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Laboratory experiments were conducted to evaluate water seepage rate from ceramic materials under various environmental and hydraulic conditions. Seven ceramic pitchers (simulating large ceramic emitters) with various dimensions were used in the experiments. Results indicated that seepage rate is affected by various conditions including pan evaporation, soil suction pressure and hydraulic head. The value of hydraulic head seemed to have the largest effect on pitchers' seepage rate. The experiments revealed that ceramic pitchers can be used to supply water even under negative head thus eliminating the need for pressurized flow inside irrigation pipes.