What is a confluence in biology

The United Mulde, mostly just called "Mulde", is created in Sermuth / Saxony by the confluence of the Zwickauer Mulde (167 km run length) and Freiberger Mulde (124 km run length). After 86 km of flow in Saxony, the United Mulde reaches the state border of Saxony-Anhalt northwest of Bad Düben. After a further 61 km of flow in Saxony-Anhalt, it flows into the Eibe between Dessau and Roßlau am Eibe-km 259.5. The Zwickauer and Freiberger Mulde drains an area of ​​around 5,345 km2 from the Eastern Ore Mountains to the Vogtland, in particular the northern slopes of the Ore Mountains, which are rich in precipitation (Figure 1). The catchment area of ​​the United Mulde in Saxony and Saxony-Anhalt, which is small in comparison with about 2000 km2, but in particular with little precipitation, has almost no influence on the essential characteristics of the United Mulde, such as water flow (runoff) and natural chemistry. The runoff (1961-1995) from the Bad Düben gauge of 63.7 m3 / s is almost the same as that of 75.2 m3 / s in Dessau. The Zwickauer Mulde is generally considered to be the source flow of the troughs, due to the greater length and water flow. Compared to the difference in altitude of 700 m between the source and its mouth (Dessau), the total length of the river, which is approx. 314 km, in connection with the geologically-related low water storage capacity of the catchment area, causes both persistent periods of low water and steep discharge peaks.