Project
manager |
Shuhrat
Mukhamedjanov, SPA SANIIRI
Karasu 4/11,
Tashkent, 700187, Republic of Uzbekistan |
Summary: |
The
study dealt with the following issues:- identification
of quantitative characteristics of ecological and reclamation
processes within old irrigated lands under influence of
gravel lands irrigation;- development
of technical reclamation measures on environmental improvement;- determination
of vertical drainage system efficiency;- influence of
irrigation on the environmental and reclamation conditions;- creation of
groundwater automorphous and semi-automorphous regime;- development
of operation regime that provides the optimal reclamation
conditions under high head of artesian water. Kuva rayon lies
in desert and desert-steppe zone.Lithology: loam,
sandy loam, sand (20 -50m).Irrigation network
is earthen and concrete lined.Drainage network
- open horizontal drains with specific extend of 1,96 m/ha.
Drain’s depth is 2,5 -3,0m, collector’s depth is 4m. Deterioration
of the reclamation state of lands in 1967-1968 caused construction
of vertical drainage wells. Number of vertical wells is
230, well’s discharge is 20 -60 l/sec. The wells are equipped
with screens in upper horizon from 15 m to 40 m. Water table was
0,5-0,8 m during growing period, while it was no lower than
2,0 m during non-growing period.
According to
the research results groundwater extraction regime was developed
for gravel lands irrigation. This allowed to increase drainability
through the flow of groundwater from melkozem to the zone
of aquifers, to keep stable operation of a well, to regulate
water table and hydraulic head, and to reduce salts. |
