《抛石手册》提供的指南始于项目中已决定在水力环境中建造结构物的阶段，该结构物以岩石作为唯一材料，或在岩石为多种材料组合之一时作为主要材料。
The Rock Manual provides guidance that starts from the stage in a project when it has been decided to construct a structure in a hydraulic environment using rock as the only material, or as the primary material where it is one of a combination of materials.