(6) There is created a statutory lien in the nature of a mortgage lien upon any project, system or systems acquired or constructed with proceeds of bonds issued by a water authority under this chapter, including all extensions and improvements thereof or combinations thereof subsequently made, the lien shall be in favor of the holder or holders of any bonds issued under this chapter, and all that property shall remain subject to the statutory lien until the payment in full of the principal of and interest, if any, on the bonds. Any holder of the bonds or any of the coupons representing interest on the bonds may, either at law or in equity, by suit, action, mandamus or other proceedings, in any court of competent jurisdiction, protect and enforce the statutory lien and compel the performance of all duties required by this chapter, including the making and collection of sufficient rates for the service or services, the proper accounting thereof, and the performance of any duties required by covenants with the holders of any bonds issued under this chapter. If any default is made in the payment of the principal of or interest, if any, on the bonds, any court having jurisdiction of the action may appoint a receiver to administer the water authority and the project, system or systems, with power to charge and collect rates sufficient to provide for the payment of all bonds and obligations outstanding against project, system or systems, and for payment of operating expenses, and to apply the income and revenues thereof in conformity with the provisions of this chapter and any covenants with bondholders.