PT  - JOURNAL ARTICLE
AU  - Keith R. Cooley
AU  - Leonard J. Lane
TI  - Modified runoff curve numbers for sugarcane and pineapple fields in Hawaii
DP  - 1982 Sep 01
TA  - Journal of Soil and Water Conservation
PG  - 295--298
VI  - 37
IP  - 5
4099  - http://www.jswconline.org/content/37/5/295.short
4100  - http://www.jswconline.org/content/37/5/295.full
AB  - Runoff curve numbers for sugarcane and pineapple fields in Hawaii were derived from rainfall and runoff data collected during a 7-year study between 1972 and 1979. The new curve number values were used to modify previously determined values based on 5 years of data and to adjust Soil Conservation Service handbook values. Handbook values were based mainly on experience obtained under mainland conditions and soils. The data-based curve numbers were slightly lower than previously used handbook values for sugarcane fields. The greatest differences were for porous A soils and complete cover conditions. The data-based curve numbers were considerably lower than handbook values for pineapple fields, where field roads occupied 11 to 20 percent of the area. The greatest differences were noted after pineapple had reached the partial or complete cover stage, indicating that pineapple provides more protection than expected once it covers at least 50 percent of the field surface. Observations suggest that major portions of the runoff comes from field roads, for which curve numbers are two to three times greater than those derived from the cropped area.