Monitoring and Evaluating the Sedimentation Process in Mosul Dam Reservoir Using Trap Efficiency Approaches

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Reservoirs are usually exposed to sediment accumulation problems that will lead to reduction in their storage capacity. This problem directly affects the performance of the dams and causes shortage of their useful life. The simplest technique to estimate sediment deposition rate is using sediment rating curve with sediment trapping efficiency (TE) of the reservoir. Many empirical and semi-empirical approaches have been suggested for to determine this term depending on the annual inflow rate, reservoir characteristics and features of the catchments area. In this study six different empirical methods depending on the residence time principle (water retention time) were used. These approaches were reviewed and applied to determine TE of Mosul dam reservoir (MDR) for period 1986 to 2011. The monthly operating data for inflow, outflow and water elevations for MDR were used to determine monthly TE and long-term TE for whole period of MDR using the mentioned methods. Furthermore, the monthly inflow rate for River Tigris upstream MDR, its sediment rating curve and sediment feeding from valleys around MDR were used to estimate the amount sediment coming to the reservoir. The results provided by these methods for TE with sediment coming to MDR were used to compute the amount of sediment deposited in MDR on monthly bases during this period. The results obtained were evaluated using observed bathymetric survey data that had been collected in 2011 after 25 years of the operation of the dam. The results showed all the mentioned methods gave convergent results and they were very close to bathymetric survey results for estimating the volume of sediment deposited especially that proposed by Ward which gave 0.368% percentage error. Furthermore, the result computed using monthly TE gave good agreement if compared with that long-term TE where the percentage error was ranging between <span “=””>–3.229% to 1.674% for monthly adopted data and <span “=””>–4.862% to <span “=””>–2.477% for whole period data. It is believed that this work will help others to use this procedure on other reservoirs.

Cite this paper

E. Issa, I. , Al-Ansari, N. , Knutsson, S. and Sherwany, G. (2015) Monitoring and Evaluating the Sedimentation Process in Mosul Dam Reservoir Using Trap Efficiency Approaches. Engineering, 7, 190-202. doi: 10.4236/eng.2015.74015.


[1] Morris, G.L. and Fan, J. (1998) Reservoir Sedimentation Handbook, Design and Management of Dams, Reservoirs, and Watersheds for Sustainable Use. McGraw-Hill Book Co., New York, 805 p.
[2] Jain, S.K. and Singh, V.P. (2003) Water Resources Systems Planning and Management. Elsevier Science B.V.
[3] Garde, R.J. (2006) River Morphology. New Age International Ltd., New Delhi, 502 p.
[4] Yang, X.Q. (2003) Manual on Sediment Management and Measurement. World Meteorological Organization, Operational Hydrology Report No. 47, WMO-No. 948, Secretariat of the World Meteorological Organization, Geneva.
[5] Sumi, T., Okano, M. and Takata, Y. (2004) Reservoir Sedimentation Management with Bypass Tunnels in Japan. Proceedings of 9th International Symposium on River Sedimentation, Yichang, 1036-1043.
[6] Basson, G. (2008) Reservoir Sedimentation—An Overview of Global Sedimentation Rates and Predicted Sediment Deposition. Oral Contribution to the International CHR Workshop—Expert Consultation: Erosion, Transport and Deposition of Sediments, Berne, 28-30 April 2008, 74-79.
[7] Annandale, G.W. (2013) Quenching the Thirst: Sustainable Water Supply and Climate Change. Create Space Independent Publishing Platform, North Charleston, 250 p.
[8] Garde, R.J. and Raju, K.G. (1985) Mechanics of Sediment Transportation and Alluvial Stream Problems. 2nd Edition, Wiley Eastern Limited.
[9] Annandale, G.W. (1987) Reservoir Sedimentation. Elsevier Science Publisher B.V.
[10] Smith, S.E. (1990) A Revised Estimate of the Life Span for Lake Nasser. Environmental Geology and Water Sciences, 15, 123-129.


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