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.