What are some of the techniques for protecting water supplies?
Protecting basin itself
If you want to protect water supplies, start from protecting your basin. A forested, ecologically balanced, and protected basin will guarantee you to have water. If you do not keep it clean and green, you will have to find alternative water supplies.
For groundwater, you should know your safe yield. Do not use more than allowed. Make sure that your well will not become dry sooner or later.
You have some irrigation or industrial/domestic uses. Minimize your water usage by reusing water, recycling water. Try the most efficient irrigation techniques. Support industry to adopt best available technique to save water.
Water is hardly replenishable source.