Eminent domain in Texas is often a matter of competing interests. Historic property rights come into conflict with growing populations, and lawmakers and courts must decide who has the superior claim. Much of Texas eminent domain law is therefore focused on resolving disputes between landowners and condemnors, ensuring that the condemnation process is fair and evenhandedly applied, and protecting the right of landowners to receive just compensation for their property.
The guides linked here will give you a basic overview of the eminent domain and condemnation processes in Texas. They're a great place to start if you don't know much about the issue.