Years ago river water and rain water provided all the water people needed. The farmer working in the fields used river water. The people living in the towns used rain water. There was no shortage in the water supply. But population growth and town development have changed the situation. Nowadays geologists are looking for new underground reserves while engineers are trying to find cheap ways to get drinking water from the salty sea. Big advertisements printed in the paper ask people to save water. Farmers who have no irrigation system always fear a dry winter. Even those townsfolk who once disliked the winter rain now wait for the clouds that will bring rain.