Del. Code tit. 16 § 1421
This chapter shall constitute full and complete authority, without regard to any other law for the doing of the acts and things herein authorized, and shall be liberally construed to effect the purposes hereof; provided, however, that nothing herein contained shall be taken as restricting any control which the Department of Health and Social Services, State Highway Department and the Water Pollution Commission are empowered to exercise over or within any authority.
The foregoing sections of this chapter shall be deemed to provide an additional and alternative method for the doing of the things authorized thereby and shall be regarded as supplemental and additional to powers conferred by other laws and shall not be regarded as in derogation of any powers not existing.
16 Del. C. § 1421