Estimating the Runoff Using the Simple Tank Model and Comparing it with the SCS-CN Model - A Case Study of the Dez River Basin

Authors: H. Alaleh, N. Hedayat, A. Alaleh, H. Ayazi, A. Ruhani

Abstract:

Run-offs are considered as important hydrological factors in feasibility studies of river engineering and irrigation-related projects under arid and semi-arid condition. Flood control is one of the crucial factor, the management of which while mitigates its destructive consequences, abstracts considerable volume of renewable water resources. The methodology applied here was based on Mizumura, which applied a mathematical model for simple tank to simulate the rainfall-run-off process in a particular water basin using the data from the observational hydrograph. The model was applied in the Dez River water basin adjacent to Greater Dezful region, Iran in order to simulate and estimate the floods. Results indicated that the calculated hydrographs using the simple tank method, SCS-CN model and the observation hydrographs had a close proximity. It was also found that on average the flood time and discharge peaks in the simple tank were closer to the observational data than the CN method. On the other hand, the calculated flood volume in the CN model was significantly closer to the observational data than the simple tank model.

Keywords: Simple tank, Dez River, run-off, lag time, excess rainfall.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075822

References:

[1] Alaleh.H.
[2010]. Comparative evaluation of Simple Tank Model in estimation of run-off with some hydrological methods in representation Dez catchment. M.Sc Dissertation, Islamic Azad University, Dezful, Iran.
[2] Alizadeh. A.
[P98]. Fundamentals of applied hydrology. I.R. University Press, Mashad, Iran.
[3] Zargaran. A.R.
[2008].comparative study of determining the surface run¬off and CN method , M.Sc Dissertation, Islamic Azad University, Dezful, Iran.
[4] Mousavi Nadoshani. S.
[1989]. Mathematical model using tank model, Proceedings of the First Hydrological Conference in Iran.
[5] Hedayat.N. (20)5), "Improving the performance of water delivery the Dez and Moghan Irrigation schemes in Iran". PHD Thesis canfield university . UK.
[6] Lee. Y.H. andSing. V.P . (1999). "Tank model using Kalman filter", Journal of Hydaulic eng, Vol.4, No. 4, ASCE, pp. 344-349.
[7] Mizumura.K. (1995), "Runoff-Prediction by simple tank model using recession curves", Journal of Hydraulic Eng., Vol.121, No.11, ASCE, pp.812-818.
[8] Mizumura. K. and C.L. Chiu(1985). "Prediction of combined snowmelt and rainfall-runoff', Journal of Hydraulic Eng. Vol.111, No.2, ASCE, PP.179-193.
[9] SCS. "National Engineering Handbook", Section 4, Hydrology, 1972.
[10]Sugawara. M. (1979), "Automatic calibration of the tank model", Hydrological Science-Bulletin-des Hydrologiques, pp. 375-388.