Need to know! Once you sign your Building Contract and pay the balance of your 5% deposit, we order the documents required for your building application, including your stormwater hydraulic design. Your stormwater hydraulic design cannot be finalised until several other documents are received such as your landscape plan, BASIX certificate and arborist report. Because the cost of a stormwater hydraulic design can vary depending on site conditions and expert reports, your Building Contract may include a Provisional Allowance. This is an estimated cost included to help you plan your budget. The final cost is confirmed once the hydraulic design has been completed.
Q1. Can you tell us a little bit about yourself?
I have been in the building industry for over 30 years and a chartered member of the Institution of Engineers for more than 20 years. In 2003, I founded Ibrahim Stormwater Consultants, specialising in stormwater hydraulic design for both project and custom home builders. Since then, we’ve expanded to work with a wide range of builders across NSW. Q2. What is stormwater hydraulics and why is it important when building a home? Stormwater hydraulics is all about managing rainwater, ensuring it drains properly and is safely collected and redirected away from your property. A well-designed hydraulic system does this effectively while also meeting council and NSW building requirements. Q3. What are the key parts of a stormwater hydraulic design? A stormwater hydraulic design is typically required in areas where existing homes are being knocked down and rebuilt. These areas often have stricter council requirements because the original infrastructure was designed for smaller homes with less land coverage. When a larger home is built, it increases rainwater runoff, which can put pressure on the existing system. A stormwater hydraulic design is required to ensure rainwater is properly managed and efficiently redirected away from the new home to meet council requirements. In some cases, a hydraulic design may also be required for a vacant site. This is assessed on a case-by-case basis, depending on council requirements and site conditions.
The final design must then be approved by council or your certifier.
Below are the key elements we consider when designing the best solution for your block: → Hard Surfaces – Surfaces like roofs, driveways and paved areas where water collects. → Soft Surfaces – Lawns and gardens that absorb some water naturally. → Stormwater Pits – Connects the pipe network, collects rainwater and sends it where is needs to go. → Pipes & Channels – Carries water from one place to another. → Gutters & Downpipes – Moves rain from your roof into the drainage system. → Absorption Trenches – A storage system that allows excess rainwater to slowly release into the ground. → On-Site Detention (OSD) – A temporary water storage unit that stores excess water during heavy rainfall and then releases it slowly and safely (often required by NSW councils). → Stormwater Easement – A legally designated area within a property or neighbouring property that provides access for rainwater to be redirected to a point of discharge. → Point of Discharge – The approved location where water leaves your property, like a street kerb and gutter, street drain, easement or natural watercourse e.g. a creek or dam. → Other requirements – Some homes need rain gardens or swales (shallow channels that direct, filter and absorb rainwater) to satisfy council requirements.
Call 13 63 93 | Clarendon.com.au
Clarendon Homes (NSW) Pty Limited. (ABN 18 003 892 706) |
Ground Floor, 21 Solent Circuit, Norwest NSW 2153
|
Builder Licence 2298C
|
12/2025
Made with FlippingBook Publishing Software