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Vol.54, No.1, PP.1-88
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1
A Preliminary Study on Rainfall Infiltration Leading to Rock Slope Failure and Pore Pressure Variation through Physical Models Simulated using 3DEC
54(1):1-15
Chih-Ying Yao Yu-Sen Lai Chia-Ming Lo*
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2
Rainfall Threshold and Signal Interpretation for Gravelly Debris Flows
54(1):16-26
Hsien-Ter Chou[1*] Yi-Syu Ciou[1] Chia-Min Hsu[1] Chih-Hsuan Huang[1] Ching-Jen Lin[2] Ben-Huan Guo[2]
* Corresponding Author. E-mail : htchou@cc.ncu.edu.tw
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3
Theoretical and Experimental Analyses of Flow Instability in High Gradient Channels
54(1):27-37
Hsun-Chuan Chan[1] Po-Wei Lin[1] * Tung-Yuan Hsieh[1] Yi-Ting Chung[2] Yi-Da Chien[2]
* Corresponding Author. E-mail : d107042002@mail.nchu.edu.tw
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4
Morphological Evolution Mechanism of Gravel-bed Braided River through Numerical Simulation of Da-jia River
54(1):48-59
Shih-Yen Hsu[1] Shaohua Marko Hsu[2]*
* Corresponding Author. E-mail : shhua@fcu.edu.tw
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5
Evaluation of the Technical Feasibility of the Soil and Water Conservation Practices in Weregen Watershed, Tarmaber District, Ethiopia
54(1):80-89
Kebede Bekele[1*] Tesfaye Mebrate[2]
* Corresponding Author. E-mail : kebedebekele19@gmail.com
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Evaluation of the Technical Feasibility of the Soil and Water Conservation Practices in Weregen Watershed, Tarmaber District, Ethiopia
Close
Kebede Bekele[1*] Tesfaye Mebrate[2]

Abstract
In most parts of Ethiopia, soil and water conservation practices were executed for long periods but its
sustainability is alarming mainly because of the lack of maintaining the technical recommended standards. This study
was conducted to evaluate the technical feasibility of the implemented soil and water conservation practices in the
Weregen watershed. Data were collected through field observation and measurements on stone-faced soil bunds, stone bunds, hillside terraces with a trench, bench terraces, and loose-stone check dams based on their commonness in the watershed. The current dimensions of the selected practices were evaluated against the recommended standards. The result indicated that the average deviations in the hillside terrace with trench were: riser height -29.9%, ,top width 52.8%, trench width 7.4% and trench depth -25%,; bench terrace: width 9.2%, vertical interval 17%, riser slope 29%,riser height -50%,; stone-faced soil bunds: top width -73%, height -70%, and spacing 65%; stone bunds: spacing 40%,height -15.4%, base width 33%, and top width 14.6%; and loose-stone check dams: spacing 27.3%, side key -46.6%,base width -47.1%, height -92.3%. In conclusion, the study indicates that all of the existing soil and water conservation practices were technically deficient. Field observation indicated that disparity of dimensions of the implemented practices and the standard was the main factor for deficient technical qualities. So it is better to focus on technical standards of soil and water conservation practices’ than only on its coverage to ensure the maximum and sustainable use of the practices.
Key words: Conservation practices, Deviation, Sustainability, Technical standards
〔1〕Debre Berhan Agricultural Research Centre, Debre Berhan, Ethiopia.
〔2〕Debre Berhan University, Debre Berhan, Ethiopia.
* Corresponding Author. E-mail : kebedebekele19@gmail.com
Received: 2022/04/19
Revised: 2022/06/06
Accepted: 2022/07/11
6
Soil Depth Estimation and the Influence of Soil Depth and Vegetation Cover on Slope Stability in the Liukuei Experimental Forest
54(1):60-69
Shiang-Yue Lu[1] Shao-Wei Wu[2] Ming-Yuan Sun[3]*
* Corresponding Author. E-mail : smy@tfri.gov.tw
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7
Vulnerability Assessment of Buildings and Residents for the Catastrophic Debris Flow in Nansalu Village during Typhoon Morakot
54(1):70-79
Hsien-Ter Chou1* Ting-Chi Tsao2 Chih-Hao Hsu2 Ching-Fang Lee2 Chien-Hao Huang1
* Corresponding Author. E-mail : htchou@cc.ncu.edu.tw
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8
Spatiotemporal Characteristics of Landslide Evolution in the Tsengwen Reservoir Watershed from the Assessment of Landslide Activity Through Spatiotemporal Hotspot Analysis
54(1):38-47
Yu-Ci Chen Chun-Hung Wu*
* Corresponding Author. E-mail : chhuwu@fcu.edu.tw
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