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2011 (Vol. 3, Issue: 6)
Article Information:

A Review of Topography in Fish Culture in Nigeria Part Four

P.A. Bariweni and J.F.N. Abowei
Corresponding Author:  Abowei Jasper 

Key words:  Conversion of slope units, layout of ponds, pond slope, slope calculation, slope measurement instruments, vertical angles and slope measurement,
Vol. 3 , (6): 662-672
Submitted Accepted Published
2011 May, 17 2011 June, 28 2011 November, 10

A review of topography in fish culture in Nigeria part four is aimed at providing more information to the fish culturist basic principles to design and build fishponds, reservoirs and small dams and use existing topographical maps. Whenever a line is not horizontal, it has a slope. The slope can be uphill or downhill. Its sloppiness depends on the difference in height between its points. The slope of the ground affects the measurement of distance. Ground slope is also very important is the design of fish farms, since it can reduce the construction cost. Build bottom slopes on canals to allow effective drainage. Build slope in the dykes for pond and dams . It is important the orientation vary according to the angle of slope so that there is a minimum amount of earthwork. It is always best to provide a means of diverting excess water. Ponds on a slope, Layout of ponds, Measurement of vertical angle and slope, Conversion of slope units in degrees or percentages, Measurement and calculation of slope, Clinometer, Clisimeter, Optical Clinometer and Plump line are aspects reviewed in this part.
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  Cite this Reference:
P.A. Bariweni and J.F.N. Abowei, 2011. A Review of Topography in Fish Culture in Nigeria Part Four.  Research Journal of Environmental and Earth Sciences, 3(6): 662-672.
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ISSN (Online):  2041-0492
ISSN (Print):   2041-0484
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