Water resources potential in Co To island and exploitation orientation to use

Nguyen Van Dan, Pham Ba Quyen, Bui Xuan Thong, Ho Van Thuy, Hoang Duc Duy


Co To is an island of the Co To district in Quang Ninh province with an area of about 18 km2. Average rainfall on the island is 1,738.8 mm/yr, evaporation is 925 mm/yr. On the island, there are some small streams but they are temporary flow in the rainy season, there is not any natural lakes. There are 2 aquifers. The Quaternary aquifer (q) is distributed in a low terrain with area of about 9 km2, thin thickness and saline water is in about half of the area, so it does not make sense for water supply. The fissured aquifer of the ocdovic-silua (o-s) formation is distributed in the high terrain with an area of about 9 km2, this is low potential water layer. The flow rate in the boreholes in the fractured zone due to tectonic activity can be 1–1.5 l/s, it can satisfy small-scale water supply. Potential groundwater reserve of Co To island is 6,472 m3/day, exploitable reserve is 1941 m3/day, exploited reserve level at C1 range is 1,144 m3/day. This can satisfy the water demand for the living of people on the island today. Small-scale groundwater exploitation in the island has just been beginning, but it has the prospect of replication and at the same time there must be reasonable measures to protect and develop water resources to ensure sustainable development and meet the larger water requirements in the future.


Water resources, aquifer, groundwater potential, Co To.

Full Text:



Pham Ba Quyen, 2013. Final report “Results of detailed investigation and assessment of water resources for construction of water supply works for Co To archipelago”. Archives at the Northern Division for Water Resources Planning and Investigation, Hanoi.

Nguyen Van Dan and Nghiem Duc Nang, 2014. The potential of groundwater resources in Co To island. Journal of Natural Resources and Environment, 198(16), 26–29.

Nguyen Van Dan, Bui Xuan Thong and Nguyen Thi Khanh Hoa, 2018. Potential

of ground water resources on Ly Son island and orientation for exploitation and use. Vietnam Journal of Marine Science and Technology, 18(2), 134–140

Vu Ngoc Ky, Nguyen Thuong Hung, Ton Sy Kinh and Nguyen Kim Ngoc, 2008. Hydrogeology. Transport and Communications Publishing House, Hanoi.

Doan Van Canh, Bui Hoc, Hoang Van Hung and Nguyen Kim Ngoc, 2002. Methods of hydrogeological investigation. Transport and Communications Publishing House, Hanoi.

Nguyen Van Dan, 2013. Assessment of water resources in islands for national defense and economic development. Journal of Natural Resources and Environment, 164(6), 25–26.

Raindrops, 2013. Rainwater and us, 100 using ways of rainwater. Department of Environmental Protection translated and published, Hanoi.

Doan Van Canh and Nguyen Thi Thanh Thuy, 2008. Collect rainwater into the ground. Scientific and Technics Publishing House, Hanoi.

DOI: https://doi.org/10.15625/1859-3097/19/4/14679 Display counter: Abstract : 44 views. PDF : 15 views.

Editorial Office:

Vietnam Journal of Marine Science and Technology

1st Floor, A16 Building, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, Vietnam

Tel: (+84) 024 3791 7411

E-mail: jmst@vjs.ac.vn