Community fish refuge (CFR) pond monitoring: surface and groundwater study at Sras Ang CFR, Prey Veng Province, Cambodia

Oeurng, C.; Sok, T.; Hout, M. H.; Ich, I. 2024. Community fish refuge (CFR) pond monitoring: surface and groundwater study at Sras Ang CFR, Prey Veng Province, Cambodia. Colombo, Sri Lanka: International Water Management Institute (IWMI). CGIAR Initiative on Aquatic Foods. 29p.

This technical report delves into the essential task of gathering validation data, focusing on surface and groundwater related data monitoring through the deployment of field equipment. The primary objective is to comprehensively monitor surface water and groundwater levels, along with rainfall, on a regular basis. This hydrologic monitoring initiative is conducted within the context of a case study centered on rice-fish systems, specifically community fish refuges (CFRs) in Prey Veng Province, Cambodia.

The selected study area, Prey Veng Province, features a network of community fish refuges. The chosen pond, "Sras Ang", was converted into a fish refuge in 2010 and has a protected status during both wet and dry seasons. The monitoring approach included the installation of instrumentation for continuous monitoring of surface water and groundwater levels, as well as rainfall. Groundwater gradient assessments were conducted, and soil data was collected for further analysis.

The collected data was used to create a preliminary water balance assessment, considering factors such as effective rainfall, surface water runoff and groundwater recharge. The study also incorporated anthropogenic influences, like water abstractions and discharges. The project involved site visits, community meetings, and the establishment of monitoring plans. Rainfall data, potential evaporation rates, groundwater levels, and pond water levels were collected and analyzed to understand the hydrological dynamics of the area.