For a systematic approach to quantify soil loss and runoff from agricultural fields, a standard device has to be evolved. The erosion plot equipment must be adequate to collect runoff and soil loss from the plot and to store all or a part for measurement and analysis. An experiment was conducted at the Cotton Research Station, Veppanthattai, Perambalur district of Tamil Nadu during the year 2012 to estimate the runoff and soil loss from the agricultural fields. A multislot divisor unit was designed to help in the scientific assessment of the runoff and soil loss the data would be useful for dry farming and soil conservation. Totally two runoff plots were installed. To study the crops impact with one plot kept fallow (control) and in another plot cotton crop was sown. From the fallow runoff plot the total runoff recorded was 1102.5 m3/ha whereas from the cotton grown runoff was 975.78 m3/ha and the soil loss under fallow plots was 13.19 tons/ha/year and in cotton grown runoff plot was 10.86 tons/ha/year. The result revealed that cotton crop on 0-2 per cent slope was effective in reducing the runoff and soil loss.