(a) The district may designate as an agricultural project a project that relates to:
(1) the development of agriculture in the district and surrounding areas; and
(2) the preservation and conservation of the soil in the district for agricultural purposes.
(b) A project designated under Subsection (a) is for a public purpose.
(c) The cost of a project, including interest during construction and the cost of issuing obligations, may be paid from any source.
(d) The implementation of a project is a governmental function or service for purposes of Chapter 791, Government Code.