CONJUNCTIVE USE PLANNING OF SURFACE AND GROUNDWATER FOR TELHARA DISTRIBUTARY OF WAN RIVER PROJECT.
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Date
2019-08-19
Authors
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Publisher
Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The continuous increase in global population and simultaneous decrease in good-quality water resources emphasize the need of conjunctive use of groundwater and surface-water resources for irrigation. The optimal allocation of water resources can be achieved by employing an appropriate optimization technique. The optimal schedule for command of Telhara distributary of Wan river project, considering conjunctive use of surface water and groundwater, was developed by employing CropWat, AquaCrop, dynamic programming models.
Seasonal and dated crop water production functions were developed with the help of AquaCrop Model and ‘FAO crop water productivity model’ respectively. Using simulation yield data for crops, regression analysis (least square method) was carried out. The square root function was chosen for the crops of command as it has greater coefficient of correlation and F-test value. Then formulation of deterministic dynamic programming (DDP) and stochastic dynamic programming (SDP) were done to allocate water and land seasonally and intra-seasonally (only water) resp. Different scenarios were used for allocation of SW in conjunction with GW and regarding water use efficiency (WUE), wheat equivalent yield (WEY) and total production were determined.
Daily reference evapotranspiration was found maximum (8.76 mmd-1) during the month of May, while lowest (1.25 mmd-1) during the month of January. The maximum ET showed non-uniform decreasing trend for all crops except for wheat which showed non-uniform increasing trend throughout the crop period. Actual evapotranspiration showed slightly non-uniform increasing trend for all the crops
The GW of study area has high EC and TDS, but it is suitable for irrigation use within permissible limit. The scenario having combination of 70%SW+ 30%GW, total production was predicted as more than that of existing scenario. But for scenario 60% SW+ 40% GW, the total production was reduced by 12.45%. In case of conjunctive use scenarios, though simulated WEY yield was increased, the quantity of irrigation water applied was also increased, that’s resulted in decrease in WUE. Therefore it is concluded that up to 30% GW should be used in conjunction with SW to satisfy the water need of crops in the command. Beyond 30%, the use of GW adversely affects the yield in the study area due to higher levels of salinity of ground water.
Description
The present research work was planned for Telhara distributary of Wan river project. The optimal irrigation scheduling was done for rabi season for chickpea and wheat and also for pigeonpea which is a kharif crop. Due to increase in demand for fresh water from domestic, industrial and agricultural sector, water availability for crop at critical growth stages may not be available. This may lead to reduction in crop production. Considering the shortage of fresh water, increase in crop production will be possible through conjunctive use of canal water and ground water, crop water demand calculation and irrigation scheduling for the command.
Keywords
Atmospheric science, Climatology, Altitude, Humidity, Latitude, Precipitation, Relative humidity, Semiarid zones, Weather data, Remote sensing, Wind velocity, Temperature, Crop, Field crops, Pigeonpea, cajanus cajan L., Chickpeas, cicer arietinum L., Wheat, triticum aestivum L., Plant production, Cropping system, Cropping pattern, Production practices, Irrigation scheduling, Irrigation Water, Sowing, Spacing, Water Quality, Water availability, Groundwater, Groundwater table, Harvest index Planting date, Irrigation canal, Crop yield, Soil science and microbiology, soil science, soil water deficit, Surface water, Saline water, Salinity, Statistics and experimentation, Statistical methods, Data collection, Data analysis, Statistics,
Citation
MESHRAM, RAKHI VILAS. (2019).Conjunctive use planning of surface and groundwater for Telhara distributary of Wan River Project. Department of Irrigation and Drainage Engineering.Dr. Panjabrao Deshmukh Krishi Vidyapeeth. Ph. D. 2019. Print. ix 134p. (Unpublished).