Why would anyone put dirt in a water heater ?? Normally water heaters have sediment from the minerials in the water supply and the instructions furnished with the heater tells how to cure this problem
Side of water heater, near bottom.
It is probably sediment from the hot water heater, you may need to flush out the hot water heater tank, all it takes is a garden hose.
There are a couple of reasons why your hot water heater would groan. The valves may not be opened correctly. Or there could be a build up of dirt on the bottom of the tank. Clean out the sediment by letting the water run out until it is clear and this should help.
Convection
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The most likeliest answer to this question would be that your hot water heater is unfortunately rusting or perishing from the inside, no amount of cleaning will help. your only option is to replace the hot water heater.
The hot water valve should always be open, so the hot water can exit the heater into the system. If your actually meaning opening the drain valve on the bottom of theater, the water in the heater will drain, starting with the hot water stored there, and then the cold water that is entering the tank to replace it will simplt flow out the bottom before being heated. Dpending on where the heater is located will denepnd on how much of a mess the ensuing flood will be.
A hot water heater leaking from the bottom will typically need to be replaced as soon as possible to prevent further damage and potential safety hazards.
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The cold water supply enters the tank at the bottom near the burner. Heat rises, as does hot water. The hot water supply is piped out from the top.