Hi, I've completed an experiment in which I measured the height of the water in the tank with time. I plotted my results on graph paper as a graph of height against time, resulting in a curve of decreasing gradient, slightly resembling that of the e^(-kx) graph. 1) I am asked to symbolically suggest an expression for the speed at which the water level falls. 2) Additionally I am asked to use a simple technique to determine the average discharge velocity, u(t), and head of water h(t). Thanks.