The secretary of the board of supervisors in any levee district shall hold the office of treasurer of such district, except as otherwise provided herein, and he shall receive and receipt for all the levee taxes collected by the county collector or collectors of the revenue, and he shall also receive and receipt for the proceeds at all tax sales made under the provisions of sections 245.010 to 245.280. Said treasurer shall receive a salary, payable monthly, such as the board of supervisors may fix and all necessary expenses; said board of supervisors shall furnish the secretary and treasurer the necessary office room, furniture, stationery, maps, plats, typewriters and postage. Said treasurer may appoint, by and with the advice and consent of the board of supervisors, one or more deputies as may be necessary, whose salary or salaries and necessary expenses shall be paid by the district. Said treasurer shall give bond in such amount as shall be fixed by the board of supervisors, conditioned that he will well and truly account for and pay out, as provided by law, all moneys received by him as taxes from the county collector or collectors, or as proceeds from the tax sales of delinquent taxes, or from any other source whatever on any account or claim of said district, which bond shall be signed by at least two sureties, approved and accepted by said board of supervisors, and said bond shall be in addition to the bond for proceeds of sales of bonds, which is required by section 245.230. The bond of said treasurer may, if the board shall so direct, be furnished by a surety or bonding company, which shall be approved by said board of supervisors; said bond shall be placed and remain in the custody of the president of the board of supervisors, and shall be kept separate from all papers in the custody of the secretary and treasurer. Said treasurer shall keep all funds received by him from any source whatever deposited at all times in some bank, banks or trust company to be designated by the board of supervisors. All interest accruing on such funds shall, when paid, be credited to the district. It shall be the duty of the board of supervisors to audit or have audited the books of said treasurer of said district June thirtieth of each year, and they shall publish a financial statement within thirty days thereafter showing the amount of money received, the amount paid out during such year, and the amount in the treasury at the beginning and end of such year. The aforesaid treasurer of the district shall pay out funds of the district only on warrants issued by the district, said warrants to be signed by the president of the board of supervisors and attested by the signature of the secretary and treasurer.