AGEN 352: Soil and Water Management Notes

Institution: Kisii University

Course: Bachelor of Agricultural Education and Extension

Content Category: Teaching Professional Documents

Posted By: grace mogiti

Document Type: DOCX

Number of Pages: 73

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Find notes on soil and water management. Study for your exams using this document and you'll pass it.

+Surveying
It is the art of determining the relative positions of different object on the surface of the earth by measuring the horizontal distance between them and by preparing a map to any suitable scale. Thus, in this process, the measurements are taken only in the horizontal plane.
Leveling:
Leveling is the art of determining the relative vertical distance of different points on the surface of earth. Hence, in leveling, the measurements are taken only in the vertical plane.
Types of Surveying [Classification]:
A. Primary Classification or Primary Division :
1. Plane surveying and 2. Geodetic surveying
1. Plane Surveying :
The shape of the earth is spherical. Thus the surface is obviously curved. But in plane surveying the curvature of earth is not taken into account. This is because plane surveying is carried out over a small area, so the surface of the earth is considered as a plane. The degree of accuracy required in this type of surveying is completely low. Plane surveying is done on an area of less than 250km2.
2. Geodetic surveying :
In geodetic surveying the curvature of the earth is taken into consideration. It is extended over a large area greater than 250km2. The line joining any two points considered as a curved line. Very refined methods and instruments are used in this type of surveying. IN this method very high precision or accuracy is required.
B. Secondary classification:
Survey can be classified on different bases.
1. Based on instrument:
A. Chain Survey B. Compass survey C. Plane Table survey D. Theodolite survey E. Tacheometric Survey F. Photographic survey
2. Based on methods:
A. Triangulation Survey B. Traverse Survey
3. Based on Objects:
A. Geological survey B. Mine survey C. Archeological Survey D. Military survey
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