Optimized runoff curve numbers for sugarcane and pineapple fields in Hawaii

摘要: ABSTRACT: Runoff curve numbers for sugarcane and pineapple fields in Hawaii were derived from rainfall runoff data collected during a 7-year study between 1972 1979. The new number values used to modify previously determined based on 5 years of adjust Soil Conservation Service handbook values. Handbook mainly experience obtained under mainland conditions soils. data-based slightly lower than fields. greatest differences porous A soils complete cover conditions. considerably fields, where field roads occupied 11 20 percent the area. noted after had reached partial or stage, indicating that provides more protection expected once it covers at least 50 surface. Observations suggest major portions comes roads, which are two three times greater those cropped