1/20/2024 0 Comments Sand dredging companiesQuantity or volume of sand available for dredging can be calculated from the results of borehole logs showing the various layers of deposits with given dimensions of length, breadth and depth.In conclusion therefore, a good sand search survey report must among other things provide information on the following: Pegs are usually placed on such points after investigations. Furthermore the co-ordinates of the center point of proposed underwater borrow pits must be known for accurate positioning of the dredger on the sand pit. Dredging companies need to know the distances for exploitation of the sand deposits as this will enable them ascertain the length of their floating hoses needed for that particular project. The map so produced is an essential tool for sand mining project.Īccurate positioning of the borehole points and measurement of the distance between such points and the stockpiling site on land while giving considerations for slack needed for the dredger to swing. The project area if very large is divided into blocks with accurate mapping of the project area using land survey methods or the more recent satellite mapping technique using the Global Positioning System (GPS). The results from the borehole logs, showing various depth interval of deposits with the X Y Z coordinates recorded, make it easy for the volume of sand to be calculated by simple geometry and arithmetic formula with given dimensions of length, breadth and depth. Local or manual methods include drilling borehole by water jet which is limited to shallow water depths. Local or Manual Sand search methods for shallow water depth. Boring for sample collection and determining the dimensions (length and breadth) of the intended borrow pit, the depth of water, volume of sand as well as the quality with sieve analysis (physical characteristics ) Geotechnical survey along the identified river channel in search of sand availability.In addition, topographic survey is employed to obtain the spot heights of areas on land that are above water level, while the drill borehole positions are selected. Hydrographic survey is also facilitated by carrying out a detailed survey of the water body and its adjoining man-made or natural features. Hydrographic surveying: This is the determination of the depth of the river/creek bed by a technique known as echo sounding.A systematic approach to sand search surveys involves:
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