THE SEPARATION OF MONTH RUNOFF
Baseflow separation has many methods, the traditional
methods have graphical method[6] and analysis
method[7].The casualness of graphical method is stronger,
the complexity of calculation, the precision is hard to
guarantee[8]; Analysis method depends on iterative curve
fitting algorithm, and many parameters, so it is difficult to
determine its error sources[9]. In recent years, most of
baseflow separation on international research is the
method of digital filter method. Six representative river
storage capacity of 600 million cubic metres,it is a
pluriennial regulation reservoir. Qingshitan reservoir is
fourth in Guangxi large reservoirs, which is the largest
reservoir in northern of Guilin. The reservoir watershed
appears a fan-shaped, narrow river way, steep slope,
mountain forest density, good vegetation, belonged to
mountainous rivers, the control catchment area of
474km2