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Supplemental information for "Assessing the Impact of Pattiseema Lift Irrigation Project on Groundwater Resources in West Godavari District Using Visual MODFLOW"

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posted on 2025-06-05, 20:47 authored by Uday Bhanu Prakash Vaddevolu, Sasikala D, Vivek Sharma

  

Changes in groundwater recharge processes caused by regional changes in water use patterns need to be fully considered for the accurate budgeting and management of water resources. The West Godavari District (WGD) of India plays a significant role, benefiting from abundant water resources and bounded by the Godavari and Krishna rivers, the former discharges around 85,000 million cubic meters into the Bay of Bengal, while the latter has been susceptible to recurring droughts. To address this, the Pattiseema lift irrigation project was initiated, diverting surplus water from the Godavari to the Krishna River via unlined canals, significantly contributing to groundwater recharge. This study investigates the spatial and temporal variation of groundwater resources in the WGD and identify the potential groundwater zones. In addition, groundwater flow simulation was performed using the Visual MODFLOW under steady and transient state, to assess the impact of the Pattiseema lift irrigation project on these resources. To achieve this, the study region was divided into three regions i.e., low-land region, mid-land region and high-land region. Variation in groundwater levels was observed between pre-and post-monsoon periods, with groundwater levels rose to 35%, 39%, and 53% post-monsoon in low, mid, and high land regions, respectively. This variation is due to strong spatial pattern of annual precipitation across the study region. There was an approximate difference of 262 mm different average annual precipitation between northeast and southwest. This variation can have influence on the groundwater recharge and availability. The study area was categorized into low, medium, moderately high and high zones, with 740, 436, and 47 villages were located within the medium, moderately high to high and low groundwater potential zones (GWPZs), respectively. The Visual MODFLOW resulting in a satisfactory agreement between observed and measured water heads with R² of 0.89, MSE of 1.1 m, RMSE of 8.14 m, and NRMSE of 6.47%. Simulated model revealed the effect of the unlined canal on the groundwater table in the study area, showcasing a rise of approximately 3 meters in the study region. This observation signifies that the unlined canal has a positive impact, enhancing groundwater resources in proximity. This outcome emphasizes the critical importance of well-planned water management initiatives, emphasizing their role in sustaining and improving local hydrogeological conditions.

History

Manuscript Title

Assessing the Impact of Pattiseema Lift Irrigation Project on Groundwater Resources in West Godavari District Using Visual MODFLOW

Manuscript ID

NRES-16178

Email address

vsharma1@ufl.edu

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    Journal of Natural Resources and Agricultural Ecosystems

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