Akademik Veri Yönetim Sistemi
Applied Engineering in Agriculture, cilt.15, sa.5, ss.449-455, 1999 (Scopus)
DRAINMOD, an agricultural water management computer model, was used to evaluate the hydrology for an irrigation scenario for an Ohio community using treated wastewater as the water supply. This model was used to simulate the runoff potential of the proposed site under drainage and wastewater irrigation, to evaluate subsurface drainage system design parameters and irrigation interval, and to evaluate the effect of wastewater irrigation on potential crop yield. Constituent concentrations of the wastewater were within normal recommendations for agricultural irrigation, and were not the focus of the study. A 40-year climatic record and USDA Soils5 data were used as inputs to the model to evaluate hydrologic response over a range of input values of irrigation rate and interval, and drain spacing and depth. Simulation results indicate that an irrigation interval of 1 or 2 days could meet the annual irrigation application criteria of 67 cm (26 in.). Frequency analysis of runoff over the 40-year period for the 2-day irrigation interval revealed that approximately 99% of all days produced zero runoff. A response surface of average annual irrigation depth for the 2-day irrigation interval indicated that the target depth of 67 cm could be attained with a range of drain spacing (7.5 to 12.5 m; 25 to 50 ft) and depth (85 to 150 cm; 33 to 60 in.) combinations. Within the range of drain spacing and depths evaluated with wastewater irrigation at the 2-day irrigation interval, relative crop yield increased when an increase in drain depth was coupled with a decrease in drain spacing.