A New Velocity Expression for Open Channel and its Application to Lyari River

In this communication an expression for mean velocity of waste flow via an open channel is proposed which is an improvement over Manning formula. The discharges, storages and depths are computed at all locations of the Lyari river by utilizing proposed expression. The results attained through proposed expression are in good agreement with the observed data and better than those acquired using Manning formula.

Authors:

• Rana Khalid Naeem
• Asif Mansoor

Keywords:

• Comparison
• Depth
• Flow
• Open Channel
• Proposed Model
• Storage

References:

[1] A. Chezy, "Formule pour trouver la vitesse de l-eau conduit dan une
rigole donnée," Dossier 847 (MS 1915) of the manuscript collection
of the ├ëcole Nationaldes Ponts et Chaussées, Paris. Reproduced in:
Mouret, G. (1921). Antoine Chézy: histoire d-une formule
d-hydraulique. Annales des Ponts et Chaussées 61, pp. 165-269,
1921.
[2] G. Lacey, "Stable channels in alluvium," in Proc. Institute of Civil
Engineers, London, 1929, pp.259-292.
[3] R. K. Sharma, and T.K Sharma, Irrigation and Drainage. New Dehli:
Khanna Publisher, 1990, pp. 157-186
[4] P. Diplas, "Characteristics of self formed straight channels,"
Hydraulic Engg. J., vol. 116. no. 5, pp. 271-311, 1990.
[5] S. V. Chitale, "Hydraulics of Stable Channels," Central Water and
Power Commission, Ministry of Irrigation and Power, India, 1966.
[6] C. Y. Ben, "Channel Flow Resistance: Centennials of Manning-s
formula," USA: Water Resources Publication, LLC, Highlands
Ranch Colorado, 80163-0026, pp. 157-159, 2004.
[7] H. E. Bazin, "├ëtuded-une nouvelle formule pour calculer le débit des
canaux découverts-Mémoire," Annales des ponts et chausses, vol.
14, no. 7, pp. 20-70, 1897.
[8] R. G. Kennedy, "The provision of silting in irrigation canals," in
Proc. No:2826, Proc. ICE, Vol. 119, London.
[9] V. T. Chow, Open Channel Hydraulics. New York: McGraw-Hill,
1959, pp. 580-680.
[10] M. C. Ponce, Engineering Hydrology Principles and Practices.
Prentice Hall: Englewood Cliff, N.J. 07632, pp. 233-315.
[11] H. E. Hudson Jr., and R. Hazen, "Droughts and Low Stream Flow,"
in Handbook of Applied Hydrology, Van Te Chow, Ed. New York:
MaGrow-Hill. 1964.