Developer: Ministry of Health Singapore
Main Con: Penta Ocean Construction Pte Ltd
Architect: RDC Architects Pte Ltd
Date Completed: 2015
About the Project:
Changi General Hospital (CGH) is an award-winning public hospital with over 1,000 beds
caring for a community of 1.4 million people in eastern Singapore. After years of excellent
medical services, the existing building was given an extension to serve and provide better
services to their ever growing patients.
Netatech Engineering was awarded for the Irrigation System scope of works and began designing the system in 2012. The specification of the system called for the use of Rain Water as the primary source of irrigation, and supported by top-up water from the domestic source (PUB). Hydraulic engineers at Netatech began designing the system by optimizing both Harvesting Tank and Rain Catchment areas to efficiently cater for the irrigation demand downstream, minimizing the need for domestic water top-up as much as possible. Several other components, such as pre-tank filtration, level sensors, overflows and drainage were carefully considered in the Harvesting Tank’s design in order for it to function efficiently as a delivery containment unit and minimize the need of frequent labour attention/servicing.
To conserve the harvested rain water in the tank, the irrigation system that Netatech built uses only drip irrigation for water distribution to the plants, and is supported by a leak detection mechanism that is linked to the Smart Irrigation Controller that monitors and prevent water losses from main supply pipe leaks, or damaged drip lines in the field. By using drip irrigation, the daily water usage per day is significantly reduced by 35% as compared to other automated irrigation system. Further water savings came from the Rain Sensors which was installed in the building to suspend irrigation operations during rain events.
One key feature which was incorporated into the Irrigation System is the Online Monitoring Irrigation Controller. This is an advance irrigation controller that mitigates the risk of a system failure from possible internal as well as external factors, such as pump malfunction, power failure, clogged filters & pipe lines, burst pipes & water leaks, etc. By having this monitoring system in place, it has allowed Netatech’s Team and the Building Management Team to monitor and react promptly to any fault occurrence in the system once they are received via alert notifications through SMS or Email sent from the controller. To date, the system is performing efficiently and is under Netatech’s Maintenance without any major disruptions.