In case the wire (set at a certain depth by a system of weights and buoys) encountered an obstruction, it will develop into taut and variety a "V," revealing the depth and place of submerged rocks and other obstructions. Hydrography is collected below principles which fluctuate depending on the acceptance https://alexisgfrcm.like-blogs.com/32286079/the-fact-about-hydrographic-survey-in-dhaka-that-no-one-is-suggesting