This information is provided as assistive only and may not be complete. The revised MCHW documents should be read to confirm the full extent of the technical changes and how they apply to particular work aspects. All liability for the use and interpretation of this information remains solely with the user.

CC 500 – Drainage

1. Where appropriate, clauses have been reworded to allow use of ‘general’ concrete rather than higher grade structural concrete.
2. Table 1.64 Where coarse natural aggregate is used for pipe bedding, the maximum fines content will be f2.
3. In the new WSR schedule 2.1, Marker blocks have been removed as an option. HCD I1 has been removed. All other requirements have been retained.
4. CC 500 Section 22 Drainage Structures now includes thermoplastic structured wall pipes as a material option for drainage structures greater than 900 mm diameter.

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