Time for a knowledge check! See how much you have learned and try out the water quantity and quality quiz. Did you learn enough about groundwater, surface water and rainwater measurement as well as water quality determination so far? You can return to the Quiz at any time, in case you are not feeling like an expert yet. All answers to the quiz questions can be found within the Toolbox element, so make sure to check out the rest of the material for more information! Good luck!