Final answer:
The new major reservoir in Texas is not specified in the provided information, but it reflects the need for significant water management solutions in rapidly growing regions.
Step-by-step explanation:
The student is asking about the new major reservoir in Texas, which is the first one built in the state in over 30 years. Unfortunately, the information provided does not specify the name or details of this new reservoir, but it highlights the challenges around water resources in the West, especially in areas like Nevada and California, where rapid population growth and climate change impacts have strained water supplies. The reference to a large reservoir with a surface area of 403 square miles and 22,500 MW capacity provided may illustrate the scale of infrastructure required to manage water resources in these growing areas, though it does not directly answer the question about Texas' new reservoir.