Irrigation Potential Evaluation and Crop Suitability Analysis Using Gis and Remote Sensing Technique in Beles Sub Basin, Beneshangul Gumez Region
No Thumbnail Available
Date
2007-03
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa Universty
Abstract
The study aims at evaluation of land use suitability for surface irrigation by using GIS.
The evaluation of land in terms of the suitability classes was based on the method as
described in FAO guideline for land evaluation. Multi-criteria decision evaluation
method was used to evaluate the physical land characteristics of the study area for surface
irrigation. There are techniques, which were used to weight and standardized the factors,
which are used to evaluate the land in the study area. These include pairwise combination
and weighted linear combination. The factors that were considered for evaluation of the
land for surface irrigation is slope, soil drainage, soil texture, soil depth, soil type and
land use. After evaluating the physical land capability for surface irrigation, irrigation
suitability map was developed. This map was classified in to five suitability classes based
on FAO guideline. The result that obtained are 41,650 ha (26.9%) very suitable, 24,100
ha (15.6%) suitable, 44,350 ha (28.7%) marginally suitable, 11,000ha (7.3%) marginally
not suitable and 33, 2500ha (21.5%) permanently not suitable. The land in the study area
was evaluated for suitability of crops. Temperature and rainfall amount of the study area
were the factors in addition to the factors mentioned above used for surface irrigation
evaluation. Maize and Cotton were selected to evaluate the land of the Beles sub Basin.
Suitability maps for both maize and cotton were developed. The suitability crops maps
were classified in to five suitability classes. Regarding maize 12,450ha (8.2%) very
suitable, 23,140ha (14.9%) suitable, 54,600ha (35.3%) marginally suitable, 16,200ha
(10.6%) marginally not suitable and 46,130ha (30.4%) permanently not suitable of the
total Beles Sub basin. Suitability classes for Cotton were16, 150ha (10.7%) very suitable,
22,540ha (15.1%) suitable, 49,020ha (32.6%) marginally, 17,200ha (11.5%) marginally
not suitable and 46,130ha (30.1%) permanently not suitable
Description
Keywords
Gis and Remote