Developer: Hwa Chong Institution
Main Con: Nanjing Dadi Construction Pte Ltd
Architect: Surbana International Consultants Pte Ltd
Date Completed: 2015
About the Project:
Hwa Chong Institution (HCI) is an independent school in Singapore for students aged 12 to
18 covering both secondary and pre-university levels. The institution is the culmination of
the watershed merger between the former Chinese High School (founded in 1919) and Hwa Chong
Junior College (founded in 1974) in 2005. Throughout the years, Hwa Chong Institution has
nurtured leaders and produced top scholars for the nation in the highest echelons of research,
industry and government. In 2013, it proceeded with the construction of its building
expansion to cater for the rapid growth of students, as well as other additional learning
Netatech Engineering was brought onboard as the Irrigation specialist to design and build the Irrigation system network to both serve the landscape and greenwalls designed by Surbana Architects. Aligning with Surbana and HCI’s green direction for water sustainability, the system incorporated an underground Rain Harvesting Tank that was sufficient enough to irrigate the entire landscape for 3 days without rain events. Rain water is harvested via the building’s perimeter drain, which flows down from the building’s roof. Before the rain water goes into the tank, several sediment strainers were also put in place to take away leaves, stones and particles from entering the tank so that it mitigates complication downstream when water is being pumped out for irrigation and lowers the regular maintenance needed for the tank.
Located right next to the tank is where the Irrigation Pump Room is located. In the pump room is where most of the head control components (pumps, filters, meters, valves, controllers, etc) is housed. To ensure the rain water supply to the drip lines is properly managed when it is pumped out, a 120 mesh disc filter with auto-back washing capability is installed. Maintenance is lessen when it comes to periodic cleaning of the filter because a self cleaning feature can be pre-programmed into the filter’s control panel, with the option to self clean on either daily, weekly or monthly basis.
The irrigation control system uses an advance controller that allows the user to monitor the physical system online via the cloud server without the need of a physical presence of an engineer on site. It monitors every crucial aspect of the system including water leaks, power failure, unopen water, choked pipe lines, pump failure, unauthorized opening of water, etc. By having this monitoring system in place, it allows Netatech’s Maintenance Team and the Building’s Management Team to efficiently respond to any error notifications sent out via SMS or Email. By incorporating this controller feature into the system, it mitigates the risk of failed irrigation operations, and prevents possible plant death due to such occurrences for both landscape and most critically, the green wall system.
Precision in water distribution to both landscape and green wall system can only be achieved effectively through drip irrigation. Netatech Engineers are able to plan for rain water conservation and simulate hydro zones efficiently through their Irrigation CAD software, ensuring every drop counts when water reaches the root zones of these plants. By executing competent design simulation, water savings are significantly increased and the costs for human labour is decreased. Further water savings is achieved through the Rain Sensor, which are installed at the roof top of the building to prevent auto irrigation operations from running during rain events.