3.2 Data Collection
Storm characteristics in the six plots, including storm depth and storm duration, were monitored by self-recording rain gauges. The rain gauges were located less than 500 m from each runoff plot for all of the watershed experimental sites. Surface runoff was collected at the downstream end of each plot by a funnel-type collector. Gravimetric soil water content in each plot was measured using the oven-drying method for disturbed soil samples collected at 10-cm increments from soil depths of 10 to 50 cm at 10:00 AM during the study period. The water content of the 0-15 cm soil layer profile could be obtained from the averaged soil water measurements at depths of 10 and 20 cm. These storm datasets have been compiled on a storm event basis and printed by the Shanxi Institute of Soil and Water Conservation and the Yellow River Administration Committee of the Ministry of Water Resources for internal use.
The original SCS-CN and proposed methods were calibrated and validated using data obtained from the three plots in the XDG watershed. The calibrated and validated proposed method was then applied to the remaining three plots in the CBG watershed.