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02 9980 1000

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Our team of experienced designers and drafters have a combined total of over 95 years experience in civil design, surveying and drafting fields.


We output a wide range of high quality detail designs and drawings consisting of:


Our in-house civil engineers deliver detailed designs and drawings for all your site needs.


GDS will calculate the peak flow rates prior to commencing the design of main drains and watercourses.


We will then analyse these calculations as a primary consideration when determining the hydraulic grade for your site, ensuring the finished surface level of your developed land is designed to allow for overland water flow through drains and underground pipes.









GDS uses MUSIC Modeling (The Model for Urban Stormwater Improvement Conceptualisation ), a water quality tool which assists the planning and design of stormwater management systems, tailoring  to your land development needs, making sure you achieve water quality targets and requirements for your area.


GDS will accurately assess the performance of stormwater treatment devices and estimate pollutants generated, to provide expert recommendations on the most appropriate stormwater management system for your development.




Contact details

Suite 3A, 265-271 Pennant Hills Road

Thornleigh NSW 2120


PO Box 498

Pennant Hills NSW 1715

Phone: +61 2 9980 1000