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Technical Note TN-IV-09
Groundwater Level Data Processing 2: Long-term trends in the Mekong Delta
2021

Groundwater level (GWL) measurements are the most common parameter for hydrogeological interpretations. Long-term GWLs are controlled by the balance among recharge, lateral inflow, discharge and storage and hence show the impact of hydrologic stresses like groundwater abstractions. The purpose of the assessment was:
- to gain on overview over the long-term developments of GWLs in the Mekong Delta for each monitoring well and for the region as a whole,
- to support the provincial Departments of Natural Resources and Environment (DONREs) with insights for their groundwater management as they have to implement the restrictions on groundwater exploitation (based on Decree 167/2018/ND-CP), where GWL drawdown is one of the zoning criteria.
- to compare GWL trends with abstraction data to draw further conclusions on the hydrogeological dynamics.
The Technical Note TN-IV-09 provides annual GWL data for 118 groundwater monitoring wells within the timeframe 1995-2019, 5- and 10- year GWL declining rates across the aquifers and estimated time before reaching GWL thresholds.

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