Water harvesting, the collection of rainfall and run off for future use, has been practiced for thousands of years; but in some regions where it was previously used it has been forgotten. In countries facing huge problems with land erosion due to runoff, governments have been encouraging the implementation of this technique. The implementation is important for more than prevention of water erosion. What other benefit might water harvesting have in these areas? A) to provide clean drinking water B) to provide water for overfarming C) to create lakes to encourage tourism D) to prevent a greater production of agricultural goods