The project PHYMOR aims at studying environmental variability of altitudinal lacustrine systems from the Moroccan Middle Atlas. The main objectives are to:

- To understand hydrological functioning of the hydro-systems and their sensitivity to climate changes;

- To propose a calibration between hydro-climatic parameters and paleo-proxies;

- To reconstruct paleo-hydrological variability based on geochemical studies of lacustrine sediments.

Within the frame of R. ADALLAL PhD-thesis, the first objective was addressed at site Aguelmam Azigza using site monitoring, water isotopic analysis and hydrological modelling.

This water balance requires the knowledge of the lake area–volume-level relationships that were determined by using:

1) A high-resolution elevation model of Azigza watershed using the RTK-GPS combined with the assessment of topographic map scanned

2) A bathymetric map of lake

3) A survey of water level of Azigza lake

The bathymetric survey was carried out using a combination of the Echo Sounder and Global Positioning System (GPS), to generate XYZ data points.

Surfer 12 and ArcGIS 10,2 computer software were used to finalize data evaluation.