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, erosion control and stormwater management. Contact Council if you require a copy of the AUSPEC guidelines.

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.

Water Management

Council's Water Management for Development 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.

On-Site Stormwater Detention (OSD) Technical Specification

On-Site Detention (OSD) is generally required for all developments in the Northern Beaches. This minimises the impact on Council’s downstream stormwater drainage system that may result from the proposed development. For single dwellings, Council's OSD Checklist (see Appendix 16 in the Water Management for Development Policy), can assist in determining if OSD is required. All new developments should be discussed with Council’s Engineers prior to submitting the Development Application. 

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 Coastal Zone Management Plan (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.