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A Semiportable Multislot Divisor for Erosion and Runoff Measurements¹

ABSTRACT

When comparing the effects of cropping systems on runoff and erosion characteristics, it is important to collect samples representative of the treatment area while minimizing variance due to other factors. To meet these requirements a multislot divisor for runoff and sediment collection from small plots was constructed and its feasibility for use in field experiments assessed. The collection system was designed to handle a 20.3-cm, 24-h rainfall event resulting in a soil loss of 33.5 Mg/ha. The divisor ratio was found to be 0.1111 ± .0003 for flow rates ranging from 0.2 to 4.9 L/s. The sediment concentration ratio for nonsampled to sampled runoff was 0.9969 ± .05, and was close to unity for each particle size separate. The compact size of this equipment facilitates easy installation and removal of the device with minimum disturbance to the site.

¹ Contribution from the Dep. of Soil Science, North Carolina State Univ., Paper no. 10551 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC 27695-7601.

² Research Assistant, Dep. of Soil Science, North Carolina State Univ., Raleigh, NC 27695-7619.

Received for publication July 3, 1986.