In any ordinance adopted pursuant to this chapter to increase the amount of compensation which may be received by members of the governing board of a water district above the amount of one hundred dollars ($100) per day, the increase may not exceed an amount equal to 5 percent, for each calendar year following the operative date of the last adjustment, of the compensation which is received when the ordinance is adopted.

No ordinance adopted pursuant to this chapter shall authorize compensation for more than a total of 10 days in any calendar month.