M. Mohapatra, U.C. Mohanty, Some characteristics of very heavy rainfall over Orissa during summer monsoon season, J.Earth Syst, 114(1) (2005) 17-36.
 M. Doostkamian, S.H. Mirmousavi, The study and analysis the clusters of heavy rainfall threshold in Iarn, Geography and Development Iranian Journal 13(41) (2016) 131-146.
 M. Avarzamani, Numerical simulation of the performance of horizontal drains in increasing slope stability with Seep/w and Slope/w software, M.Sc. Thesis in hydraulic structures, Univer- sity of Tabriz, Iran, 2015. (In Persian)
 R.P. Martin, K.L. Siu, J. Premchitt, Performance of hori- zontal drains in Hong Kong, Special Project Report, SPR 11/94, Hong Kong, 1994.
 K.C. Lau, T.C. Kenney, Horizontal drains to stabilize clay slopes, Canadian Geotechnical 21(2) (1984) 241-249.
 A. Moharrami, Y. Hassanzadeh, F. Salmasi, G. Moradi, G. Moharrami, Performance of the horizontal drains in upstream shell of earth dams on the upstream slope stability during rap- id drawdown conditions, Arabian Journal of Geosciences, 7(5) (2014) 1957–1964.
 A. Malekpour, D. Farsadizadeh, A. Hosseinzadeh Dalir, J. Sadrkarimi, Laboratory investigation on the effect of horizontal drain length and thickness on steady seepage flow through homo- geneous earth dam, Water and Soil Science- University of Tabriz, 21(2) (2011) 51-63. (In Persian)
 A. Mahmoud, M. Badakhshan, A. Seifi, the effect on the leak- age flow along the horizontal drainage, power drifted and hy- draulic gradient in homogeneous earth dam by numerical simula- tion, Journal of Engineering and Construction Management 1(3) (2016) 20-23. (In Persian).
 H.R. Saba, M. Kamalian, I. Raeisizadeh, Gables slip thresh- old stability and optimal operation volume embankment navi- gation earth dam using combined neural network and genetic algorithms, Amirkabir Journal of Civil Engineering, (DOI): 10.22060/ceej.2017.11051.4965 (2017). (In Persian)
 S. Behrouzinia, H. Ahmadi, N. Abbasi, Dynamic properties of seepage and stability on upstream slope of an unsaturated ho- mogeneous earth dam subjected to rapid drawdown, Journal of Agricultural Engineering Research, 16(1) (2015) 19-36.
 Geo-Slope Version 7.1.0 User manual, Geo Slope Interna- tional, Calgary, 2012.
 H. Ghasemzadeh, Seepage in saturated and unsaturated soils, K.N. Toosi University, Tehran, 2009. (In Persian)
 F. Cai, K. Ugai, A. Wakai, Q. Li, Effects of horizontal drains on slope stability under rainfall by three-dimensional finite ele- ment analysis, Journal of Computers and Geotechniques, 23 (1998) 255-275.
 SPSS (Version 20), Statistical package for social science (SPSS) software version 20.