A port district that acts as its own treasurer as provided in RCW 53.36.010 may by resolution adopt a policy for the payment of claims or other obligations of the port district, which are payable out of solvent funds, electing either to pay obligations by warrant or by check. However, no check shall be issued when the applicable fund is not solvent at the time payment is ordered, but a warrant shall be issued instead. When checks are to be used, the port commission shall designate the qualified public depository where checks are to be drawn, and the officers authorized or required to sign checks. Wherever in this title reference is made to warrants, the term includes checks where authorized by this section.