Be it for constructing an underground building or digging up a site to reveal the buried items, excavation is necessary and is practiced worldwide. To help you know more about the hydro excavation services , we have listed below some of the important points that you need to keep in mind. Hydro Excavation - An Overview Since you are planning to hire hydro excavation services, you should know about the technique first. Here, water is flown under high pressure in the form of a j