The latest official statistics on precipitation and water resources present a complex, multi-layered picture of Iran’s current conditions. While national rainfall levels have increased significantly, this has not been sufficient to meaningfully ease the severity of water scarcity. More than anything, this underscores that Iran’s water challenges are not solely tied to rainfall volumes, but are deeply interconnected with structural, climatic, and managerial factors.
According to published data, total precipitation since the start of the current water year through late April has reached 219 millimeters. This marks a 64% increase compared to the same period last year, when approximately 133 millimeters were recorded, and places current levels slightly above the long-term average. At first glance, these figures may suggest an improvement in water resource conditions. However, a closer examination reveals a different reality.
The key issue lies in the highly uneven spatial and temporal distribution of rainfall. While some provinces—particularly in the south and west—have experienced precipitation levels more than double those of last year, several critical central provinces continue to face deficits. Regions such as Tehran, Qom, and Markazi, despite relative improvements compared to last year, still fall significantly short of their long-term averages.
For instance, Tehran province has recorded around 162 millimeters of rainfall, which remains nearly 30% below its historical average. This comes after last year ranked among the driest in recent decades for the province. As a result, even this year’s increased rainfall has not been sufficient to offset the accumulated shortfall from previous years.
A Dual Reality of Wet and Dry Conditions
One of the most defining features of the current situation is the emergence of a dual pattern in national precipitation. Climatic reports indicate that while the country’s overall areal average rainfall has returned to near-normal levels, roughly half of Iran continues to grapple with drought and low precipitation, while the other half is experiencing near-normal or even wetter-than-average conditions.
This imbalance carries significant implications for water resource management. In areas where rainfall has increased, infrastructure limitations in storage and water management have, in some cases, prevented full utilization of these gains. Conversely, in low-rainfall regions, demand for water remains high, intensifying pressure on already limited resources.
Changes in rainfall patterns further complicate the situation. A considerable portion of recent precipitation has occurred in the form of short, intense downpours. Such events increase surface runoff while reducing the opportunity for water to infiltrate underground aquifers. As a result, even heavy rainfall does not necessarily translate into sustainable gains in water reserves.
At the same time, rising temperatures and increased evaporation are diminishing the overall effectiveness of precipitation. As conditions grow warmer, a significant share of rainfall evaporates before it can be captured and stored for use. This dynamic is particularly pronounced in the country’s arid and semi-arid regions.
Dams Lag Behind Rainfall Gains
Alongside precipitation trends, the condition of the country’s dams continues to raise concerns. Although inflows to reservoirs have exceeded 30 billion cubic meters this year—an increase of around 60% compared to last year—this has not translated into improved storage levels across all regions.
Nationally, total water stored in reservoirs stands at approximately 32.5 billion cubic meters, reflecting an 18% increase from the previous year and placing it slightly above the ten-year average. However, this aggregate figure masks critical regional disparities.
In Tehran, for example, the five main dams supplying the capital are in one of their worst conditions in recent years. Their combined fill level is reported at just around 14%, the lowest level recorded at the start of spring since they became operational. Storage volumes in these reservoirs are down by more than 360 million cubic meters compared to long-term averages and have also declined significantly relative to last year.
Similar patterns are evident elsewhere. The Lar Dam holds only about 20 million cubic meters—roughly 2% of its capacity—placing it among the most critically affected. Its reserves have dropped sharply compared to long-term norms. The Saveh Dam in Markazi province is also in poor condition, with just around 8% capacity. In the east, the Doosti Dam in Razavi Khorasan has seen substantial declines as well, with only about 5% of its capacity filled.
At the same time, some dams in other regions, particularly in the northwest and south, are in more favorable condition and have reached relatively high fill levels. These disparities once again highlight the uneven distribution of water resources, further complicating management efforts.
Early Summer Intensifies Pressure
Compounding these challenges, climate forecasts point to an earlier-than-usual onset of warm weather this year. Rising temperatures are expected to significantly increase water demand across multiple sectors, particularly for drinking water and agriculture.
Under such conditions, existing water resources may struggle to meet growing demand, increasing the likelihood of water stress in certain regions. Past experience shows that without effective management, such stress can lead to consumption restrictions, reduced agricultural output, and even social tensions.
In areas heavily dependent on limited surface water sources such as dams, any decline in reservoir levels can quickly impact daily life. This is especially critical in major urban centers like Tehran, where managing consumption is becoming an urgent necessity.
Consumption Management: Missing Link
Taken together, the data make clear that Iran’s water crisis cannot be resolved through increased rainfall alone. Even in years with improved precipitation, factors such as uneven distribution, high evaporation rates, inadequate infrastructure, and inefficient consumption patterns can prevent meaningful recovery.
As such, water demand management emerges as one of the most critical pathways forward. Reducing non-essential use, improving efficiency in agriculture, adopting modern technologies, and reforming household consumption patterns are among the measures that can help alleviate pressure on water resources
At the same time, expanding storage and management infrastructure—such as increasing reservoir capacity, upgrading transmission networks, and reducing water loss—can enhance the effective use of available rainfall.
Overall, current conditions indicate that Iran is heading toward a challenging summer. While recent rainfall has offered a measure of hope, ongoing deficits in key regions and the precarious state of dam reserves underscore the urgent need for decisive action. Successfully navigating the months ahead will require a combination of smart management, careful planning, and public cooperation—without which even the wettest years cannot guarantee the country’s water security.
NOURNEWS