Addressing the water storage gap

Water availability is key to life but is increasingly under stress. Worsening droughts globally, aging water infrastructure and rising imbalances between water supply and demand are resulting in significant pressures on populations, industrial activities, and the agricultural sector to sustain the population.

Key takeaways

  • Water storage is vital to protecting water availability against water scarcity
  • Over the last fifty years natural water storage globally decreased by around 27,000 billion m³ 1
  • Investments along the whole water-storage value chain can help to address water scarcity and associated hydropower challenges

To mitigate the impact of water stress, sustainable water supply and water storage solutions are needed that help enhancing water availability in water-scarce times.

The increasing water storage gap

Exhibit 1: Asian sovereign ratings on the rise

Source: World Bank: What the future has in store – A New Paradigm for Water Storage, February 2023.

Water storage, a critical cornerstone to water security

Water storage is rarely viewed as a critical sustainable water management technology in addressing waterstress related challenges. However, natural, hybrid and built water storages can significantly contribute to mitigate the effects of prolonged drought periods and hardly predictable precipitations by:

  • Meeting different and evolving needs from the population and industry in drier periods
  • Supporting Hydropower, which is the largest renewable energy source by capacity and generation
  • Reducing the environmental and social risks from floods
  • Ensuring waterway transport access through all seasons

Considering the benefits delivered by water storage to communities, businesses, and regions, it’s crucial to preserve and improve existing natural water storage (aquifers, lakes, wetlands) as well as to invest in the modernisation and development of built water storage systems.

Exhibit 1: Asian sovereign ratings on the rise

The Colorado River basin: a giant water storage in peril

Seven US states are highly dependent on the Colorado River, an already over-used waterway, and recently reached an agreement to cut consumption and help to save a stream that:

  • provides drinking water for more than 40 million people
  • is an irrigation resource for some of the country’s most important farmlands2
  • creates hydropower for eight surrounding states.
  • generates (approximately corresponding to the water needed to fill 6 million Olympic-sized swimming pools) around USD 60 billion per year in crops and livestock3

Under this agreement, the Inflation Reduction Act launched by the Biden Administration will compensate Colorado River Basin water districts, cities and indigenous communities with USD 1.2 billion for conserving 3 million acre-feet of water (corresponding approximately to the water necessary to fill 6 million Olympic-sized swimming pools) until 2026.4

Exhibit 1: Asian sovereign ratings on the rise

Overall, over USD 10 billion of Inflation Reduction Act funds are being directed at water, including drought relief, flood mitigation and climate resiliency of the domestic US water infrastructure. While USD 10 billion for water is great, especially in the context of more than 90 billion the U.S. government allocated for water through the Bipartisan Infrastructure Law (2021) and the Drinking Water and Wastewater Infrastructure Act (2021), it is important to get further evidence that water is finally getting the necessary attention it deserves.

Exhibit 1: Asian sovereign ratings on the rise

The recently accorded deal comes at the right time. The Colorado River basin has suffered a two-decades-long drought period5 while the drastically shrunken average snow runoff is accelerating the lowering of the river’s as well as of Lake Powell’s and Lake Mead’s – the two major reservoirs in the Colorado River basin – water levels.

Exhibit 1: Asian sovereign ratings on the rise

Water storage issues’ impact on hydropower

This alarming development has far-reaching consequences as the river system is not only supplying water to the surrounding communities but is also a key economic factor for the region accounting for USD 1.4 trillion of the annual U.S. economy and supporting 16 million jobs in several neighbouring states8. Additionally, a drying-out of the Colorado River basin would very probably also have a significant impact on electricity and water bills which could increase at the same rate as water levels fall. Once the reservoirs’ hydropower capacities decrease while electricity demand is growing uninterruptedly, the region will have to examine building infrastructure for alternative renewable power sources, like solar and wind.

It’s worth noting that currently the Hoover Dam at Lake Mead and the Glen Canyon Dam at Lake Powell supply hydropower for around 4 million residents in the seven basin states.9

Looking at the implications of decreasing stream flows and shrinking reservoir levels not only in the Colorado River basin, from an US-level perspective it’s also worth mentioning that the hydropower share of total U.S. renewable electricity generation is currently at 28.7% and at around 6.2% of total U.S. electricity generation.10

Under these circumstances it becomes even more urgent that additional financial flows are redirected to the restoration of existing and the further build out of new hydropower capacities.

Investing across the entire water storage value chain

Comprehensively addressing water storage issues means going beyond feasible quick wins like fixing leakages in water tanks, freeing water storage from sediment deposits, managing the transportation of water from reservoirs to people and businesses, and addressing the lifecycle of water storage – though these measures are, of course, indispensable for ensuring a sufficient water supply.

Looking at sustainable water management from a broader and systematic perspective implies the identification of innovators and enablers along the entire value chain. This ranges from technologies that help to understand, monitor and preserve aquifers, wetlands and other natural water storage where the majority of freshwater is stored, to companies that design built water storage tailored to specific climate, local or regional requirements. Indeed, minimising the environmental impact and maximising the efficiency and variability of reservoirs is vital.

Not least, integrated solutions to combine natural, hybrid and built storage capacities and harmonise their differing dynamics are needed to follow a holistic approach to sustainably manage and restore existing and build new water storage capabilities.

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