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Rainfall Assessment and Water Harvesting Potential in an Urban area for Artificial Groundwater Recharge with Land Use and Land Cover Approach

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Abstract

Cities in arid and semiarid regions face the dual challenges of managing urban floods and water shortages, threatening their sustainability. Urban areas are particularly vulnerable to flooding despite minimal rainfall and are prone to drought. This is evident in the capital of Afghanistan, Kabul, where groundwater decline and urban floods pose severe challenges. This study investigates the possibility of utilizing rainwater harvesting (RWH) to manage urban floods and recharge groundwater. The research examines various aspects of rainfall patterns, such as variability, rainy days, seasonality, probability, and maximum daily precipitation. The analysis of precipitation statistics reveals that rainfall exceeding 30 mm occurs approximately every 3–4 years. Rainfall in Kabul follows a seasonal pattern, with a coefficient of variation of 127% in October and 46% in February during the wet period. The study then assesses the potential of RWH in Kabul City as a solution for stormwater management and groundwater recharge. Based on the typology of land use and land cover, implementing a rainwater harvesting and recharge system (RWHRS) could increase mean annual infiltration from 4.86 million cubic meters (MCM) to 11.33 MCM. A weighted Curve Number (CN) of 90.5% indicates impervious surfaces’ dominance. The study identifies a rainfall threshold of 5.3 mm for runoff generation. Two approaches for collecting rainwater for groundwater recharge are considered: RWHRS for a residential house with an area of 300m2, which yields approximately 88m3/year, and RWHRS for a street sidewalk to collect water from streets and sidewalks. These findings highlight the potential of RWHRS as an effective strategy for managing urban floods and recharging groundwater artificially.

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The data used in the current research will be available through the corresponding author based on request.

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Acknowledgements

The authors are grateful to the Department of Meteorology, General Directorate of Water Resources, Ministry of Energy, and Water of Afghanistan for providing precipitation data for the study.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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All authors contributed to the study’s conception and design. Material preparation, data collection, data analysis, and the first draft of the manuscript were performed by Ali Reza Noori. Prof. S.K. Singh reviewed the work, revised it critically for important intellectual content, and approved the version to be published.

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Correspondence to Ali Reza Noori.

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Noori, A.R., Singh, S. Rainfall Assessment and Water Harvesting Potential in an Urban area for Artificial Groundwater Recharge with Land Use and Land Cover Approach. Water Resour Manage 37, 5215–5234 (2023). https://doi.org/10.1007/s11269-023-03602-0

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  • DOI: https://doi.org/10.1007/s11269-023-03602-0

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