According to the mean annual discharge at the Datong hydrological station in the period from 1953 to 2002,the statistics showed steady-going characteristic comparatively to the variation of the time-series.

The nonuniform coefficient is defined as the ratio of mean square deviation of mean interval discharges in a year to mean annual discharge of the year and it is a standard statistics.

In 2005,the water quantity of upstream Yellow River was abundant,and the river discharge at damsite was more than mean annual discharge of 1 050 m~3/s. The actual discharge for pre-embankment of the banquette was 1 700 m~3/s,and the discharge at closure gap was 1 200~1 700 m~3/s that was merely next to the closure discharge of 2 000 m~3/s for Sanmenxia hydropower station on Yellow River.

Mean annual discharge was about two times greater for FR/JT/COLL springs than the FR/JT springs (6.47 vs.

With its total drainage basin of 37 107 km2 and mean annual discharge of 307 m3 s-1, the River Kymi is one of the largest in Finland.

We developed and tested a non-wadeable habitat index (NWHI) for rivers of Michigan, where non-wadeable rivers were defined as those of order ≥5, drainage area ≥1600 km2, mainstem lengths ≥100 km, and mean annual discharge ≥15 m3/s.

Mean annual discharge of the Mgeni river has reduced by 4% since dam construction and changes in discharge regime caused by the water release policy resulted in an increase in competent discharge events.

A positive correlation was found between the mean annual discharge of the Rhone river and the annual commercial landings of S.solea with a time lag of 5?years in the two fishing harbours (Sete and Martigues) located close to the Rhone delta.

According to the diversion level of irrigation.by goavity of Fengli canal in song Dynasty and on-the -spot invedigntion and Calculation and through the analysis of the present time hydrological daal, it is estimated that the average discharge of October and November arid the mean annual discharge of the Jing River in song Dynasty is about 320 m3/s, but, according to hydrological record that it has been reduced to 62 m3/s and 63. 6m3/s respeptively since 1920s. It shows that the runoff of the Jing River...

According to the diversion level of irrigation.by goavity of Fengli canal in song Dynasty and on-the -spot invedigntion and Calculation and through the analysis of the present time hydrological daal, it is estimated that the average discharge of October and November arid the mean annual discharge of the Jing River in song Dynasty is about 320 m3/s, but, according to hydrological record that it has been reduced to 62 m3/s and 63. 6m3/s respeptively since 1920s. It shows that the runoff of the Jing River is a remarkable tendency towards reduction along with the development of history. The background of forming such situation is warm and dry climate of middle latitude Zone in china.

By field survey it is decided that the source of Mekong River is the Zayaqu river whichstarts from the end of a small glacial on the Lasagongma Mountain in Zadou County，Qinghaiprovince. The altitude of the source is 5，167m and the location is 94°41＇35″E and 33°44＇13″N．Mekong River is the－7th biggest river in Asia and the 12th biggest river in world． Fromthe source to its first bigger tributary joint， Ganasongdou（94°36＇40″E and 33°12＇33″N），Za－yaqu river has a length of 93． 9km， an area of 2 560km~2 and a discharge...

By field survey it is decided that the source of Mekong River is the Zayaqu river whichstarts from the end of a small glacial on the Lasagongma Mountain in Zadou County，Qinghaiprovince. The altitude of the source is 5，167m and the location is 94°41＇35″E and 33°44＇13″N．Mekong River is the－7th biggest river in Asia and the 12th biggest river in world． Fromthe source to its first bigger tributary joint， Ganasongdou（94°36＇40″E and 33°12＇33″N），Za－yaqu river has a length of 93． 9km， an area of 2 560km~2 and a discharge of 54． 9m~3／s whichwas measured on Sept．4， 1994． From Ganasongdou to Changdou in Tibet Autonomous Re-gion，the river is called Zaqu River which has a length of 518km， Down from Changdou to theoutlet of the river inside China， the river is called Lancang jiang River，Lancang jiang Riverhas an area of 164， 766km~2，a length of 2 354km and a mean annual discharge of 2， 180m~3／s。 In the paper the physical geography and the natural resources in the source area were al-so discussed.

By field survey it is decided that the source of Mekong River is the Zayaqu river whichstarts from the end of a small glacial on the Lasagongma Mountain in Zadou County,Qinghaiprovince. The altitude of the source is 5,167m and the location is 94°41'35″E and 33°44'13″N.Mekong River is the-7th biggest river in Asia and the 12th biggest river in world. Fromthe source to its first bigger tributary joint, Ganasongdou(94°36'40″E and 33°12'33″N),Za-yaqu river has a length of 93. 9km, an area of 2 560km￣2 and a discharge...

By field survey it is decided that the source of Mekong River is the Zayaqu river whichstarts from the end of a small glacial on the Lasagongma Mountain in Zadou County,Qinghaiprovince. The altitude of the source is 5,167m and the location is 94°41'35″E and 33°44'13″N.Mekong River is the-7th biggest river in Asia and the 12th biggest river in world. Fromthe source to its first bigger tributary joint, Ganasongdou(94°36'40″E and 33°12'33″N),Za-yaqu river has a length of 93. 9km, an area of 2 560km￣2 and a discharge of 54. 9m￣3/s whichwas measured on Sept.4, 1994. From Ganasongdou to Changdou in Tibet Autonomous Re-gion,the river is called Zaqu River which has a length of 518km, Down from Changdou to theoutlet of the river inside China, the river is called Lancang jiang River,Lancang jiang Riverhas an area of 164, 766km￣2,a length of 2 354km and a mean annual discharge of 2, 180m￣3/s。 In the paper the physical geography and the natural resources in the source area were al-so discussed.