IRRIGATION SCHEME FOR AGRICULTURAL AREAS AT BETUMPU AND LIMPAKI

CLIENT: DEPARTMENT OF PUBLIC WORKS

END-USER: DEPARTMENT OF AGRICULTURE

CONTRACT SUM: B$7.6 MILLION

Scheme evaluation involved determining the optimal supply and distribution network to 406 ha of mixed farming allotments.  The source of water was an existing low lying reservoir at Imang, some 10 km from the farm allotments.

Following consideration of engineering practicalities, water quality, endusers, economics, weather regime and dam capacity, major components of the scheme were selected.  They include:-

• an intake structure and pump station with 3 x 150 kw submersible centrifugal pumps

• 11 kv substation and control centre

• a rising main of 175 m running up to a ridge top

          10,000 m³ concrete holding tank

• an 800 mm diam GRP gravity bulk supply main 

          connecting to the agricultural areas

• a 16.4 km of uPVC gravity reticulation network with

          metered water service valves connecting allotments.

Raw water from the reservoir will be filtered and pumped to the holding tank at 220 litres/sec and delivered to the allotments over a 12-hour period at a minimum head of 16 metres.  A SCADA Telemetry System will enable monitoring a control of the system.

Relative advantages of the scheme are: comparatively high residual pressures within the network; only one pumping station; simplicity of construction; easily expanded low level of manpower to operate; and metered valves at allotments enable automatic shutoff and gauging of waterflow for consumer billing.

RECENT PROJECTS:

|BSP STAKEHOLDER CONSULTATION|  |SG. TUTONG EARLY FLOOD WARNING SYSTEM|  |KUALA BELAIT BREAKWATER EA|  

|COASTAL SENSITIVITY MAPPING FOR BRUNEI|  |LANDSCAPE PLANNING FOR UNIVERSITY OF BRUNEI DARUSSALAM|

|EFFECTS OF OVERTRAWLING ON SEABED PIPELINES|  |OPEN SPACE AND RECREATIONAL PLANS|

|AGRICULTURAL IRRIGATION|  |SOLID WASTE AND SEWERAGE INFRASTRUCTURE|  |SITE REHABILITATION SCHEMES|