(a) The centennial parks conservation fund is a trust fund held outside the treasury by the trust company and administered by the department for the purpose of the creation and improvement of state parks.
(b) The trust company shall hold and invest the fund, taking into account the purposes for which the money in the fund may be used. The overall objective for the investment of the fund is to maintain sufficient liquidity to meet the needs of the fund.

(c) The expenses of managing the fund and its assets shall be paid from the fund. Except as otherwise provided by this chapter and § 49-e-1, Article III, Texas Constitution, money in the fund may not be used for any other purpose.
(d) In managing the assets of the fund, through procedures and subject to restrictions the trust company considers appropriate, the trust company may acquire, exchange, sell, supervise, manage, or retain any kind of investment that a prudent investor, exercising reasonable care, skill, and caution, would acquire or retain in light of the purposes, terms, distribution requirements, liquidity requirements, and other circumstances of the fund then prevailing, taking into consideration the investment of all the fund assets rather than a single investment. The fund may be invested with the state treasury pool and may be pooled with other state assets for purposes of investment.
(e) The department shall provide the trust company with a cash flow forecast at least annually, and more frequently as appropriate, to ensure the trust company is able to satisfy the objectives specified by Subsection (b).