California Code, Streets and Highways Code - SHC § 27242

Bonds may be issued in accordance with the estimate in such amounts not exceeding the total amount of bonds authorized as will produce a sum sufficient to pay the cost of constructing or acquiring or both the works for which they were authorized and interest on the bonds so issued during the period of construction and six months thereafter.  The failure to issue the full amount of bonds authorized shall not invalidate any bonds of the district.