I noticed how no one ever published officially a script similar to the one of the rhino, but to turn the water cannon on the S.W.A.T van into a real cannon, so i made it for the lazy ones.
With this, your water turret becomes a 40mm grenades launcher, i'd suggest using it with the apc mod to make it more realistic. Anyway thanks to Ryosuke for his similar script from the rhino, that inspired me. Hope this will help you, enjoy and rate!