Civil Engineering


AUSPEC 1 is a design guide and construction specification to be used for all large scale engineering works including large lot residential subdivisions, industrial and commercial developments. It covers Geometric Road design, pavement design, stormwater drainage design, and erosion control and stormwater management. Guidelines are available for both former Pittwater and Warringah areas. Contact Council to purchase these documents.

Minor Works Specification

Council's Minor Works Specification covers construction works such as footpath paving, vehicle crossing construction, minor drainage works, kerb and gutter, part-road construction, and other engineering works required as a condition of a Development Consent. For large lot residential subdivisions, industrial and commercial development, Council’s specification for engineering works AUSPEC 1 is to be used.

Stormwater Specifications

On-Site Stormwater Detention (OSD) Technical Specification

OSD is required generally for all developments in the Northern Beaches. This minimises impact on Council’s downstream stormwater drainage system that may result from the proposed development. For single dwellings Council's OSD checklist  can assist in determining if OSD is required. All new developments should be discussed with Council’s Engineers prior to submitting the Development Application. 

Water Management

Councils Water Management Policy consolidates the requirements for the effective management of stormwater, wastewater, groundwater, drinking water and rainwater. The Policy also clarifies development requirements particularly for overland flow and mainstream flooding controls.

Specification for Erosion and Sediment Control – Subdivision/Major Construction Works

The Managing Urban Stormwater – Soils and Construction specification must be used for all subdivision and major construction works which have the potential to cause soil erosion.  The specification includes measures that prevent environmental impacts caused by soil erosion and sedimentation onto adjoining land, drainage systems and receiving waters such as creeks, rivers and lagoons. 

Coastal Engineering

Collaroy-Narrabeen Beach Coastal Protection Works Design Specifications

All coastal protection works should be constructed and maintained in accordance with these specifications, the Northern Beaches Council Coastal Erosion Policy and the CZMP for Collaroy-Narrabeen Beach and Fishermans Beach. Such works must also be, whenever possible, contained on private property.

Narrabeen-Collaroy Fishermans Beach – Criteria for the Siting and Design of Foundations for Residential Development – Geomarine Report

This document provides the criteria for the siting and design of foundations for residential development shown on Council’s Coastal Hazard map.