As an American expert in water basins, my focus is on the Colorado River, which primarily affects the state of Arizona. The Colorado River is a crucial water source for the southwestern United States, particularly for Arizona, which relies heavily on its water for agriculture, industry, and domestic use. The river spans seven U.S. states and two Mexican states, but Arizona is particularly dependent on it due to its semi-arid climate and high population growth.

The Colorado River's importance to Arizona is underscored by the fact that the state receives approximately 40% of its water from the river. This reliance is further emphasized by the fact that the river's flow has been significantly reduced over the past century due to overuse and climate change. According to the U.S. Geological Survey, the Colorado River has seen a 20% decrease in flow since the 20th century, largely due to increased demand and changing precipitation patterns.

Arizona's water management strategies are a testament to the state's dependence on the Colorado River. The Central Arizona Project (CAP), a major water conveyance system, delivers water from the Colorado River to central and southern Arizona. The CAP has been instrumental in providing water to the state's growing population and agricultural sector. However, the project has also highlighted the challenges of managing a finite water resource in an arid region.

The Colorado River's water crisis is not just an Arizona issue; it is a regional and national concern. The river's basin spans multiple states, and its water is shared among various stakeholders, including tribes, farmers, and cities. The 2020 Drought Contingency Plan, an agreement among the seven Colorado River Basin states, aims to reduce water consumption and ensure the river's health. Arizona's participation in this plan underscores its commitment to sustainable water management and the importance of the Colorado River to the state's future.

In conclusion, as an expert in water basins, my focus is on the Colorado River, which is of paramount importance to the state of Arizona. The river's decreasing flow and the state's heavy reliance on it necessitate careful water management and conservation efforts to ensure sustainable water use in the face of growing demand and changing climate conditions.