IRRIGATION AND DRAINAGE Irrig. and Drain. 54: 217–230 (2005) Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/ird.168 SIMULATION OF CONTINUOUS AND SURGE FLOW IRRIGATION UNDER SHORT FIELD CONDITIONS y SALEH M. ISMAIL 1 AND HERMAN DEPEWEG 2 * 1 Soil and Water Department, Faculty of Agriculture, Assiut University, Assiut, Egypt 2 Department of Water Engineering, UNESCO-IHE Institute for Water Education, Delft, the Netherlands ABSTRACT This paper describes the simulation results for continuous and surge flow irrigation under short field conditions by the computer model SIRMOD III in order to evaluate the performance and applicability of the model for short furrows and to investigate the viability of the two-point method for calculating infiltration parameters under continuous and surge flow irrigation in short fields. These specific field conditions are found on farms smaller than 1 ha and with a furrow length of 70 m. To evaluate the model a series of experiments has been carried out in two locations in Egypt and in one site in the Netherlands. The experiments in Egypt were conducted on a field with clay soil situated at the Agriculture Experimental Station, Assiut University, and on a sandy soil field located at the Assiut University Experimental Station for Desert Land, El-Wadi El-Assuity, Assiut. The experiments in the Netherlands were carried out at the Tunnel Experimental Setting of the Irrigation and Water Engineering Group of Wageningen University. The tunnel was covered as a greenhouse to protect the investigations against the external weather conditions, especially rainfall. Two soil types were available inside the tunnel, namely sandy clay and sandy clay loam. All the experiments were carried out in furrows with a blocked end and their length and width were 70 and 0.70 m, respectively. Measured field data were used to evaluate the computer model SIRMOD III. The results of the evaluation indicated that the model can accurately simulate continuous and surge flow irrigation under short field conditions for the measured infiltration parameters. These field data are very important for a good simulation of the advance time and consequently the infiltration. The two-point method can be successfully used to obtain the infiltration parameters for continuous and surge flow irrigation under short field conditions and for different soil types. Copyright # 2005 John Wiley & Sons, Ltd. key words: SIRMOD; simulation; furrows; surge flow; short field conditions RE ´ SUME ´ Cet article pre ´sente les re ´sultats de simulation de l’irrigation en continu et par intermittence en situation de parcelles re ´duites par le programme SIRMOD III (Surface Irrigation Computer Simulation Model). Le but est d’e ´valuer les performances et l’applicabilite ´ du mode `le dans le cas des raies d’irrigation courtes, et d’e ´valuer la viabilite ´ de la me ´thode des deux points pour calculer les parame `tres d’infiltration en condition d’irrigation gravitaire en continu et en intermittence sur de petites parcelles. Ces conditions spe ´cifiques sont rencontre ´es dans des parcelles de moins d’un hectare et dont la longueur des raies est de 70 m comme c’est le cas en Egypte. Afin d’e ´valuer le mode `le, une se ´rie d’expe ´rimentations a e ´te ´ conduite dans deux sites en Egypte et dans un site aux Pays-Bas. Les sites en Egypte sont la station d’expe ´rimentation agricole de l’Universite ´ d’Asyut, avec un sol de type argileux, et la station expe ´rimentale des zones arides de l’Universite ´ El-Wadi El-Assuity, Asyut, avec un sol Received 3 March 2004 Copyright # 2005 John Wiley & Sons, Ltd. Accepted 10 February 2005 *Correspondence to: H. Depeweg, Department of Water Engineering, UNESCO-IHE Institute for Water Education, PO Box 3015, 2601DA Delft, The Netherlands. E-mail: h.depeweg@unesco-ihe.org y La simulation de l’irrigation en continu et par intermittence en situation de parcelles re ´duites.