Sharing results of Weap tool application in the management of water resources
03/02/2015 09:55:23

On 30th January 2015, in the framework of the project “Comprehensive assessment towards water resilience in Da Nang city” funded by the Rockefeller Foundation, the Climate Change Coordination Office (CCCO) of Da Nang city organized the workshop to share the results of applying WEAP model to evaluate and plan water resources in Da Nang city. 


Making an opening speech, Mr. Dinh Quang Cuong, Director of the CCCO emphasized the role and strength of WEAP model in calculating water balance. However, the tool is the software relying much on  input data, thus human is still the main important factor. Mr. Cuong also suggested that workshop participants, based on their research and management experiences, could contribute feedbacks to improve the study results carried out by the Institute of Water Resources of Central Highlands (Main technical consultants of the project). 

Mr. Tran Van Giai Phong, technical manager of ISET, shared that the water resources project is implemented to support the planning of water resources towards resilience to climate change in Da Nang city through (1) assessment of current management state of surface water resources man, (2) assessment of current state of surface water resources, (3) Forecast of surface water resources in the context of climate change and urban development, (4) Forecast of water demand in the context of climate change and urban development, (5) Proposed solutions for water resources management in the context of climate change. Accordingly, this workshop focuses on two main contents: (1) assessment of current state of water resources, (2) forecast of water sources in the context of climate change and urban development through Weap tool.

Weap is the evaluation and planning tool developed by the Stockholm Environment Institute’s U.S. Center since 1988. WEAP provides information about water demand and supply, simulates water demand, water supply, streamflow, water storage, pollution and treatment. WEAP evaluates comprehensively water resources management and development options and implements calculation of water resources for multi-purpose and priority uses.

Presenting study results at the workshop, Mr. Hoang Ngoc Tuan – Director of the Institute of Water Resources of Central Highlands shared that in order to apply WEAP tool, the Institute developed database for WEAP model including topographic data, hydro meteorological data, 41 catchment division, 05 land cover classification map based on the latest land use planning of Quang Nam and Da Nang, weather – hydrology stations, distributaries and salinity. Besides, the Institute also identifies water demands (domestic, commercial, industrial, public, etc), irrigation reservoirs, and hydropower. Additionally, the Institute also calibrates and validates the model.  


Mr Dinh Quang Cuong – the Climate Change Coordination office discussed at the workshop

The results obtained from the WEAP model were evaluated as following:

- Streamflow at Cau Do River (4.69 billion m3) is much larger than that of Cu De river (0.6 billion m3) and Tuy Loan River, thus, Da Nang city still relies much on Vu Gia River. Especially, in the dry season, streamflow of Cu De River is only one tenth of Cau Do River.

- A number of factors affecting water sources: climate change, reservoir operation, change in forested areas, water demand. Particularly, water demand also emerges for salinity treatment, urban development, and change in agricultural land

- 09 scenarios for water resources including high, medium and low scenarios according to the period by 2020, 2030 and 2050. 

- Forecast of water use: 2012 – 2020, 2020 – 2030, 2030 – 2050. For the Cu De River, flow depends on forecasted rainfall and has no clear trend. Streamflow of dry season is equivalent to 95% frequency of all periods from 1.2 to 1.5 m3/s. More studies need to be done at Hoa Lien dam because of expected water shortage. For the Cau Do River, streamflow changes significantly according to the rainfall with less flows predicted in 2015, 2033, 2042, 2044 and 2046. 

- Water demand increases over time: 20% by 2020 (compared to 2012), 40% by 2030 (compared to 2020), 58% (compared to 2012), doubled by 2050 (compared to 2030), and tripled (compared to 2012).

- Salinity mostly occurs from July – September, and appears in October in some years. The amount of salinity dates is predicted to be from 9 – 90 days, water short around 180,000 to 350,000 m3/day


Mr. Tran Viet Dung, representative of Department of Construction suggested having particular solutions for salinity reduction at Cau Do Water Plant. In addition, Mr. Phong commented to add notice when using the model. Mr. Dinh Phung Bao, Deputy-Director of the Central meteorological Observatory noted that calculation of river section is an important factor in calculating hydraulic and hydrological information, and after floods 1998 – 1999 the river section has been changed, thus, baseline years should be identified; hydro meteorological data should be standardized according to the reports of hydro meteorological sector. In addition, transmission of flood time from Thanh My to Cam Le should be adjusted to around 10 hours, as well as streamflow needed for salinity reduction at Cau Do must be based on streamflow at An Trach. Besised, Mr. Le Hung, University of Technology recommended not using constant salinity, marginal salinity, and choosing baseline year with enough data for reporting.

Concluding at the workshop, Mr. Dinh Quang Cuong emphasized the role of WEAP component and asked the Institute to complete adjusting the report according workshop participants’ feedback as the basis for completing the report to propose to the city on water resources management solutions, especially in the period that Da Nang city is preparing water resources planning.

                                                                                                                Mai Huong



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