Rehabilitation of operation regimes in aged irrigation schemes based on hydraulic simulation

The selection and employment of proper methods in water distribution causes increasing in water productivity and the level of satisfaction of water users. It is faced with more difficulties in aged irrigation projects due to temporal changes such as changes in the crop patterns, development of the command area and destruction of canals and hydraulic structures. The plan of operation methods have some hydraulic and social complexities and therefore is usually simplified or implemented experimentally. This research investigates the best options for water distribution to the paddy fields in a subunit of Sefidroud irrigation scheme based on field survey, recording real data and hydraulic simulation with employing SOBEK hydrodynamic model. Different operation scenarios were defined and then simulated in the current physical state of the scheme through replacing the exhausted intake structures with sluice gates. Finally, the better operation scenarios during the irrigation season were suggested based on the distribution indices. The results show that in spite of the current situation, water loss could reach the minimum by employing modification scenarios and indices of adequacy and equity of water distribution improve.

Knowledge of the Farmers about Water Management Practices in Upper Krishna Command Area of Karnataka

The present study was conducted during the year 2018-20 in Upper Krishna command area to ascertain the knowledge of the farmers towards water management practices. The study was conducted in Vijayapura, Yadgir and Raichur districts of UKP Command Area. Two talukas from each district were selected based on highest irrigated area by UKP project. The talukas selected for the study were Sindagi and Indi from Vijayapura district, Surpur and Shahapur from Yadgir district and Deodurga and Lingasugur from Raichur district, respectively. From each taluks four villages had selected and from each selected villages ten samples had randomly selected. Thus, total sample size was 240. With respect to overall knowledge of the farmers about selected water management practices in command area, more than half (51.67 %) of the farmers had high knowledge level about water management practices, followed by medium (30.00 %) and low (18.33 %).

Performance of Tree Species on Waterlogged Sites of Canal Command Area: A Case Study of Bargi Dam, Jabalpur (Madhya Pradesh)

Bio-drainage is removal of excess soil water through bio-energy of fast-growing tree species having higher transpiration rate. Seven tree species viz. Albizia lebbek, Albizia procera, Acacia nilotica, Dalbergia sissoo, Eucalyptus tereticornis, FRI-4 and FRI-5 clones of Eucalyptus hybrid, Terminalia arjuna and Pongamia pinnata were evaluated for their performance through growth characteristics and biomass studies by planting on waterlogged sites on the bank of Left Bank Canal (LBC) of Bargi command area, Jabalpur district of Madhya Pradesh state (India). Eucalyptus hybrid, followed by Pongamia pinnata exhibited maximum height and biomass accumulation and its allocation to leaves and branches after four years of plantation,attributing the most desirable species for reclaiming waterlogged sites along canal command areas with similar edaphic and climatic conditions.

Optimal Land And Water Allocation Model For The Maximization of Net Agricultural Return In Drought Prone Regions

In this study, the land and water resources allocation model was developed to determine optimal cropping patterns and water resources allocations at different rainfall probability exceedance levels (PEs) to ensure maximum agricultural return in the Hormat-Golina valley irrigation command area, Ethiopia. To account the uncertainty of rainfall variability, the monthly dependable rainfall was estimated at three levels of reliability (20, 50 and 80% PEs) which are representing wet, normal and dry seasons based on regional experience. The irrigation water demand which was used as an input to the optimization model was estimated at each level of reliability by using CROPWAT model. The net annual returns of optimal cropping patterns were estimated as 181, 179 and 175 million Ethiopia Birr at 20 %, 50 % and 80 % PEs, respectively. The result of the optimal cropping pattern indicates that, the net annual return of the command area was increased to 45.75%, 45.84% and 47.01% than the Government targeted at 20%, 50% and 80% PEs, respectively. The findings reveal that the optimal land and water resources allocation model is very useful to the planners and decision makers to maximize the agricultural return particularly in areas where land and water resources are limited.

Socio-economic analysis of Baroda branch canal of Som Kamla Amba irrigation project, Dungarpur, Rajasthan

Irrigation system development results in improvements of farmers' economy, followed by livelihood sustainability, standard of living and social attitude. Present analysis focused on socio-economic status of farming families in the command area of Baroda Branch Canal of Som Kamla Amba Irrigation Project. The study considered survey sampling of 10 per cent beneficiaries in the Baroda branch canal command which consisted 150 farming families having 787 persons in numbers. The socio-economic indicators viz., the family structures, employment pattern, education status, livestock ownership, farm asset distribution, cost of cultivation, and cost of returns were analysed. Results indicated that education and living standards are of farmers was low which may be one of the reasons for not adoption of newly farming technologies. Cost of cultivation per hectare for wheat, barley, gram, and mustard crops were found as Rs. 28,503.00, Rs. 26,727.00, Rs. 21,184.00 and Rs. 21,697.00, respectively and net benefits per hectare obtained from these crops were Rs. 13,297, Rs. 13,023, Rs. 14,416 and Rs. 18,303, respectively. The pattern of ownership of livestock showed that the average number of cows in the command area was about 1.97 per family. The productivity in the area is average due to low inputs use.

Analysis on Adoption of Blackgram Growers in Periyar vaigai Command Area of Madurai District

The IAM Project will bring the policy and institutional development achieved under IAMWARM project to a new level and will serve as the key vehicle for implementing the Tamil Nadu Government agenda in further enhancing water and agriculture productivity in a sub basin framework. Madurai District of Tamil Nadu was purposively selected for this study because Tamil Nadu Irrigated Agriculture Modernization Project was conducted under Tamil Nadu Agricultural University. The foremost objective of the study was to assess the adoption level of respondents in study area. Majority of the TN-IAMP beneficiaries (81.70% had medium level of adoption followed by nearly less than one-sixth of the total beneficiaries (15.80%) possess low adoption and only 2.5% of the beneficiaries had high level of adoption rate in this study.

Comparative Evaluation of Simplified Surface Energy Balance Index-Based Actual ET against Lysimeter Data in a Tropical River Basin

In the past decades, multispectral and multitemporal remote sensing has been popularly used for estimating actual evapotranspiration (ETc) across the globe. It has been proven to be a cost-effective tool for understanding agricultural practices in a region. Today, because of the availability of different onboard sensors on an increasing number of different satellites, land surface activity can be captured at fine spatial and time scales. In the present study, three multi-date satellite imageries were used for the evaluation of remote sensing-based estimation of actual evapotranspiration in paddy in the command area of the tropical Kangsabati river basin. A surface energy balance model, the Simplified-Surface Energy Balance Index (S-SEBI), was applied for all three dates of the Rabi season (2014–2015) for the estimation of actual evapotranspiration. The crop coefficient was calculated using the exhaustive survey data collected from the command area and adjusted to local conditions. The ETc estimated using the S-SEBI-based model was compared with the Food and Agriculture Organization Penman–Monteith (FAO-56 PM) method multiplied by the adjusted local crop coefficient and lysimeter data in the command area. The coefficient of determination (r2) was applied to examine the accuracy of the S-SEBI model with respect to lysimeter data and the FAO-56 PM-based ETc. The results showed that the S-SEBI model performed well with the lysimeter (r2 = 0.90) in comparison with FAO-56 PM, with an r2 of 0.65. In addition to this, the S-SEBI-based ET estimates correlated well with the FAO-56 PM, with r and RMSE values of 0.06 and 1.13 mm/day (initial stage), 0.85 and 0.48 mm/day (development stage), and 0.77 and 0.52 (maturity stage) for paddy, respectively. The S-SEBI-based ETc estimate varied with different stages of crop growth and successfully captured the spatial heterogeneity within the command area. In general, this study showed that the S-SEBI method has the potential to calculate spatial evapotranspiration and provide useful information for efficient water management. The results revealed the applicability and accuracy of remote sensing-based ET for managing water resources in a command area with scarce data.

Impact on Knowledge of Blackgram Growers in Periyar Vaigai Command Area of Madurai District

The World Bank Supported TN IAM (Irrigated Agriculture Modernization) Project is a follow up of IAMWARM presently it was called as (Irrigated Agriculture Modernization and Water-Bodies Restoration and Management) Project which has made significant development and impacts in the Tamil Nadu state by modernizing irrigation infrastructure, improving water use efficiency, enhancing yield and productivity of agriculture in a climate resilient production systems, diversification towards high-value crops, strengthening the institutional reforms through Participatory Irrigation Management (PIM) and Water Users Association (WUA). Madurai District of Tamil Nadu was purposively selected for this study because Tamil Nadu Irrigated Agriculture Modernization Project was conducted under Tamil Nadu Agricultural University. The foremost objective of the study is to assess the knowledge level of respondents in the study area. According to crop production technology aspects revealed that (79.00%) of the beneficiaries possessed knowledge in using VBN 6 variety for cultivation. The study concluded that majority (80.00%) of the beneficiaries were possessed knowledge on (cultural control) fixation of light traps, crop rotation (77.50%) and sowing carry out in proper season.

Liquefaction potential analysis in Palu Bay area

Sulawesi Island has a Palu Koro Fault that actively moves with a high displacement magnitude but low seismicity. On 28 September 2018, at 18:02 local time, an earthquake occurred in Palu Koro Shear Fault. The field investigations along the Palu coast revealed new evidence regarding the extensive liquefaction in these areas, both inland and coastal land. The research command area was located in the Palu Bay coastal area, the Province of Central Sulawesi. The data used was in the form of the Standard Penetration Test of the area, and the potential liquefaction analysis was carried out using the simplified procedure method. Furthermore, to determine the level of liquefaction potential, Liquefaction Potential Index was applied. Geological observations showed that the soil condition in the Palu Bay area was dominated by non-cohesive soil (sand). Based on the liquefaction potential analysis, it was indicated that most of the eastern region of the Palu Bay area showed no liquefaction potential. On the contrary, the western and southern parts were indicated to have liquefaction potentials. The Liquefaction Potential Index analysis results showed that the western and southern areas were dominated with extremely high liquefaction potentials. Meanwhile, in the eastern area, it was extremely low.

Assessing effects of climate change on irrigation water demand in the Lombok River Basin, Indonesia

Irrigation water demand in the command area is affected by rainfall and climate conditions in the river basin. In climate change conditions, rainfall and temperature are predicted to increase and projected to impact irrigation water requirements significantly. Therefore, understanding the climate change effects on irrigation demand in the command area is significant to the river basin manager and planner for managing water resources effectively. This study aims to predict the impact of climate change and irrigation efficiency improvement on the irrigation water requirement in 2032-2040. This study used the CropWat model to estimate irrigation water requirements in 1995-2005 and 2032-2040. Irrigation water demand in the Dodokan watershed as a part of the Lombok river basin was computed using the historical rainfall and climate data from observation stations. Further, the observed data from 2006 to 2014 were projected into climate change in 2032-2040 as an input for the model to predict the demand in corresponding years. Result suggests that the change of annual irrigation water demand in the Dodokan watershed was expected to rise by 1.61% in 2032-2040 compared with 1995-2005, and irrigation efficiency improvement effort would decrease the demand -18.18% in the climate change period.