Capacity of second spillway of Boguchanskaya HPP A. P. Gouriev, N. V. Khanov, V. A. Fartukov, M. I. Zborovskaya and M. M. Abidov E3S Web of Conf., 401 (2023) 01010 Published online: 11 July 2023 DOI: 10.1051/e3sconf/202340101010