People who put in holding systems or pipes or pumps should keep thinking about the need to conserve water. It seems like a good idea to put in a big tap and a big pipe so that when you turn it on lots of water comes out, but this can waste water. If there is no rain for a long time those hundreds of litres can be very hard to replace. Check cisterns, storage tanks and pipes for leaks during the rainy season, when it is easy to repair them and fill them up again. A leak during the dry season could be a disaster.
Storage tanks can lose water to the air if their tops are open.
It is best to have them covered. This will also help to keep them clean. No one wants to live all the time outside in the hot sun, the cool nights, the wind and the rain. We therefore build shelters, houses or buildings to protect us. These can be as simple as a few leaves on some sticks, or a tall concrete and steel building, but the purpose is the same.