The excavation or water alternative system is helpful for soils which can be far too loose to gather an intact Main or clod, or for soils made up of gravel. Equally the intact clod and excavation strategies are explained in detail by Cresswell and Hamilton (2002). An interactive map in https://garrettitdmx.educationalimpactblog.com/55070843/top-guidelines-of-soil-investigation-experts-bangladesh