Abstract：Runoff plot is the major research facility and method in rainfall—runoff-soil erosion research. Traditional runoff plot is comprised of boundary walls, runoff gathering pit and collecting tanks,usually building with concrete. However, the traditional runoff plot has some disadvantages in its construction. It needs to dredge up the basis of boundary walls, which could result in the destruction or disturbance of nature slopes, and the original states is difficult to restore in short time. It affects the accuracy of observation and decreases the efficiency of research and observation. Meanwhile, it needs more time and higher construction cost. In addition, the traditional runoff plot is difficult to achieve specific needs for research or observation. The multi-outflow PVC material runoff plot uses PVC material to make boundary walls and runoff gathering pit instead of concrete. This new multi-outflow PVC material runoff plot has lower construction cost, and could reduce the disturbance on original slope in construction process, which could lead to the plot be used as soon as possible when it was accomplished. Changing the single outflow of traditional runoff plot to multi-outflow is another improvement of multi-outflow PVC material runoff plot. This improvement will increase the number of runoff outflows to eliminate convergence time of rainfall water which has significant effect on actual outflow time. Obviously, this method could improve the observation precision of runoff process.
2011, Vol. 9 
