Arpa

The Arpa is a 126-kilometer-long river that is a left tributary of the Aras River. The river begins in Armenia's Vayots Dzor Province and runs through the nation as well as Azerbaijan's enclave of Nakhichevan. The Arpa River also runs through a number of cities and towns, as well as the Spandaryan Reservoir.

During the spring flood, the absolute maximum flow occurs in the Arpa river's Jermuk section line. From 1957 to 2020, the absolute maximum flow values were observed during the spring flood in all years. They were found in 1.6 percent of cases along the Yeghegnadzor and Areni section lines. Maximum flow values increase downstream of the Arpa River, reaching high levels at the Areni outlet. There is a decrease in the main characteristics of the peak flood discharge from 1981 to 2020 when compared to 1957-1980. For the period 1957-1980, the series variation coefficient of absolute peak discharge values varies within a small range, from 0.46 to 0.40; the asymmetry coefficient varies within a relatively large range, from 1.05 to 1.72 for the Yeghegnadzor and Areni section lines of the Arpa River. The absolute peak discharge values for the flood period on the Arpa river in Yeghegnadzor and Areni section lines have been discovered to be correlated, which can be used to calculate and forecast peak flood run-off.

Length: 126 km