Interest

Unless otherwise agreed to by the parties; every person who is entitled to recover damages certain, or capable of being made certain by calculation, under an arbitration award, and the right to recover which is vested in him, upon a particular day, is entitled also to recover interest thereon from that day, except during such time as the debtor is prevented by law, or by the act of the creditor, from paying the debt. Such interest shall be added to the arbitral award.