What are the pros and cons of giving principals control over a school’s human resource allocation?

Bottom Falls School District is growing rapidly. In 2012, the district was composed of one high school, one middle school, and three elementary schools. Today, the district has two high schools, two middle schools, and six elementary schools. The superintendent and board of education have decided it is now time to hire a full-time human resources director.
After careful consideration, they have asked you to assume the position.
Your first step is to outline the duties and parameters of the department. The second step is to make recommendations regarding the implementation of a human resources software system.