Science and Education in Karakalpakstan. 2023 №2/1 ISSN 2181-9203 14
channel flowing into Dautkul was 0.662 mg/l in spring. In Dautkul water, the content of seston in
the upper layer of water is 0.634 mg/l, in the lower layer of water at the bottom of the water is 0.603
mg/l. In winter, the concentration of seston decreases significantly, which is probably caused by the
process of destruction and sedimentation. The content of seston in the upper layer of Dautkul water
is 0.88-0.95 mg/l, in the lower layer it is 0.45-0.47 mg/l. The analysis of the amount of seston
concentration shows that the concentration of mixed dissolved substances in the lake can vary
significantly from year to year.
Lake Mejdureche. Mejdureche is located in the northwestern part of the reservoir, between
Kipchakdarya and Okdarya. The water source is Amudarya. The total area of the water basin is
3000 ha, its length is 9-10 km, and its width is 2-3 km. The maximum depth is 3.5 m, the deepest
place is 1.3-1.8 m.
The waters of Amudarya flowing into the lake are characterized by high mineralization and
general pollution, which increases along the entire river due to collector-drainage and industrial
water discharge. The clarity of the water in Shegekul varies depending on the season and is 0.50-
0.80 m. Water mineralization in Shegekul undergoes drastic changes, minimum as well as
maximum indicators were recorded during all periods of observations in the warm time of the year.
In summer it is 1274-2124 mg/l, and in autumn it is 1240-1270 mg/l.
Figure 3.3. Geographical location of Lake Mejdureche The concentration of dissolved substances in the water area of the lake is different and
changes depending on the season. The content of dissolved substances in the summer season was
0.012-0.556 mg/l, in autumn - 0.310 mg/l (1998), in spring (1999) 0.104-0.671 mg/l, in summer
from 0.0093 mg/l to 0.568 mg/l. It should be noted that the maximum amount of seston was
recorded in the hypolimnion part of the water layer of the lake.
2013-2019 The analysis of the amount of seston concentration during the period shows that
the distribution of dissolved mixed substances is not uniform and its variability is probably due to
the internal regime of the water basin and the introduction of seston by the river flow.
