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Identification Code

PP00171

Project title

Drainage parameters amplification to optimize soil water-salt regime

Project location

Tajikistan, Khatlon oblast, Gazimalik rayon, state farm "XXIV Pertsyezd"

Rubric

70.23.15

Rubric (SIC ICWC)

01.45.01

Project duration

1988-1992

Project manager

D.Davlyatov, TajikNIIGiM, Tajikistan, Dushanbe, 734001, Shamsy str. 5/1

Summary

Study is directed to drainage parameters optimization, set of measures development on ground water table lowering and soil salination prevention by means of subsurface drainage construction, drainage design and workability improvement. Plot is located between Vaksh and Kafirnigan rivers. Climate is continental, dry. Relief-weakly sloped plain. Soils-loam, saline. Ground water depth is 1.0- 1.5m and salinity is 4-5g/l (February), 1-1.5 g/l (summer), sulfate-calcium-sodium. Irrigated area is 70 ha. Irrigation network is earthen, specific extent 35-36 m/ha, efficiency is 0.58-0.72. Subsurface drainage specific extent is 84 m/ha, depth 1.8-3.5 m. In result of research conclusion is made: system which is perpendicular to ground water flow is the most effective. Most effective is the scheme on lands with high slope gradient (more than 0.01). In this case drain extent is reduced on 25% Due to drain spacing 170-200m.

Key words

Water-salt balance, drainage, effectiveness, ground water table, soil salinity, desalination, yield, cotton

Bibliography

Authors: E.Skvaletssky, D.Davlyatov, A.Ahmerov Title: "Drainage parameters amplification in state farm "XXIV Pertsyezd", TajikNIIGiM, 1990 Results of observations of drainage parameters optimization on the systems under reconstruction, set of measures on ground water table lowering and soil salination prevention is developed based on drainage strengthening and leaching application on background of subsurface drainage.