Your search found 3 records
1 Pontin, J. M. A.; Wooldridge, R. 1978. A study of hafir linings in Darfur Province, Western Sudan. Wallingford, UK: Hydraulics Research Station. 58p. (Hydraulics Research Station report no.OD/10)
(Location: IWMI-HQ Call no: 631.7.1 G146 PON Record No: H0279)
2 Pontin, J. M. A.. 1978. Principles of canal seepage measurement by Bell-type bed penetration systems. Wallingford, UK: Hydraulics Research Station. 14p. (Hydraulics Research Station report no.OD/13)
(Location: IWMI-HQ Call no: 631.7.1 G000 PON Record No: H0686)
The principles and theory used in the design and operation of bell- type systems for the measurement of local canal bed seepage are explained and developed. The steady and non-steady state modes are treated separately with particular care to discuss the basic assumptions involved for each condition. The derivation of governing equations follows a parallel course to that originally introduced by Bouwer and is self-contained. Some comparison of the 2 points of view is presented accompanied by a discussion of weak points desiring research attention.
3 Pontin, J. M. A.; Abed, L.; Weller, J. A. 1979. Prediction of seepage loss from the enlarged Ismailia canal. Wallingford: Hydraulics Research Station. 81p. (Hydraulics Research Station report no.OD/28)
(Location: IWMI-HQ Call no: 631.7.6.2 G232 PON Record No: H02)
This report describes the results of theoretical analytical and field studies related to the problems of seepage and lining of the enlarged Ismailia Canal, Egypt. Direct measurements of seepage from the canal are reviewed and analyzed. Future seepage is estimated by using idealized models, that however ignore the possible existence of natural sealing by Nile silt. To investigate this hypothesis the HRS In Vibro-corer was operated on the canal - the first application in freshwater conditions. Corers were retrieved from the canal bed in an 8km reach with moderate success. The efficiency of the corer is evaluated in detail from the data obtained. The cores were prepared and analyzed at the Delta Barrage Laboratory. The results are described herein with their implications on the sealing phenomenon. Suggestions for extending the present studies using direct seepage measurements are explained in order to arrive at a logical decision whether to proceed with lining the canal. The work is part of a continuing research co-operation with the Hydraulics and Sediment research Institute, Arab Republic of Egypt.
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