Appendix D-E

Appendix D — Requirements for Design Submission 1 (Master Plan) Sewerage

The sewerage Master Plan shall be submitted in 1:1000 scale on either Al or B1 sheet sizing showing the following:

  • Road and block layout;
  • Block and section numbers, if available;
  • Contours at 0.5 metre intervals; every 5th contour shall display the contour value;
  • Grid co-ordinates on a 500 metre grid; north point and datum reference (e.g. AHD);
  • Type of land use where other than standard residential must be clearly indicated as per the list below;

    OS Open Space
    MDR Medium Density Residential
    HDR High Density Residential
    C Commercial
    I Industrial
    INST Institutional
    SU Special Use
  • Each block other than standard residential shall reflect its EP contribution and any other data which would be necessary to derive this EP contribution;
  • Q1, Q2 and Q100 for any streams, lakes or ponds in close proximity to the proposed sewers;
  • Proposed sewer mains and maintenance hole locations. All sewers greater than DN150 shall display size, critical levels (defined at points where sewers cross other major services such as large water mains, stormwater conduits, floodways and roadways), and grades, especially in lengths where self — cleansing and sulphide — slime control govern design;
  • Catchment boundaries where appropriate following block boundaries;
  • All 'Collection Nodes'**, displaying total contributing:
    1. Equivalent persons (EP's);
    2. Sewered area; and
    3. Peak Wet Weather Flows (PWWF).***

      ** A 'Collection Node' shall be defined as a point on a pipe immediately upstream of a junction of two or more pipes, where the catchment load contribution to that pipe exceeds 100 EP. A node shall be provided for each sub-catchment. Sub-catchment size shall not exceed 100 EP.

      *** All drawings shall reference the formula used for PWWF calculations. Any assumptions other than those in accordance with Icon Water's Water Supply and Sewerage Standards Part 3, Clause 3.1.1 made during the calculations, or EP generation, should also appear on the drawings.
  • Existing sewer mains with surveyed invert levels at connection points and other services;
  • Existing easements, if any;
  • Expected rate of load build-up for key components such as sewage pump stations, rising mains, vortex drops and syphons.

For a sewage pump station, matters to be covered in Design Submission 1 include:

  1. Overall Arrangement:

    A general arrangement sketch showing the location of a pump station in relation to its catchment, inlet mains with critical depths and grades fixing station depth, route of rising main and point of connection to the gravity system, locations of adjacent ponds or floodways with 100 year ARI flood levels, and broad principles of proposed overflow management.
  2. Summary of Main Design Parameters:

    Estimated ADWF, PDWF and PWWF, for full and intermediate stages of development, as well as how these have been arrived at;

    Preliminary sizing for wet well and rising main;

    Estimated sewage detention times (tabulated for both initial and full development) and their consequent impact on hydrogen sulphide emission and management;

    Configuration of pumps;

    General description of control philosophy (e.g. PLC or relays or float switches, preliminary hierarchy of control levels and alarms);

    Any other related issues such as:
    • The need for water top-up in early stages of operation;
    • Availability of power supply;
    • Availability of telephone connection or other provision for remote alarms (what, when and where) etc.

Appendix E — Requirements for Design Submission 2 (Detailed Design), Water supply

Drawings specified below shall include all relevent information as described in Appendix B, AS 1100 and Standard Drawing No. WSS 001. Drawings include:

  1. A key drawing of all hydraulic assets (scale 1:1000) showing layout of reticulation, streets, street names, block and section numbers, easement locations, positions of fittings, valves and hydrants, pressure zone boundaries, drawing numbers, and boundaries of the area covered by each 1:500 detail drawing (see next point);
  2. Detail drawings (scale 1:500 with contours at 0.5 metre intervals) showing a detailed layout of reticulation including the offset from the block boundary, nominal diameter (DN), length of mains, pipe material, pressure class, details of fittings, positions of scour and trench stops, thrust blocks, restrained joints, valves and hydrants, pressure zone boundaries, and the layout of roads and blocks showing connection points of services;
  3. A longitudinal section illustrating depths of excavation, provision for air release and drainage, and where hydraulic design has been the responsibility of the Designer, the plot of the design hydraulic grade line for all:
    • Bulk supply mains;
    • Other sections of main which run across country, including those between reservoirs and built up areas;
    • Other sections of main which are not to be fitted with service branch connections at normal urban subdivision intervals;
    • Other sections of main as specified.
  4. A small scale drawing showing the relationship of the project with the larger area of the whole pressure zone development plan;
  5. Larger scale drawings with details of special anchorages, pressure reducing valve and stop valve chambers;
  6. A copy of any agreements to release service reservations from affected public utilities where water mains on non-standard alignments encroach on their reserves.