Your search found 8 records
1 Pearce, G. R.. 1982. Zawia Reclamation Project III - Results of initial stages. Wallingford, UK: Hydraulics Research Station. 61p. (Hydraulics Research Station report no.OD/48)
(Location: IWMI-HQ Call no: 551.4609 G232 PEA Record No: H0368)
This interim report describes the difficulties that have arisen in reclaiming salt affected soil at Zawia in the northern periphery of the Nile Delta. Mainly these are natural ones: - a high water table, very saline groundwater, high evaporation rates, all of which combine to create the salinity problem; the consequent low permeability of the clay soil that makes it difficult to get leaching water to infiltrate; and the low-lying, flat nature of the land that makes it difficult to drain. Furthermore there are man made problems such as the difficulty in providing water in a controlled schedule, and the absence of chemical amendment. Described too are the results of Stages 1 and 2 of this project in which the local reclamation practice and then modifications to it were investigated. The broad conclusion of this is that these leaching operations were not successful because the field drainage was inadequate and hindered the flow through the soil profile of from the rather deficient supply in the canal network.
2 Pearce, G. R.. 1984. Zawia saline soil reclamation project, Egypt: IV filed drainage trials. Wallingford, UK: Hydraulics Research Station. 104p. (Hydraulics Research Station report no.OD/60)
(Location: IWMI-HQ Call no: 551.4609 G232 PEA Record No: H0253)
The reclamation of salt-affected lands in the northern Nile Delta has been less than successful. Previous reports in this series have reported earlier work to identify the cause of the failure and have described the present experiment aimed at finding a solution to the insufficient leaching by improving the drainage. This report describes the last stage of the project, the trials of 5 different field-drainage methods and comparison with the existing open-ditch system of drainage. The methods were Tile-pipe drains, Fabric- wrapped gravel-tube drains (FWGT-drains), Shallow ditches, Well-points and Mole-drains. Of these, Tile-pipe drains were found to be the most effective with the FWGT-drains performing almost as well. The existing method of open ditches was found to make no improvement at all to the salt distribution in the soil profile. The other major finding of this study was that even the most effective drainage method (viz. tiles) did not sufficiently improve potential gradients in the soil so that the required rate of leaching could be provided.
3 Pearce, G. R.. 1984. Water flow analysis on a smallholder irrigation scheme - Initial results, Nyanyadzi, Zimbabwe. In M. J. Blackie (Ed.), African Regional Symposium on Small Holder Irrigation, 5-7 September 1984 (pp. 353-378). London, UK: Hydraulics Research Ltd.
(Location: IWMI-HQ Call no: 631.7.3 G100 BLA Record No: H01592)
Basic data on the performance of a typical smallholder irrigation scheme is being provided by this project. The two aims are to provide a design database for the planners of future African smallholder irrigation schemes and to identify the lessons that can be learnt from one reasonably successful scheme. The initial results show that the Nyanyadzi scheme, among its many known problems, is suffering from the classic problem of the top-end farmers using more water than those at the tail-end. The results are tentative, the continuing drought in Africa having a masked effect on the process being measured. The need for replacing observer readings with an automatic gaugeboard and data logger system is discussed, and the improved performance of such a system is compared with conventional techniques.
4 Abernethy, C. L.; Pearce, G. R.. (Eds.) 1987. Research needs in third world irrigation: Proceedings of a colloquium at Hydraulics Research, Wallingford on 28-29 April 1987. Wallingford, UK: Hydraulics Research Ltd. 98 p.
Irrigation engineering ; Irrigation management ; Developing countries ; Research ; Agriculture ; Environment
(Location: IWMI-HQ Call no: 631.7.8 G000 ABE Record No: H03261)
5 Armstrong, A. S. B.; Pearce, G. R.; El-Quosy, D. E. D. 1991. Measuring the effects on Nile delta soil of irrigation with drainage water. In Woolridge, R. (Ed.) Techniques for environmentally sound water resources development: Papers presented to the African Regional Symposium held in Alexandria, Egypt, 17-19 February 1991. London, UK: Pentech Press. pp.34-49.
(Location: IWMI-HQ Call no: 333.91 G000 WOO Record No: H08243)
6 Pearce, G. R.. 1987. ODU Research colloquium report. ODU Bulletin, No.8(October):4-7.
(Location: IWMI-HQ Call no: P 2685 Record No: H012157)
(0.39 MB)
7 Bolton, P.; Pearce, G. R.. 1984. Report on African Regional Symposium on Small Holder Irrigation, University of Zimbabwe, 5-7 September 1984. Report, Hydraulics Research, Wallingford, UK. 23p.
(Location: IWMI-HQ Call no: P 4079 Record No: H014817)
8 Abbott, C. L.; El-Quosy, D. E. D. A.; Pearce, G. R.. 1996. A management tool for drainwater reuse. In ICID, 16th Congress on Irrigation and Drainage, Cairo, Egypt, 1996: Sustainability of Irrigated Agriculture - Transactions, Vol.1C, Q.47: R.2.04 Irrigation planning and management: Measures in harmony with the environment. New Delhi, India: ICID. pp.155-165.
Irrigation management ; Water quality ; Drainage ; Water reuse ; Assessment ; Decision support tools ; Soil properties ; Crop production ; Soil salinity
(Location: IWMI-HQ Call no: ICID 631.7 G000 ICI Record No: H019558)
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