The child support schedule shall be applied:
a. in each county of the state;
b. in judicial and administrative proceedings under titles
13, 26 and 74 RCW;
c. in all proceedings in which child support is determined
or modified;
d. in setting temporary and permanent support;
e. in automatic modification provisions or decrees entered
pursuant to RCW 26.09.100; and
f. in addition to proceedings in which child support is
determined for minors, to adult children who are dependent
on their parents and for whom support is ordered pursuant
to RCW 26.09.100.
The provisions of RCW 26.19 for determining child support and reasons for deviation from the standard calculation shall be applied in the same manner by the court, presiding officers and reviewing officers.