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This pond is specifically for my lotus and they need at least 30 in deep underground water for it not to freeze
My lotus are in a 2.5 feet deep stock tank, about 6-8 inches below water level in kitty litter. The lotus are growing in about 2 feet of litter. The tank is 1/2 in ground 1/2 out, that 1/2 is diagonal not height. The 1/2 is due to the slope of our yard, up slope is in ground, down slope is out of ground. Those lotus have survived some hard winters where the ice went down to the top of the litter and mild winters.
So in your zone 7b you don't need them that deep. Is the long and short of what I am typing