22. Lake Grassmere Salt Works Zone Volume Two [R, D] 22.4.3. Water Control Activities in Lake Grassmere and Cattle Creek as follows: (a) maintenance of a structure between 10m and 100m below the Cattle Creek rail bridge (No 174) or from 10 metres above the Cattle Creek rail bridge (No 174), to prevent or limit the extent of salt water intrusion into the channels and streams above the rail bridge; (b) maintenance dredging of the bed of Cattle Creek above and below the rail bridge No. 174; (c) works necessary to control and impound stormwater outside storm events, to provide maximum protection for Lake Grassmere from fresh water during storm events. Standards and terms: 22.4.3.1. Maintenance dredging of the bed of Cattle Creek must not cause the bed of Cattle Creek to be either raised or deepened above or below its natural depth. 22.4.3.2. The works necessary to control and impound stormwater must be contained within a distance from 10m immediately above Cattle Creek rail bridge (No 174). 22.4.3.3. Works must not cause impounded water (either saltwater or freshwater) to flood beyond the banks of any creek or drain above its entrance into Lake Grassmere or beyond the banks of Lake Grassmere. Matters over which the Council has reserved control: 22.4.3.4. The structural integrity of the rail bridge. 22.4.3.5. Use of freshwater for stock drinking purposes upstream of the upper physical barrier. 22.4.3.6. Preventing flooding of neighbouring land. 22.4.3.7. Extent of maintenance dredging of the bed of Cattle Creek. 22.5. Discretionary Activities Application must be made for a Discretionary Activity for the following: [C, R, D] 22.5.1. Any activity provided for as a Permitted Activity or Controlled Activity that does not meet the applicable standards. [D] 22.5.2. Land based aquaculture. [D] 22.5.3. Seawater intake and discharge pipes pipelines and associated structures within the Lake Grassmere Salt Works Intake and Pipeline Extension Corridor. 22 – 12