The board of each institution shall keep and preserve complete and accurate accounts of all sums of money received and disbursed to acquire, erect, lease, operate, or maintain any project and any other existing facilities, including a complete and accurate record of all revenues derived from any source set forth in subdivision C 1 a, b, c, or d of § 23.1-1106 and all sums disbursed for the payment of the principal of or interest on or other debt service with respect to any bonds issued pursuant to this chapter. The annual portion of such revenues that are not required to discharge any obligation, liability, or debt of the institution incurred in connection with the project or other existing facilities, including the creation of reserves for such purposes, shall be paid into the state treasury as provided in § 23.1-1109.