Irpin’ (Ukrainian: Ірпінь; Russian: Ирпень), often called Irpen’ as its name is pronounced in Russian, is a river in Ukraine, a right tributary of the Dnieper. This article is about the river. ... A drainage basin is the area within the drainage basin divide (yellow outline), and drains the surface runoff and river discharge (blue lines) of a contiguous area. ... The source of a river or stream may be a lake, a spring, or a collection of headwaters. ... In hydrology, the discharge of a river is the volume of water transported by it in a certain amount of time. ... This article is about the river. ...

It is 162 km in length and flows through the city of Irpin'. The location where Irpin' enters the Dnieper river falls into the Kiev Reservoir which the Dnieper forms because of the Kiev Hydro-Electric Power Plant dam. Thus, the Dnieper water level at this location is lifted artificially by about 6.5–7 meters above the natural level. Therefore, the water of Irpin' is pumped into the Kiev Reservoir by powerful electrical pumps, making Irpin' the river that literally flows upwards. Scrivener Dam, in Canberra, Australia, was engineered to withstand a once-in-5000-years flood event A dam is a barrier across flowing water that obstructs, directs or retards the flow, often creating a reservoir, lake or impoundment. ...

The lands around Irpen' were the heartland of Kievan Rus and the chronicles mention the river in connection with several important historic events, such as the Battle on the Irpen' River of 1321 in which the Grand Duke of Lithuania Gediminas (Gedemin) gained control over the lands of what is now central Ukraine. Kievan Rus′ (Ки́евская Ру́сь, Kievskaya Rus in Russian; Київська Русь, Kyivs’ka Rus’ in Ukrainian) was the early, mostly East Slavic¹ state dominated by the city of Kiev (ru: Ки́ев, Kiev; uk: Ки́їв, Kyiv), from about 880 to the middle of the 12th century. ... Generally a chronicle (Latin chronica) is historical account of facts and events in chronological order. ... The Battle on the Irpen River (as referred to in historic chronicles) occurred in 1321 between the armies of Gediminas (Gedimin), the Grand Duke of Lithuania, and knyaz (prince) Stanislav of Kiev, allied with knyaz Oleg of Pereyaslavl and knyaz Roman of Bryansk. ... Events Births September 29 - John of Artois, Count of Eu, French soldier (d. ... The presumable banner of the Grand Duchy of Lithuania with the coat of arms, called Пагоня in Belarusian, Vytis in Lithuanian and Pogoń in Polish Another version of the Lithuanian banner The Grand Duchy of Lithuania ( Lithuanian: Lietuvos Didžioji Kunigaikštystė, Belarusian: Вялі́кае Кня́ства Літо́ўскае (ВКЛ), Ukrainian: Велике Князівство Литовське (ВКЛ... Gediminas, duke of Lithuania - engraving of XVII ct. ...