The board may make exceptions to this section or to the rules adopted pursuant to this section when it determines that the exceptions will be for the benefit of children affected.
For the purposes of this section, "service area" may be defined as any of the following:
The board shall prescribe by rule the method of computing the number of pupils which could be so housed for the purposes of this subdivision.
The board shall prescribe by rule the method for computing the number of adequately housed pupils for purposes of this subdivision.
Ca. Educ. Code § 16045