Beyene, B. S., Van Loon, A. F., Van Lanen, H. A. J. and Torfs, P. J. J. F. (2014). “Investigation of variable threshold level approaches for hydrological drought identification.” Hydrol. Earth Syst. Sci. Discuss., Vol. 11, pp. 12765-12797.10.5194/hessd-11-12765-2014Beyene, B. S., Van Loon, A. F., Van Lanen, H. A. J. and Torfs, P. J. J. F. (2014). “Investigation of variable threshold level approaches for hydrological drought identification.” Hydrol. Earth Syst. Sci. Discuss., Vol. 11, pp. 12765-12797.

Frick, D. M., Bode, D. and Salsa, J. D. (1990). “Effect of drought on urban water supplies I: Drought analysis.” J. Hydraul. Eng., Vol. 116, No. 6, pp. 733-753.10.1061/(ASCE)0733-9429(1990)116:6(733)Frick, D. M., Bode, D. and Salsa, J. D. (1990). “Effect of drought on urban water supplies I: Drought analysis.” J. Hydraul. Eng., Vol. 116, No. 6, pp. 733-753.

Ganguli, P. and Reddy, M. J. (2012). “Risk assessment of droughts in Gujarat using bivariate copulas.” Water Resour. Manage., Vol. 26, pp. 3301-3327.10.1007/s11269-012-0073-6Ganguli, P. and Reddy, M. J. (2012). “Risk assessment of droughts in Gujarat using bivariate copulas.” Water Resour. Manage., Vol. 26, pp. 3301-3327.

Hisdal, H. and Tallaksen, L. M. (2003). “Estimation of regional meteorological and hydrological drought characteristics.” J. Hydrolo., Vol. 281, No. 3, pp. 230-247.10.1016/S0022-1694(03)00233-6Hisdal, H. and Tallaksen, L. M. (2003). “Estimation of regional meteorological and hydrological drought characteristics.” J. Hydrolo., Vol. 281, No. 3, pp. 230-247.

K-water (2015). Dams Operation Manual.K-water (2015). Dams Operation Manual.

Li, Y., Gu, W., Cui, W., Chang, Z. and Xu, Y. (2015). “Exploration of copula functions use in crop meteorological drought risk analysis: A case study of winter wheat in Beijing, China.” Nat. Hazards, Vol. 77, pp. 1289-1303.10.1007/s11069-015-1649-2Li, Y., Gu, W., Cui, W., Chang, Z. and Xu, Y. (2015). “Exploration of copula functions use in crop meteorological drought risk analysis: A case study of winter wheat in Beijing, China.” Nat. Hazards, Vol. 77, pp. 1289-1303.

Nelson, R. B. (1999). An Introduction to Copulas. Springer, New York.10.1007/978-1-4757-3076-0Nelson, R. B. (1999). An Introduction to Copulas. Springer, New York.

Shiau, J. T. (2003). “Return period of bivariate distributed hydrologic events.” Stoch. Env. Res. Risk A., Vol. 17, No. 1-2, pp. 42-57.10.1007/s00477-003-0125-9Shiau, J. T. (2003). “Return period of bivariate distributed hydrologic events.” Stoch. Env. Res. Risk A., Vol. 17, No. 1-2, pp. 42-57.

Shiau, J.-T., and Shen, H. W. (2001). “Recurrence analysis of hydrologic droughts of differing severity.” J. Water Resour. Plan. Manage., Vol. 127, No. 1, pp. 30-40.10.1061/(ASCE)0733-9496(2001)127:1(30)Shiau, J.-T., and Shen, H. W. (2001). “Recurrence analysis of hydrologic droughts of differing severity.” J. Water Resour. Plan. Manage., Vol. 127, No. 1, pp. 30-40.

Sung, J. H. and Chung, E. S. (2014). “Development of streamflow drought severity-duration-frequency curves using the threshold level method.” Hydrol. Earth Syst. Sci ., Vol. 18, pp. 3341-3351.10.5194/hess-18-3341-2014Sung, J. H. and Chung, E. S. (2014). “Development of streamflow drought severity-duration-frequency curves using the threshold level method.” Hydrol. Earth Syst. Sci ., Vol. 18, pp. 3341-3351.

Tallaksen, L. M. (2000). Streamflow drought frequency analysis , In: Drought and Drought Mitigation in Europe (ed. by J.V. Vogt and F. Somma), Kluwer Academic Publishers, the Netherlands, pp. 103-117.10.1007/978-94-015-9472-1_8Tallaksen, L. M. (2000). Streamflow drought frequency analysis , In: Drought and Drought Mitigation in Europe (ed. by J.V. Vogt and F. Somma), Kluwer Academic Publishers, the Netherlands, pp. 103-117.

Tallaksen, L. M., Madsen, H. and Clausen, B. (1997). “On the definition and modeling of streamflow drought duration and deficit volume.” Hydrol. Sci. J. , Vol. 42, No. 1, pp. 15-33.10.1080/02626669709492003Tallaksen, L. M., Madsen, H. and Clausen, B. (1997). “On the definition and modeling of streamflow drought duration and deficit volume.” Hydrol. Sci. J. , Vol. 42, No. 1, pp. 15-33.

van Huijgevoort, M. H. J., Hazenberg, P., van Lanen, H. A. J. and Uijlenhoet, R. (2012). “A generic method for hydrological drought identification across different climate regions.” Hydrol. Earth Syst. Sci ., Vol. 16, pp. 2437-2451.10.5194/hess-16-2437-2012van Huijgevoort, M. H. J., Hazenberg, P., van Lanen, H. A. J. and Uijlenhoet, R. (2012). “A generic method for hydrological drought identification across different climate regions.” Hydrol. Earth Syst. Sci ., Vol. 16, pp. 2437-2451.

Van Loon, A. F. and Van Lanen, A. J. (2012). “A process-based typology of hydrological drought.” Hydol. Earth Syst. Sci., Vol. 16, pp. 1915-1946.10.5194/hess-16-1915-2012Van Loon, A. F. and Van Lanen, A. J. (2012). “A process-based typology of hydrological drought.” Hydol. Earth Syst. Sci., Vol. 16, pp. 1915-1946.

Vogel, R. M. and Stedinger, J. R. (1987). “Generalized reservoir storage-reliability-yield relationships.” J. Hydrol ., Vol. 89, pp. 303-327.10.1016/0022-1694(87)90184-3Vogel, R. M. and Stedinger, J. R. (1987). “Generalized reservoir storage-reliability-yield relationships.” J. Hydrol ., Vol. 89, pp. 303-327.

Wu, H., Soh, L. K., Samal, A. and Chen, X. H. (2008). “Trend analysis of streamflow drought events in Nebraska.” Water Resour. Manage. , Vol. 22, pp. 145-164.10.1007/s11269-006-9148-6Wu, H., Soh, L. K., Samal, A. and Chen, X. H. (2008). “Trend analysis of streamflow drought events in Nebraska.” Water Resour. Manage. , Vol. 22, pp. 145-164.

Yoo, J., Kwon, H. H., Lee, J. H. and Kim, T. W. (2016a). “Influence of evapotranspiration of future drought risk using bivariate drought frequency curves.” KSCE J. Civ. Eng ., Vol. 20, No. 5, pp. 2059-2069 (in Korean).10.1007/s12205-015-0078-9Yoo, J., Kwon, H. H., Lee, J. H. and Kim, T. W. (2016a). “Influence of evapotranspiration of future drought risk using bivariate drought frequency curves.” KSCE J. Civ. Eng ., Vol. 20, No. 5, pp. 2059-2069 (in Korean).

Yoo, J. Y., Yu, J. S., Kwon, H. H. and Kim, T. W. (2016b). “Determination of drought events considering the possibility of relieving drought and estimation of design drought severity.” J. Korea Water Resour. Assoc. , Vol. 49, No. 4, pp. 275-282 (in Korean).10.3741/JKWRA.2016.49.4.275Yoo, J. Y., Yu, J. S., Kwon, H. H. and Kim, T. W. (2016b). “Determination of drought events considering the possibility of relieving drought and estimation of design drought severity.” J. Korea Water Resour. Assoc. , Vol. 49, No. 4, pp. 275-282 (in Korean).

Yu, J. S., Yoo, J. Y., Lee, J. H. and Kim, T. W. (2016). “Estimation of drought risk through the bivariate drought frequency analysis using copula functions.” J. Korea Water Resour. Assoc. , Vol. 49, No. 3, pp. 217-225 (in Korean).10.3741/jkwra.2016.49.3.217Yu, J. S., Yoo, J. Y., Lee, J. H. and Kim, T. W. (2016). “Estimation of drought risk through the bivariate drought frequency analysis using copula functions.” J. Korea Water Resour. Assoc. , Vol. 49, No. 3, pp. 217-225 (in Korean).

Zhang, L. and Singh, V. P. (2006). “Bivariate flood frequency analysis using the copula method.” J. Hydrol. Eng. , Vol. 11, pp. 150-164.10.1061/(ASCE)1084-0699(2006)11:2(150)Zhang, L. and Singh, V. P. (2006). “Bivariate flood frequency analysis using the copula method.” J. Hydrol. Eng. , Vol. 11, pp. 150-164.