Cal. Education Code § 41602

The governing board of a school district affected by fluctuations in enrollments and attendance levels to a degree which will, in all likelihood, result in an actual total of average daily attendance for the fiscal year in excess of that shown in the second period report for the second principal apportionment provided for in Section 41601, may, with the approval of the Superintendent of Public Instruction, submit, in lieu of such second period report, a report of the estimated total average daily attendance for the fiscal year. The report shall be in the form prescribed by the Superintendent of Public Instruction, and shall be utilized for purposes of the second principal apportionment. If the average daily attendance of a district for the period of time between July 1 and June 30 exceeds the estimated total average daily attendance reported under this section, the appropriate increases and decreases in the several categories of attendance for which separate foundation programs are required to be computed shall be brought forward to the corresponding categories of the second period report for the next succeeding fiscal year. In the event the estimated total average daily attendance reported under this section exceeds the actual average daily attendance for the fiscal year, the Superintendent of Public Instruction shall withhold, pursuant to Section 41341, from apportionments made during the succeeding fiscal year, the amount of the excess moneys which may have been apportioned as a result thereof.