water flows into a dam at a rate given by dv/dt = 30000 root (t+1)

Find the expression for the volume of water in the dam after t days assuming that the dam initially held 60000 m^3 of water

i tried integration of this equation

30000 root(t+1) + 60000

but i couldnt get the right answer which was 2000[2 + (t+1)^1.5]

any help greatly appreciated !