Money is the bottom line for any government project.
The area around Onion Creek is currently undeveloped except for the new Austin Bergstrom International Airport. Typically, during the construction of a greenbelt, people are harmed by loss or destruction of property. However, the area in question is not being used to provide direct income for many people. Therefore converting the northern part of Onion Creek into a greenbelt would not adversely affect the community in that area. It can however increase the local community's quality of life by providing a place for them to relax, exercise, and enjoy nature.