On-Site Detention (OSD)
Design of OSD systems to meet Council requirements, including tank sizing, outlet control pits, and drainage calculations.
Civil Engineering Services
Stormwater Engineering
CATES provides stormwater engineering services for residential, duplex, multi-residential, and commercial developments across Sydney and NSW. We prepare stormwater management plans, drainage designs, and OSD systems for DA, CDC, and CC stages.
What CATES delivers
Water Sensitive Urban Design (WSUD)
Rainwater tanks, bioretention systems, and water quality treatment measures to satisfy Council and State Environmental Planning Policy requirements.
Drainage Design
Pipe network design, pit sizing, overland flow paths, and drainage calculations for DA, CDC, and CC stages.
S68 and S138 Engineering
Engineering design and certification for Section 68 (Local Government Act) and Section 138 (Roads Act) approvals, including kerb and gutter, footpath, and driveway connections.
Stormwater Management Plans
Preparation of stormwater management plans and drainage reports to accompany development applications.
Construction Certificate Support
Detailed design drawings and specifications for CC stage, including compliance with conditions of consent.
Typical development types
- Duplex and dual occupancy
- Multi-residential / boarding houses
- Single dwellings and alterations
- Commercial and mixed-use
- Childcare centres
- Industrial and warehouse
- NDIS and community housing
- Solar farms and rural developments
NSW approval pathways
DA — Development Application
Stormwater management plan and drainage report to accompany the DA lodgement with Council.
CDC — Complying Development
Stormwater design to satisfy the NSW Housing Code and relevant Council DCP requirements.
CC — Construction Certificate
Detailed drainage design drawings and specifications for CC approval, including OSD and WSUD.
Related projects
CATES has delivered stormwater engineering across a wide range of Sydney projects, including duplex developments in Marrickville, Matraville, and Chatswood, boarding houses in Homebush West, and large-scale projects such as the Wollar Solar Farm.
Need stormwater engineering for your project?
Contact CATES to discuss your development and stormwater requirements.
Get in touch