It is simpler because you do 10+6 and 30+4
16 x 34 = 544
It depends on what the cost of water per thousand gallons is in your area and whether you have sewers. Usually the water bill is doubled when you have sewers. In my rural area, we don't have sewers, just city water at $3.95 per thousand. It cost us under $100 to fill a 16x34 inground pool.