Section 16. A party desiring to make such improvements shall file a petition therefor with the county commissioners for the county where the greater part of the land lies, setting forth the names of the persons interested, if known to the petitioner, and also in detail the nature of the proposed improvement and the situation of the adjoining land. The petitioner shall give such county security satisfactory to the commissioners that he will indemnify such county from all damages and charges which it is obliged to pay by reason thereof.