Help! Water pouring out from unknown

2005Tacoma
I have a 2005 Tacoma 2.7 L engine 4 cylinder 5 speed. Recently, I started leaking all my water/coolant out when I turned off my truck. I replaced water pump but still leaking when I kill the truck. The leak seems to be coming from behind the water pump and beside the thermostat. It barely leaks when the engine is running but as soon as I kill it, water/coolant starts pouring out. Please help!
 
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