The petition shall be accompanied by five hundred dollars in cash which shall be deposited with the clerk of the commissioners court of the county in which the largest portion of the proposed district is situated. If the result of the original election is in favor of the establishment of the district, the clerk shall return said deposit to the petitioners, their agent or attorney; otherwise the clerk shall pay the same out upon the vouchers signed by the county judge of such county, for all expenses and costs pertaining to the proposed district up to and including said election, and shall return the balance to the petitioners, their agent or attorney.