Liability to pay interest.

Every person liable to pay the cost or part of the cost of any work under sub-section (1) of section 10 or to pay any contribution under sub-section (2) of that section or to pay expenses under sub-section (2) of section 15 shall be liable to pay interest on such cost, part of the cost contribution or expenses, as the case may be, at such rate and with effect from such date as may be prescribed.