When the proceeding has been submitted, the commission shall make and file its written finding fixing, in a single sum, the just compensation to be paid by the political subdivision for the lands, property, and rights. If the commission finds that severance damages should be paid, the just compensation for such damages shall be found and stated separately. The just compensation shall be fixed by the commission as of the day on which the petition was filed with the commission.
Ca. Pub. Util. Code § 1411