The Reclamation Board shall not modify, amend or reject any plan on the ground that the plan provides for a levee which in its judgment is of excessive strength either in height, slopes or crown width, but no claim for compensation shall thereafter be made against the Reclamation Board or the Sacramento and San Joaquin Drainage District for any part of the levees which the Reclamation Board considers in excess of what is required to comply with its plans for flood control.