California Code, Public Resources Code - PRC § 5559

The board may adopt regulations, and it shall cause the regulations made by it to be posted upon park or other property of the district to which they apply, and it shall cause them to be published at least once in a newspaper published in the county or counties within which the district is in whole or in part situated, and such posting and publication shall be sufficient notice to all persons.

The affidavit of the general manager or the secretary that the district rules and regulations have been so posted and published is prima facie evidence thereof.  A copy of the rules and regulations, attested by any member of the board or by its secretary shall be prima facie evidence that the rules and regulations have been made by the board as provided by law.