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APLIED SURVEY IN AQUACULTURE(PONDS)

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Height differences in fish culture ( Slope determination) In pond culture, you must often measure the difference in height between two points. To construct a pond, you need to determine the heights of the dikes you will build, and the depths of the pond bottoms you will dig. To choose the routes of water-supply canals from the source to the ponds, you will also need height and depth measurements. And when you plan a reservoir, you will also need to make height measurements to determine where its shoreline will be

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Types of problems you will be facing.There are three types of problems in the measurement of height differences. 1. You may have to measure any differences in height among a series of points on the ground, and compare them. From the results of this comparison, you can calculate the heights of given points so that you can make a map. This is called surveying the levels of the points, or levelingyou can make a mapleveling

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Calculating height differences

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2. You may have to locate points which are at the same height. This is called laying out contour lines, or contouring contouring Contour line

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3. You may have to locate points which have a given difference in height. In this case, you will be setting out lines of slope with a definite gradientyou will be setting out Setting out a slope

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A well planed commercial fish farm

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