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The hydrologic cycle's fundamental component, evapotranspiration, is a crucial parameter for research on climate, hydrology, and water use in agriculture. Efficient water management in agriculture requires an accurate assessment of reference evapotranspiration (ETo). The Food and Agriculture Organization recommended Penman–Monteith (PM) approach is among the most precise models for computing ETo. Nevertheless, this technique requires a comprehensive climate dataset, typically only accessible at a few meteorological observatories. As a result, estimating ETo using a small climatic dataset may be an alternative for water management aspects. Thus, in the current study, 12 temperature, ten radiation, and seven mass transfer-based models were assessed using 31 years of meteorological data (1990–2020) and compared with the traditional PM approach in the semiarid environment of Central Delhi, India. Moreover, ranking different models in data-limited situations was attempted using multi-criteria decision-making (MCDM) techniques viz.,TOPSIS (technique for order performance by similarity to ideal solution) and entropy. Results showed that the Priestley–Taylor (PRTY) and Blaney–Criddle (BLCD) models were found to be the most appropriate alternatives to the PM model, with Pearson's coefficient of correlation (r) values of 0.93 and 0.96, respectively, and mean absolute percentage error (MAPE) values of 13.30 and 21.11%. According to the performance evaluation indices, the performance of the radiation-based models was superior to that of the temperature and mass transfer models. Nevertheless, this ranking would aid in precisely estimating ETo with minimal data, resulting in efficient irrigation scheduling and water resource management. [ABSTRACT FROM AUTHOR]

The world is facing immense pressure due to expanding discourse on resource security. The study is conducted in the water–energy–food (WEF) Nexus context to understand the inter-relatedness of the sectors for sustainable development, eliciting stakeholders' perspectives. Banda District lies in Bundelkhand region of India. It is drought-hit and lacks basic infrastructure and hence has been selected for this research. It is facing challenges stemming from WEF resources insecurity which has triggered mass migration, farmer suicide, unemployment, and indebtedness. In this exploratory research study, nineteen parameters are analyzed using multi-criteria decision analysis and weighted index method to calculate the Stakeholder opinion-based development index (SODI). GIS is used for spatial mapping to characterize the grassroots disparity highlighting the perspective and expectations of the 534 surveyed households. The SODI of Banda District is calculated to be 10.157, which lies in the average category. Most parameters (78.95 percent) fall below the average category, showing that the region is backward and the spatial mapping helps in identifying lacunae in the development of the District. The novelty of this research lies in using the analytical method to examine qualitative parameters that highlight stakeholders' perspectives and usage of unique methodology in formulating the index to study the region holistically for sustainable development. It is concluded with recommendations based on findings using a system-based approach. The modified structural approach of the Stakeholder Opinion-based Development Index and research methodology can be employed for profiling and analyzing the Districts of the same characteristics in and out of India. [ABSTRACT FROM AUTHOR]