By: Malik Bilal
Contributor: Engr Muhammad Rahmatullah Khan
Water is the lifeblood of Pakistan’s economy, food security and human wellbeing, yet the country’s water resources are under increasing pressure. Rapid population growth, climate variability, inefficient irrigation practices and limited storage capacity have combined to create a national concern that requires urgent attention. Water budgeting offers a practical and systematic way to understand how much water is available, where it is used and how much is lost across the system. By carefully examining inflows from rainfall, river flows, glacier melt and groundwater recharge and comparing them with outflows for agriculture, domestic and industrial use, environmental needs and evaporation, policymakers and local communities can identify deficits and adopt strategies for more sustainable water use.
Over the past several decades, Pakistan’s water situation has changed dramatically. In 1951, annual per-capita water availability was about 5,260 cubic meters, declining to roughly 1,200 cubic meters by 2000 and today it is near or below 1,000 cubic meters per person, placing the country firmly in the water-scarce category. Experts warn that without significant reforms, population growth and climate change will further reduce per-capita availability, intensifying social, economic and environmental risks. The country’s water system is dominated by the Indus River and its tributaries, forming the Indus Basin Irrigation System, one of the largest contiguous irrigation networks in the world. The basin receives approximately 135–145 million acre-feet of water annually from glacier melt, monsoon rainfall and winter precipitation, yet most of this water arrives during the summer months, leaving other seasons relatively dry.
Under the 1991 Water Apportionment Accord, managed by the Indus River System Authority (IRSA), water is distributed among provinces. Punjab receives about 55.94 MAF, Sindh 48.76 MAF, Khyber Pakhtunkhwa 8.78 MAF and Balochistan 3.87 MAF, with additional flows reserved for environmental and system requirements. Agriculture consumes roughly 90 percent of Pakistan’s freshwater but inefficiencies are significant. Studies show that 15–20 percent of water is lost in main canals, 10–15 percent in distributaries and up to 30 percent in watercourses due to seepage and structural issues. At the farm level, further losses from flood irrigation, evaporation and over-application mean that only about 35–40 percent of released canal water effectively reaches crops.
Groundwater has become an essential component of Pakistan’s water supply. The country extracts around 60–65 MAF of groundwater annually with Punjab accounting for nearly 80 percent through more than a million tube wells. In Sindh, a large proportion of groundwater is saline or brackish while fresh aquifers are concentrated along the Indus floodplain. Overall, Pakistan has an estimated 50–55 MAF of fresh groundwater and 15–20 MAF of saline or brackish water, much of which is unsuitable for agriculture. Groundwater depletion is severe in districts such as Lahore, Faisalabad, Multan, Quetta and Peshawar, with water tables declining by 0.5 to 1 meter per year in some areas.
Storage capacity further compounds the crisis. Major reservoirs, including Tarbela, Mangla and Chashma, provide only 13–14 MAF of storage, roughly equivalent to 30 days of water supply, far below global standards. Sedimentation has reduced capacity over time and large volumes of high-flow water are often lost to the Arabian Sea during floods. New projects such as Diamer-Bhasha, Mohmand and Dasu dams aim to increase storage and hydropower generation, yet infrastructure alone cannot solve the problem.
Climate change adds additional uncertainty to Pakistan’s water outlook. Rising temperatures accelerate glacier melt in the Himalayas and Karakoram ranges, while shifting monsoon patterns increase the frequency of floods and droughts. These changes make water supply less predictable and highlight the urgent need for adaptive management strategies.
Water budgeting offers a strategic framework to address these challenges. By systematically measuring water availability, provincial allocations, groundwater resources and system losses, policymakers can identify areas where demand exceeds supply and implement corrective actions. Punjab, the most irrigated province, relies heavily on both surface and groundwater, Sindh depends mainly on Indus River flows and faces challenges from saline aquifers, Khyber Pakhtunkhwa benefits from rainfall and mountain rivers but has uneven groundwater availability and Balochistan remains the most water-scarce province where extraction exceeds natural recharge in key districts.
Without effective reforms, water scarcity could reduce Pakistan’s GDP by up to six percent in the coming decades. Responsible water management, supported by reliable data, community participation and strong governance is essential for sustaining food production, protecting ecosystems and strengthening climate resilience. Achieving water security is not merely a technical necessity; it is a critical investment in Pakistan’s long-term economic growth and societal stability. The choices made today in managing water resources will determine whether future generations inherit scarcity or sustainability, making water budgeting both an essential tool and a vital responsibility.
About the Author: Malik Bilal is a development and humanitarian professional with over 16 years of experience in emergency response, resilience building, climate governance and sustainable development across Pakistan. He specializes in programme management, field implementation and community-based livelihoods and can be reached at malikbilal1983@gmail.com
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