abandoned and the proceedings dismissed, and afterward proceedings are instituted for the establishment of a levee or drainage district which will benefit any territory surveyed in said former proceedings, the engineer shall use so much of the return, levels, surveys, plat, and profile made in the former proceedings as may be applicable. The engineer shall specify in the engineer's reports the parts thereof so used, and in case the cost of said returns, levels, surveys, plat, and profile made in said former proceedings has been paid by the former petitioners or their sureties, then a reasonable amount shall be allowed said petitioners or sureties for the use of the same.
Iowa Code § 468.122
89 Acts, ch 126, §2