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2012 (Vol. 4, Issue: 02)
Article Information:

A Review of Topography in Fish Culture in Nigria Part Three

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

Key words:  Fish pond building, horizontal angles, parallel lines, perpendiculars, right angles, survey,
Vol. 4 , (02): 105-118
Submitted Accepted Published
2011 May, 17 2011 June, 28 2012 February, 01
Abstract:

A review of topography in fish culture in Nigeria is aimed at enlightening fish culturist more topographical principles. The fish culturist can discuss his plans, projects and understand books on topography, engineering and surveying. Good fish farm construction can only be possible with the right topography. The fish culturists need to understand more principles in topography for good site selection in fish culture. The fish farmer can design and build fishponds, reservoirs and small dams and use existing topographical maps. Deciding the type of pond which could be built, Laying out fish ponds , Measuring horizontal angles, Graph meter, Measurement of angles with in accessible summit, Measurement of consecutive angles, Magnetic compass, Azimuth measurement of horizontal angle, Horizontal angle measurement with compass, Azimuth measurement of a line, Surveying a polygonal site, A protractor, The right angle method of measuring horizontal angles, Theodolite, Right angles and perpendiculars, Method of dropping a perpendicular, The full circle method, The half circle method, The Mid Point Method, The intersection method, Short line intersection method, Long line intersection method, The 3:4:5 rule method, Right angle measurement using the short 3:4:5 lines, Right angle measurement using the medium 3:4:5 lines, Right angle measurement using the long 3:4:5 Lines, Right angle measurement using tape, a cross staff and parallel Line are very important topography principles in pond fish culture, reviewed in this part to enlighten fish culturist more topography principle to facilitate fish farming.
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  Cite this Reference:
J.F.N. Abowei and P.A. Bariweni, 2012. A Review of Topography in Fish Culture in Nigria Part Three.  Research Journal of Environmental and Earth Sciences, 4(02): 105-118.
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ISSN (Online):  2041-0492
ISSN (Print):   2041-0484
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