Any bonds issued by Montgomery County or Prince George's County for purposes of providing funds for stormwater management shall remain valid, binding, and enforceable in accordance with their terms, including any provision for a maturity date beyond June 30, 1990. The rights of the holders of the bonds and the responsibilities and obligations of Montgomery County or Prince George's County with respect to the bonds shall not be impaired and shall remain in full force and effect, notwithstanding the repeal, expiration, or other termination, subsequent to the date of issuance of the bonds, of the authority under which the bonds were issued. The responsibility of Montgomery County or Prince George's County with respect to the bonds shall include the responsibility to repay the bonds and to levy taxes for or otherwise guarantee the payment of the bonds.