[[Image:Weighted drill bit.jpg|thumb|right|200px| 载重的钻头]]
Percussion drilling is suitable for unconsolidated and consolidated formations: Sand, silt, stiff clays, sandstone, laterite and gravel layers.冲击钻井适用于下列疏松或固结的构造：沙、淤泥、硬质黏土、砂岩、红土和砾石层。
Manual percussion drilling is generally used up to depths of 25 meters.人工冲击钻井通常适用于最深为25米的井。
Before drilling starts, it is good to analyse where the water might be. There are lots of clues to look for in WellSpringAfrica.org's [http://www.wellspringafrica.org/WebManual/chapter4.htm Selecting a Site.]钻井开始前，最好先分析水可能在何处。非洲泉源组织的网站（WellSpringAfrica.org）上提供了许多寻找水源时可用的线索。[http://www.wellspringafrica.org/WebManual/chapter4.htm 请选择网站。]
