Bonds authorized by Section 9-10A-14 shall not be issued until proposed by order or resolution of the board of directors of the watershed management authority specifying the purpose for which the funds are to be used and the proposed undertaking, the amount of bonds to be issued and the rate of interest they are to bear and are approved by the Director of the state Department of Finance. An authority, with such approval, shall have power and is authorized from time to time to issue its negotiable bonds. Said bonds may be issued in one or more series, may bear such date or dates, mature at such time or times not exceeding 40 years from their respective dates, bear interest at such rate or rates, payable in such manner, be in such denominations, be in such form, either coupon or registered, be executed in such manner, be payable in such medium of payment, at such place or places and be subject to such terms of redemption, with or without premium, be declared or become due before the maturity date thereof, as the authority's resolution or resolutions may provide. Said bonds may be issued for money or property at public or private sale for such price or prices as the board of directors shall determine. Said bonds may be repurchased by the authority out of any funds available for such purpose at a price not more than the principal amount thereof and accrued interest, and all bonds so repurchased shall be cancelled. Pending the preparation or execution of definitive bonds, interim receipts or certificates or temporary bonds may be delivered to the purchaser of said bonds. No bonds or other evidence of indebtedness of an authority shall be issued or sold until consent to the issuance and sale thereof shall have been given by the Director of the Department of Finance. A petition requesting such consent shall be filed by such authority with the Director of the Department of Finance. Such petition shall specify the plan or program of the authority and the uses to which it is proposed to put the proceeds of such issue and such other matters as are necessary fully to advise said director of the nature of the purpose, in furtherance of which such issue is proposed, and said petition shall include such other information as may be required by the rules of the Department of Finance. The Director of the Department of Finance shall grant such consent only after he finds that such issue or sale serves some public need and is in the public interest. It shall be unlawful for the authority to use the proceeds of any such issue or sale contrary to the plan and purposes presented to the Director of the Department of Finance in obtaining his consent thereto. The authority applying for such consent is authorized to pay such fees as shall be lawfully assessed against it by the Department of Finance.