Integrated Flood Management (Ifm) Strategies for a Tidal River Basin: a Case Study of Tutong River Basin Development in Brunei Darussalam (PAP014826)

Código

PAP014826

Autores

K. B. M. Shafiuddin

Tema

Land use and Floods, landslides and erosion

Resumo

Integrated Flood Management (IFM) aims at sustainable development under the risks offlooding minimizing loss of life and property, maximizing the efficient use of flood plains, using theresidual flood flows for irrigation and leaching and restoring and maintaining river health and associatedeco-system and environment. Tidal nature of a river adds yet another dimension/parameter to it forintegration of soil and water quality and quantity issues required for sustainable irrigated agriculture andagro-industry. Traditional flood management is a short-sighted mono-disciplinary 1D model approachhaving persisting shortcomings. In its practice in Tutong river basin, traditional flood management onlyfocusses on how to quickly get rid of the flood flow. The ever increasing and emerging new challengesrequire a multi-disciplinary approach of IFM adoption. River Tutong can be termed as a tidal estuaryhaving salt water intrusion affecting some 25 kilometers in the basin hinterland and severely affectingagriculture and waterworks. There is plenty of rainfall in the basin almost round the year, yet rain-fedpaddy and other crops do suffer for lack of water in between the rainfall events. Farmers have abandonedagriculture from the otherwise arable lands that require irrigation water of quality and quantity from theriver. The IFM for the Tutong river basin requires special attention of more of a Integrated WaterResources Management (IWRM) approach. This paper reviews and attaches special attention to redrawthe traditional stand-alone approach of flood management for Tutong river to be remodeled into anelaborate and effective IFM suitable for Tutong River Basin (TRB). Besides the normal flood disaster,preparedness and proofing events, it would also address the socio-economic, environmental, land andwater development, navigation, aquaculture and eco-system issues pertaining to basin developmentincluding public participation. The Tutong river IFM pre-feasibility study recommends that a major tidalsluice may be built at or near the confluence to the sea with adequate flood flow passage. Coupled withIWRM approach the flood water management in the basin should include peak flood flow passage forflood mitigation, on-stream storage of residual flood flows for compartmentalization and irrigatedagriculture. The use of the residual flood flow for irrigation and waterworks can be achieved by on-streamstorage and controlled release of flood flow. Infrastructure development, institutional management withpublic participation and construction and operation of control sluices at strategic locations would play avital role for overall success of the basin development. Tutong river that appears to be a sorrow of thebasin could potentially be converted into a basin of joy.