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The article deals with the relationship between morphometry and hydrobiological regime. The Shurtan reservoir located in the southern part of the Republic of Uzbekistan is chosen as the Object of the study. Studying the problem of reservoir overgrowth and its connection with morphometry, especially in reservoirs with depth up to 2 metres, and the influence of sunlight penetration, requires application of various research methods. The water level mark in the reservoir during the period of field studies was ∇ 420.325 m, the reservoir water volume was 7.5 million m3 and the water surface area was 7.10 km2. On the basis of application of modern technologies of geoinformation system for assessment of hydrological and hydrobiological processes on the reservoir, an electronic map of the Shurtan reservoir basin was made. The results of the study using GIS technologies showed that the coastal zones of the reservoir bowl are covered with algae (reeds), their area is growing every year. If its area in 2007 was-0.386km2, in 2014 it reached an area of 0.677km2. In 2018, work was done to clear the coastal zones of vegetation, but by 2023 everything is covered with plants again. [ABSTRACT FROM AUTHOR]