Part 6 – Water Supply

6.5    Reticulation

A water main of a minimum of 150 mm nominal bore fitted with fire hydrants (hereinafter referred to as the principal main) shall be laid and on one side of all through-streets and one side of every cul-de-sac to the head of the cul-de-sac, subject to the requirements for hydrant spacing and required flow.

A rider main shall be laid to the road frontage of all lots not fronted by a principal main.  Rider main street crossings shall be kept to a minimum. 

In the case of arterial and dual carriageway streets, principal mains may be required to be laid on both sides of the street. 

In order to provide Fire Fighting Water Supplies in excess of the W3 standard, principal mains shall be laid on both sides of the street (note: generally in Matamata-Piako District a 150NB pipeline barely provides adequate flow to 2 hydrants flowing simultaneously from the same pipeline).  To provide sufficient flow for fire fighting, principal mains may need to be larger than the minimum 150 mm nominal bore; this will depend on the proximity of trunk water mains and the adequacy of the selected pipe size may need to be proved with reticulation flow modelling.  At street intersections the arrangement of pipe connections shall spread fire fighting flow rates to both sides of the adjoining street.

In order to provide Fire Fighting Water Supplies in excess of the FW2 standard, principal mains shall be laid on both sides of the street. To provide sufficient flow for fire fighting, principal mains may need to be larger than the minimum 150 mm nominal bore; this will depend on the proximity of trunk water mains and the adequacy of the selected pipe size may need to be proved with reticulation flow modelling. At street intersections the arrangement of pipe connections shall spread fire fighting flow rates to both sides of the adjoining street.