How much water in the Colorado river reaches Mexico each yearHow does this changed over last 100 years and why?

On average, the Colorado River delivers about 1.5 million acre-feet (MAF) of water to Mexico each year. This is about 10% of the river's total flow.

The amount of water that reaches Mexico has changed over the past 100 years due to a combination of factors, including:

- Climate change: The Colorado River Basin has been experiencing a long-term drought. This has reduced the amount of water available in the river, and it has also made the river more susceptible to evaporation.

- Water consumption: The population of the Colorado River Basin has grown significantly over the past 100 years. This has increased the demand for water, and it has put pressure on the river's resources.

- Dams and reservoirs: The construction of dams and reservoirs on the Colorado River has changed the way the river flows. These structures have made the river more predictable and reliable, but they have also reduced the amount of water that reaches Mexico.

The changes in the Colorado River have had a significant impact on Mexico. The reduced water supply has made it difficult for Mexico to meet the needs of its growing population. It has also led to conflict between Mexico and the United States over water rights.