Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia
Koga irrigation scheme was developed to irrigate about 7004 ha. Furrow irrigation is the recommended method for the distribution of water. However, furrow irrigation has inherent inefficiencies due to deep percolation on the upper end and runoff at the lower end of the furrow. These losses depend on...
| Main Authors: | , , |
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| Format: | Book Chapter |
| Language: | Inglés |
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International Livestock Research Institute
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/34236 |
| _version_ | 1855532404709523456 |
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| author | Desta, G. Getaneh, M. Tsigie, A. |
| author_browse | Desta, G. Getaneh, M. Tsigie, A. |
| author_facet | Desta, G. Getaneh, M. Tsigie, A. |
| author_sort | Desta, G. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Koga irrigation scheme was developed to irrigate about 7004 ha. Furrow irrigation is the recommended method for the distribution of water. However, furrow irrigation has inherent inefficiencies due to deep percolation on the upper end and runoff at the lower end of the furrow. These losses depend on furrow length, furrow gradient, surface roughness, stream size and cutoff time. These factors play significant role to influence the advance time of irrigation and the operation rule of the scheme. This paper examines the advance time of furrow irrigation at Koga. The experiment was conducted during 2012 irrigation season in two periods (February and April). The advance time of irrigation was monitored at three discharge rates and four furrow gradients at 90–110 m furrow length. The required discharge was measured using RBC flume. The average advance time at respective discharge rates of 0.3, 0.6 and 0.8 litre/sec range from 290–460 min, 150–437 min and 100–294 min during 1st irrigation; and 115–370 min, 78–189 min and 43–217 min during 2nd irrigation. The advance time vary greatly among the discharge rates when the furrow length increases. The advance time of water at 0.5, 1.0, 2.0 and 2.5 % gradients was 236, 181, 197 and 398 min at 1st irrigation and 163, 175, 220 and 88 min at 2nd irrigation respectively. Furrow gradients and surface irregularities result in great variation of advance time. The advance time becomes shorter when the field gets smoother during 2nd irrigation. Under non-levelled and irregular field conditions, 0.6–0.8 litre/sec application rate can be suggested to irrigate 30–40 m furrow lengths in order to improve application efficiency above 60% and to optimize the daily operation rule of the overall scheme. The result of this study indicates the relevance of examining the furrow length, discharge and application time recommended in the feasibility study of irrigation schemes. |
| format | Book Chapter |
| id | CGSpace34236 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | International Livestock Research Institute |
| publisherStr | International Livestock Research Institute |
| record_format | dspace |
| spelling | CGSpace342362023-09-25T07:43:13Z Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia Desta, G. Getaneh, M. Tsigie, A. water irrigation schemes Koga irrigation scheme was developed to irrigate about 7004 ha. Furrow irrigation is the recommended method for the distribution of water. However, furrow irrigation has inherent inefficiencies due to deep percolation on the upper end and runoff at the lower end of the furrow. These losses depend on furrow length, furrow gradient, surface roughness, stream size and cutoff time. These factors play significant role to influence the advance time of irrigation and the operation rule of the scheme. This paper examines the advance time of furrow irrigation at Koga. The experiment was conducted during 2012 irrigation season in two periods (February and April). The advance time of irrigation was monitored at three discharge rates and four furrow gradients at 90–110 m furrow length. The required discharge was measured using RBC flume. The average advance time at respective discharge rates of 0.3, 0.6 and 0.8 litre/sec range from 290–460 min, 150–437 min and 100–294 min during 1st irrigation; and 115–370 min, 78–189 min and 43–217 min during 2nd irrigation. The advance time vary greatly among the discharge rates when the furrow length increases. The advance time of water at 0.5, 1.0, 2.0 and 2.5 % gradients was 236, 181, 197 and 398 min at 1st irrigation and 163, 175, 220 and 88 min at 2nd irrigation respectively. Furrow gradients and surface irregularities result in great variation of advance time. The advance time becomes shorter when the field gets smoother during 2nd irrigation. Under non-levelled and irregular field conditions, 0.6–0.8 litre/sec application rate can be suggested to irrigate 30–40 m furrow lengths in order to improve application efficiency above 60% and to optimize the daily operation rule of the overall scheme. The result of this study indicates the relevance of examining the furrow length, discharge and application time recommended in the feasibility study of irrigation schemes. 2013-11-01 2013-12-14T14:44:20Z 2013-12-14T14:44:20Z Book Chapter https://hdl.handle.net/10568/34236 en https://hdl.handle.net/10568/33929 Open Access application/pdf International Livestock Research Institute Desta, G., Getaneh, M. and Tsigie, A. 2013. Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia. IN: Wolde, M. (ed). 2013, Rainwater management for resilient livelihoods in Ethiopia: Proceedings of the Nile Basin Development Challenge Science Meeting, Addis Ababa, 9–10 July 2013. NBDC Technical Report 5. Nairobi, Kenya: ILRI. |
| spellingShingle | water irrigation schemes Desta, G. Getaneh, M. Tsigie, A. Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia |
| title | Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia |
| title_full | Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia |
| title_fullStr | Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia |
| title_full_unstemmed | Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia |
| title_short | Examining advance time of furrow irrigation at Koga irrigation scheme in Ethiopia |
| title_sort | examining advance time of furrow irrigation at koga irrigation scheme in ethiopia |
| topic | water irrigation schemes |
| url | https://hdl.handle.net/10568/34236 |
| work_keys_str_mv | AT destag examiningadvancetimeoffurrowirrigationatkogairrigationschemeinethiopia AT getanehm examiningadvancetimeoffurrowirrigationatkogairrigationschemeinethiopia AT tsigiea examiningadvancetimeoffurrowirrigationatkogairrigationschemeinethiopia |