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Plain surveying means the survey in which earth surface is considered as to be flat or plain i.e. its curvature is ignored. Geodetic survey is the survey in which curvature of the earth is taken into count and then surveying is done.
chain surveying is one of the types of survey methods. It is used to survey short length lands
Volume computation is based on following:Pre dredge survey bathymetric data (reference)Post dredge survey bathymetric dataChannel design ( to calculate Cut and Fill)Once you have all the prerequisite data, you can use and hydrography processing software for comparing pro and post survey data to determine volume dredged or need to be dredged.
Ferhan ahamed
No, any Diploma not equivalent to BE. In any discipline, esp. in India, after attaining a diploma, you need to study for three years to get a BE.