611. Rights and powers of drainage and other authorities to remain unaffected by Improvement Acts.

The rights, privileges, powers and authorities vested in or to be discharged by any drainage authority are not lessened or altered by the Improvement of Land Act 1864, and no work in connection with improvements may be done to interfere in any way with any sewers, drains or watercourses under the control of any drainage authority: new sewers, drains, watercourses or works of drainage may not be made within the district and jurisdiction of any drainage authority unless previously approved by that authority; and, if and when they are made, they are to be and remain subject in all