Long description

This is a graph of the discharge from the Lena River in Russia for the each month during 1935–1999. The horizontal axis is month of year from January to December. The vertical axis is monthly discharge from the river in cubic metres per second. The minimum is 0 cubic metres per second, the maximum is 120 000 cubic metres per second, and there are ticks every 20 000 cubic metres per second. In each month there is a series of 64 vertical bars representing the monthly discharge for each year in the period 1935–1999. From January to April there is almost no flow in the Lena and the bars are all less than 5000 cubic metres per second. In May approximately one quarter of the bars are greater than 5000 cubic metres per second, but the maximum discharge is still only around 30 000 cubic metres per second, and this only occurs in perhaps less than ten occasions in the record. In June there is a clear huge pulse in discharge and all of the bars are in the range 60 000–100 000 cubic metres per second. In July the discharge reduces to around 40 000 cubic metres per second, and in August and September it has reduced again to about 20 000 cubic metres per second. In October the discharge is typically about 10 000 cubic metres per second and finally in November and December the discharge is again less than 5000 cubic metres per second.