43 U.S.C. § 494

Pecuniary penalty for nonpayment of operation charge

If any operation or maintenance charge is unpaid on the 1st day of the third calendar month after it became due a penalty of 1 per centum of the amount unpaid shall be added thereto, and thereafter an additional penalty of one-half of 1 per centum of the amount unpaid shall be added on the 1st day of each calendar month if such charge and penalties shall remain unpaid.

( Aug. 13, 1914, ch. 247, § 6 , 38 Stat. 688 ; Dec. 5, 1924, ch. 4, § 4 , subsec. H, 43 Stat. 703 .)