It’s liquid or water that always flows and so in a downward direction goes. Though never upward is also well known unless by evaporation or force it’s thrown. ______
This may not be entirely true as water can also stay in one place and become stagnant but initially it would've had to flow or fall into that place and then begins the slow process of evaporation. From 'The Quatrains' ongoing writings since the early 90's