Volume · Superchallenge problem

A swimming pool is $30$ m long and $12$ m wide, with straight walls. Its floor has two flat levels: the shallow part is $18$ m long and its floor is $1.3$ m below the edge of the pool; the deep part is the other $12$ m, and its floor is $2.8$ m below the edge. The pool is filled until the water is $30$ cm below the edge. How many cubic meters of water are in the pool?