Spatial variation of the groundwater level of the Agra district
For the assessment of spatial variation of the groundwater level of the Agra district. Groundwater level data available at NIH Roorkee are used for the analysis. These data were available for the period of four years from 2017 to 2020 for both pre-monsoon and post-monsoon seasons as mentioned in Table 2 in the supplementary file. The prepared polygon shape file of the boundary of the Agra district, Yamuna River and block boundaries are shown in Fig 7 (a, b, c and d). The various observation points of piezometric locations in the Agra district shown in Fig 8. The variation of the groundwater level in the Agra district from the years 2017-2020 was plotted are shown in Fig 10 and 11 (a, b, c and d).
Pre-monsoon season
The average rainfall that occurred in the Agra district in the year 2016 was 770 mm (NASA Power Data accesses viewer 2023).
From Fig 10(a), the groundwater levels in pre-monsoon season of the year 2017 are shown to be very shallow in Achanera (8.60 mbgl), Kheragadh (8.93 mbgl), Fatehpur Sikri (6.79 mbgl), Jagner (9.19 mbgl), Jaipur Kalan (14.70 mbgl) and Etmadpur (12.02 mbgl). While the groundwater is deeper in Fatehabad (27.66 mbgl), Barauli Ahir (24.05 mbgl), Bichpuri (21.94 mbgl), Shamshabad (28.09 mbgl) and Khandauli (22.84 mbgl). In Pinahat (17.07 mbgl), Sainya (18.14 mbgl) and Bah (19.93 mbgl) blocks the groundwater levels are found to be moderate.
The average rainfall that occurred in the Agra district in the year 2017 was 453 mm (NASA Power Data accesses viewer 2023). From Fig 10(b), the groundwater levels in the pre-monsoon season of the year 2018 are shown to be very shallow in Achanera (8.87 mbgl), Fatehpur Sikri (8.62 mbgl), Jagner (10.42 mbgl), Kheragadh (15.47 mbgl), Akola (16.33 mbgl) and Jaipur Kalan (19.91 mbgl) while the groundwater levels are shown deeper in Bichpuri (23.99 mbgl), Pinahat (24.14 mbgl), Fatehabad (29.11 mbgl), Shamshabad (29.88 mbgl) and Barauli Ahir (31.32 mbgl) blocks. In, Etmadpur (21.65 mbgl), Sainya (23.12 mbgl), Bah (23.73 mbgl) and Khandauli (21.82 mbgl) blocks, the status of groundwater levels are found to be moderate.
The average rainfall that occurred in the Agra district in the year 2018 was 858 mm (NASA Power Data accesses viewer 2023). From Fig 10(c), the groundwater levels in the pre-monsoon season of the year 2019 are shown to be very shallow in Achanera (9.0 mbgl), Jagner (10.7 mbgl) and Fatehpur Sikri (13.2 mbgl) while the groundwater levels are deeper in Jaipur Kalan (30.09 mbgl), Bah (31.1 mbgl), Fatehabad (36.4 mbgl), Shamshabad (34.8 mbgl) and Khandauli (29.8 mbgl). In Kheragadh (17.4 mbgl), Akola (18.0 mbgl), Bichpuri (20.4 mbgl), Barauli Ahir (27.20 mbgl), Etmadpur (23.50 mbgl), Pinahat (28.8 mbgl) and Sainya (28.46 mbgl) blocks, status of groundwater levels are found to be moderate.
The average rainfall that occurred in the Agra district in the year 2019 was 697 mm (NASA Power Data accesses viewer 2023). From Fig 10(d), the groundwater levels in the pre-monsoon season of the year 2020 are shown to be very shallow in Achanera (9.0 mbgl), Jagner (12.0 mbgl) and Fatehpur Sikri (15.2 mbgl) while the groundwater levels are deeper in Shamshabad (40.02 mbgl), Fatehabad (37.8 mbgl), Sainya (35.9 mbgl) Bah (32.3 mbgl), Jaipur Kalan (33.6 mbgl), Khandauli (33.1 mbgl) and Pinahat (31.40 mbgl). In Akola (18.40 mbgl), Bichpuri (19.10 mbgl), Kheragadh (21.90 mbgl), Etmadpur (26.40 mbgl) and Barauli Ahir (27.80 mbgl) blocks, the status of groundwater levels are found to be moderate. Due to the increase in population, urbanization, cultivation of water-intensive crops like rice and sugarcane and over-exploitation of ground-water for irrigation purpose and household purposes results in the decline of groundwater levels
(Kaledhonkar et al., 2019 and
Singh and Ahmad 2011) in pre-monsoon season over the post-monsoon season from 2017-2020 years despite having the passage of Yamuna River basin over the Agra district.
Post monsoon season
The average rainfall that occurred in the Agra district in the year 2017 was 453mm (NASA Power Data accesses viewer 2023).
From Fig 11(a), the groundwater levels in the post-monsoon season of the year 2017 are shown to be very shallow in Fatehpur Sikri (6.64 mbgl), Achanera (7.95 mbgl), Jagner (7.45 mbgl), Kheragadh (8.13 mbgl) and Etmadpur (10.31 mbgl). while the groundwater is deeper in Shamshabad (23.67 mbgl), Fatehabad (25.17 mbgl), Barauli Ahir (22.42 mbgl) and Bichpuri (20.03 mbgl). In Akola (14.03 mbgl), Jaipur Kalan (12.82 mbgl), Pinahat (13.39 mbgl), Sainya (16.77 mbgl) and Bah (18.76 mbgl) blocks, the status of groundwater levels are found to be moderate.
The average rainfall that occurred in the Agra district in the year 2018 was 858 mm (NASA Power Data accesses viewer 2023). From Fig 11(b), the groundwater levels in post-monsoon season of the year 2018 are shown to be very shallow in Achanera (8.05 mbgl), Fatehpur Sikri (7.76 mbgl), Jagner (9.77 mbgl), Kheragadh (12.23 mbgl), Jaipur Kalan (19.60 mbgl) and Akola (15.68 mbgl). The groundwater levels are deeper in Barauli Ahir (30.09 mbgl), Fatehabad (27.26 mbgl) and Shamshabad (26.96 mbgl) blocks. In Etmadpur (20.08 mbgl), Khandauli (20.35 mbgl), Bichpuri (21.81 mbgl) and Sainya (21.06 mbgl) Bah (22.38 mbgl) and Pinahat (22.10 mbgl) blocks, status of groundwater levels is found to be moderate.
The average rainfall that occurred in the Agra district in the year 2019 was 697 mm (NASA Power Data accesses viewer 2023). From Fig 11(c), the groundwater levels in the post-monsoon season of the year 2019 are shown to be very shallow in Achanera (8.29 mbgl), Jagner (9.09 mbgl), Fatehpur Sikri (12.90 mbgl) and Bichpuri (14.64 mbgl) while the groundwater levels are deeper in Shamshabad (40.15 mbgl), Fatehabad (37.46 mbgl), Bah (32.07 mbgl), Sainya (35.61 mbgl) Khandauli (33.05 mbgl) and Jaipur Kalan (30.01 mbgl) blocks. In Akola (17.65 mbgl), Etmadpur (24.25 mbgl), Kheragadh (16.52 mbgl) Barauli Ahir (26.94 mbgl), Pinahat (27.70 mbgl) and Sainya (27.98 mbgl) blocks, status of groundwater levels is found to be moderate.
The average rainfall that occurred in the Agra district in the year 2020 was 507mm (Anonymous 2023). From Fig 11(d), the groundwater levels in the post-monsoon season of the year 2020 are shown to be very shallow in Achanera (8.46 mbgl), Jagner (10.90 mbgl), Fatehpur Sikri (14.26 mbgl) and Akola (18.27 mbgl) while the groundwater is deeper in Shamshabad (40.15 mbgl), Fatehabad (37.46 mbgl), Sainya (35.61 mbgl), Jaipur Kalan (33.35 mbgl), Khandauli (33.05 mbgl), Bah (32.07 mbgl) and Pinahat (31.29 mbgl). In Bichpuri (18.84 mbgl), Kheragadh (21.71 mbgl), Barauli Ahir (25.42 mbgl) and Etmadpur (26.73 mbgl) blocks, the status of groundwater levels is found to be moderate. Due to the adequate amount of rainfall and high recharge of surface water to groundwater in sandy soils in Agra district
(Sahoo et al., 2021 and
Kumar et al., 2017). There was a slight inclination in groundwater levels in post-monsoon seasons over the pre-monsoon season from 2017-2020 years.
Variation of groundwater level in blocks from 2017-2020
The groundwater variation with respect to different blocks of the selected location was shown in the Fig 12.
From Fig 12, the variation of groundwater levels was found to be shallow in Achanera (7.95 to 9.02 mbgl), Fatehpur Sikri (6.79 to 15.16 mbgl), Jagner (9.19 to 11.98 mbgl) Akola (14.69 to 18.27 mbgl) and Kheragadh (8.93 to 21.71 mbgl) Blocks. While the variation in groundwater levels was found to be deeper in Shamshabad (28.09 to 40.15 mbgl), Fatehabad (27.66 to 37.66 mbgl), Jaipur Kalan (14.70 to 33.35 mbgl), Sainya (16.77 to 35.91 mbgl) and Khandauli (20.35 to 33.13 mbgl). In, Bichpuri (18.83 to 21.97 mbgl), Etmadpur (10.31 to 26.73 mbgl) Pinahat (13.39 to 31.39 mbgl), Barauli Ahir (24.05 to 31.31 mbgl) and Bah (18.76 to 32.07 mbgl) blocks the variation in groundwater levels was found to be moderate in pre and post-monsoon seasons from years 2017–2020 with the effect of rainfall.
Statistical analysis results
The correlations between the pre-monsoon and post-monsoon groundwater levels were included in the Fig 13.
From the Fig 13, it is observed that all the considered years of groundwater levels were showing the positive correlation with the highest of 0.98 for the year of 2017, 2018 and 2020 followed by lowest of 0.87 in the year 2019. This is due to the extreme urbanization and the intensification of crop production techniques in the region of the Agra district has made the declination of groundwater in the year 2019. Later on, the groundwater levels were raised due to the unseasonal rainfalls in the parts of selected locations.