The Water Resources Commission may increase the reclamation lien against the land not now sold in the Tumalo Project as fixed in ORS § 555.340, if such increase is necessary or expedient in the completion of the project. The commission may reduce the amount due the state on account of the construction of the Tumalo Project by the amount expended by any such district or the federal government in completing the reclamation of the lands embraced within the project or any amount which may be expended in discharging the obligations of the state incurred under and pursuant to ORS § 555.320, 555.340 and 555.380, or otherwise.