Validation And Utilization Of The Soil Conservation Services (Scs) For Furrow Irrigation Design Method

The main objective of this work is to validate and utilize USDA-SCS furrow irrigation design method. Soil data were collected from 22 locations in Nile Delta to get the soil texture and infiltration functions. According to the collected data, the Egyptian soils were classified into three groups: clay, clay loam, and sandy loam. Linear regression analysis was used to determine the average infiltration constants for each group. It was found that the infiltration constant C= 7 for all families must be adjusted in order to use the USDA-SCS intake families for Egyptian soils, the constant 'C' in the infiltration equation is taken C =4 for clay soil, C =11 for clay loam soil, and C = 17 for sandy loam soil. The SCS method and volume balance equations were programmed in MATLAB computer language (EGY) to design and evaluate furrow irrigation. The program output was validated using field experiments data conducted at the Etay El-baroud ARC, Behera Governorate. According to results, SCS model and Volume Balance can be used for determining infiltration depths and advance times along furrow length for the three groups of the Egyptian soils. The field experiments and volume balance results are very close to each other. However, Experimental results are different from SCS model, but using a coefficient made close agreement. A sensitivity analysis was performed using the EGY model to study the effects of varying Manning coefficient, land slope, inflow rate cutoff time length of run, and soil type on the performance parameters.