Emitter Discharge Research Articles

The effect of organic fertilize level, extract and drip discharge on the availability of nutrient and properties of Cucurbita pepo L

A field experiment was carried out in a clay soil in the district of Daquq, south of Kirkuk province, to study the effect of the level of organic fertilization and emitters discharge in some properties of the soil and the growth and holds pumpkin squash. The Organic fertilizers were added with four different amounts 0, 10, 15 and 20 ton per hectares, Organic Fertilization extract with two different levels 0, 20 gm per Liter, the irrigation was supplied by using drip Irrigation System. Water was supplied with two Discharge levels 3.93 and 7.86 Lh-1.Some of the chemical properties of soil such us of N, P, and K have been calculated. Number of foots and yield have been measured as a properties of the plant and the efficiency of water use have been calculated. The results showed an increase of the concentration of N, P, and K that available within the soil at 20 ton h-1 of fertilization level, which is 23.50, 108.70, and 203.7 respectively. The concentration of N, P, and K increase in the plant, which is 2.64, 0.39, 2.32% respectively. The 20 gm per liter has a significant of N, P, and K concentration in the soil with an average of 94.55, 19.80. 170.62 mg kg-1 respectively. Similarly, this concentration has an increase of N, P, and K concentration in the plant, which record 1.97, 0.41 and 2.11%. The result have showed that the best growth of the number of fruit and a total yield ,which is 8.87 fruit per plant and 25.11 ton h-1 respectively, at 20 ton h-1 fertilization level and 20 gm per liter extract concentration. In addition, at this result, combined with best water use efficiency that is 10.60 kg per meter

The influence of magnetized water on soil water dynamics under drip irrigation systems

Soil water dynamics under drip irrigation systems are of considerable importance in designing, managing and operating these systems. Emitter discharge, soil type, soil chemical properties, crop water-requirements, and quality of applied water are the main factors affecting soil water dynamics under drip irrigation. In this study, laboratory experiments were conducted to study the effect of magnetized water on wetting pattern dimensions and water content distributions under surface emitter. Passing water through permanent or electro magnets installed on feeding pipeline resulted in producing magnetized water. Two emitter discharges (3 and 4.5l/h, in average), two soil types (sand and clay), two soil profiles (homogeneous and layered-textural) and two water types (plain and magnetized water) were considered in the experiments. It was found that using magnetized water led to increase surface wetted radius by 6.2% and decrease vertical wetted depth by 6.3% in homogeneous soil profiles. In layered-textural soil profiles, the surface wetted radius slightly decreased by 1.8% while the vertical wetted depth increased by 7.0% in case of sand over clay and decreased by 2.0% in case of clay over sand when using magnetized water. As a result of using magnetized water, the total wetted area decreased for homogeneous profiles and increased for layered-textural profiles. It was concluded that the impact of magnetized water is statistically significant on wetted bulb dimensions and not statistically significant on water content distributions. The results revealed that using magnetized water is recommended especially in homogeneous soil profiles.

EVALUATION THE OPERATION OF A DRIP IRRIGATION SYSTEM IN DIFFERENT TYPES OF SOIL

Drip Irrigation Method is the best method that has been used in the world among the other irrigation methods because of its good and high uniformity. This method distributes water to the field using a pipe network and transforms it to the plant by emitters. In spite of the advantages of drip irrigation method, the system has many problems, such as the impact of soil type, silt and discharges distribution. To achieve the goals of using a drip irrigation system, it must be designed and operated properly so that rates and location of delivery of water to the root zone is suitable for crop requirements. Generally, the criterion for drip irrigation system operation is based on soil texture. Soil wetting is one of the most important parameters to determine the deep percolation rate and the efficiency of the system. Knowledge of soil wetting pattern and its movement plays a large role in deciding depth and spacing of pipes, design of irrigation scheduling and improving the efficiency of the drip irrigation system. The objective of this study is to develop an approach to operate the drip irrigation system in sandy and clay soils by a computerized method regarding the type of crops, its consumptive use, type of soil, frequency of irrigation and water distribution in the network .The study adopts two approaches as follows: The field work approach and the theoretical approach. In the field work approach, soil analysis of the physical and chemical properties of the soil which affect the soil quality as well as its suitability for growing plants are determined. For the theoretical approach the well known software CROPWAT is used for the calculation of crop water requirements and irrigation requirements depending on soil, climate and crop data. Measurements of the consumptive use, discharge, velocities, wetted soil width, wetted soil depth, frequency of irrigation for the two types of soil with silt content calculated. The designed discharge was found to be higher in clay soil than sand soil because it saves the water for a long time through a small area as it is little porous. Increasing silt rate for each type of soil, cause to increases the amount of irrigation water requirement. As the wetted soil width depends on emitter discharge and soil type, it will be increase with soils in high silty clay compared with the low silt and bigger as compared to sandy soils.

Wetting patterns estimation under drip irrigation systems using an enhanced empirical model

The wetting pattern is an important factor to consider when designing and managing a drip irrigation system. The dimensions of the pattern are imperative in selecting the right spacing between emitters and the suitable distance between laterals. We conduct laboratory experiments with surface drip irrigation involving two soil textures (sand and clay), two discharge rates, and two soil profiles (homogeneous and layered-textural). An empirical model was developed to estimate the vertical and horizontal advance of the wetting front at different application times. The empirical model includes estimation of the wetted radius at the soil surface and the depth of the wetting pattern as a function of application time, emitter discharge, soil bulk density, initial soil moisture content, saturated hydraulic conductivity, and the proportions of sand, silt and clay in the soil. We follow the same procedure in developing empirical formulas for predicting the wetted radius at different soil depths, to estimate the full shape of the wetting pattern. The proposed model predicts the full wetting pattern with acceptable accuracy and performs well in replicating published experimental data.

Adaptation of pressurized irrigation networks to new strategies of irrigation management: Energy implications of low discharge and pulsed irrigation

This paper analyzes the consequences of adopting new on-farm irrigation management strategies (low discharge rates, long irrigation times and high frequencies) in an existing on-demand and sectorized pressurized irrigation system in eastern Spain. The sectorized behavior of the network was analyzed using two criteria: (i) the operating sectors obtained in a first stage by arranging the hydrants depending on their altitude respecting the pumping station and (ii) the operating sectors obtained by means of an optimization process. The Simulated Annealing combinatorial metaheuristic optimization technique was employed to find the best solution. Random on-demand patterns were generated using a Montecarlo simulation. The hydraulic requirements of the network were analyzed in every scenario by the Epanet 2.0 engine. The effect on energy consumption, power requirements and energy costs was assessed taking into account the electricity tariff billing structure. It was found that reductions in emitter discharge (qe) and Energy consumption (E)-Energy Cost (EC) savings are not inherently related to each other. Certain amounts of E and EC could be saved when the number of sectors and operating time parameters were properly selected. Pulsed irrigation in the current scenario showed an energy saving potential of 10.67, 6.43 and 6.99% for power capacity, E and EC, respectively.

Irrigation Uniformity Impacts on Water Use Efficiency and Soil Salinity: Case Study of Tomato Crop under Trickle Irrigation System in the NorthEast of Tunisia

Water distribution uniformity remains one of the most used criteria for irrigation performance evaluation. In this paper, the effects of emitters’ discharges spatial-temporal variations on water supply and salt accumulation underneath trickle irrigated crop were assessed. The survey was performed in a private tomato plot in Kalaat El Andalous district (northern-east of Tunisia). Emitters’ discharges spatial variation measurements were made according to Keller and Karmeli method. These measurements were repeated four times throughout irrigation season. Recorded results show that outlets flow rates were significantly lower (-23% to -62%) than their nominal value (4 l/h) for all tested emitters. In fact, emitters’ discharges heterogeneity, recorded within four sites, were 3 l/h, 2.5 l/h, 2 l/h and 1.5 l/h. Nevertheless, for the same locus, emitter discharge variation ranged between -3% and +3% during the irrigation season. Consequently, applied water amounts were ranging between -48% to +6% of the needed water volume with an average uniformity coefficient of 71%. Because of such water supply spatial-temporal heterogeneity, salts leaching fractions were ranging between 8% and 69% of the total loaded salts amount whereas accumulated fractions were ranging between 21% and 90%.

Evaluation of Drip Irrigation Emitters Distributing Primary and Secondary Wastewater Effluents

Drip irrigation is a reliable and efficient way to deliver water to the soil; however, drip emitter clogging is a major concern when irrigating treated wastewater. Four types of drip irrigation emitters from three manufacturers were analyzed over a one-year period to monitor the incidence of clogging and its effect on irrigation uniformity. A controlled laboratory experiment was conducted using two different types of pressure compensating emitters designed for reclaimed wastewater, one type of non-pressure compensating emitter designed for reclaimed wastewater, and one type of non-pressure compensating agricultural emitter designed for potable water applications. Emitters of each type distributed tap water, primary treated septic tank effluent, and secondary treated sand filter effluent. Emitter flow rates were measured each month to identify clogged or flow restricted emitters. Some clogging was seen in each type of emitter over the course of the experiment and emitter flow rates fluctuated over time, suggesting that clogging was gradual and often incomplete. Many of the emitters exhibited a cyclical flow rate indicating that clogging was reversible. The emitters distributing septic tank effluent exhibited the most significant reduction in flow. The most severely clogged emitter experienced a reduction of 63% after one year of irrigation with septic tank effluent. Secondary treatment using the sand filter showed the least clogging in all four types of emitters. One of the reclaimed wastewater emitter types experienced an average reduction in flow of 1% while the other two actually increased in flow by1% and 4% after one year of irrigation with effluent from a sand filter. Water quality appeared to have a more pronounced effect than did emitter type. The effect of wastewater type on emitter discharge was +3.3% for tap water, -9.4% for septic tank effluent and -0.3% for effluent from secondary sand filtration. While the agricultural drip emitters experienced a significant negative impact after one year of operation the three drip emitters designed for distributing septic tank effluent and reclaimed wastewater showed little clogging and a high degree of uniformity.

Modelling Nutrient Leaching Below Crop Root Zone of Onion under Drip Fertigation

An experiment was conducted during the year 2008 and 2009 to study nutrient distribution (phosphorus, P; potassium, K and sulphur, S) under different fertigation strategies and to quantify the leaching of nutrients in onion crop. The study involved field experiment, laboratory analysis and modelling of P, K and S leaching and scenario generation for different types of soil and emitter discharge rates. Field data were used to calibrate and validate HYDRUS-2D model for solute transport. From the model performance parameters, HYDRUS-2D model was found to be good for predicting the P, K and S distribution in soil. The validated model was used for the simulations which were carried out on different soil types as well as with different fertigation and irrigation strategies. The results revealed that leaching of these nutrients was negligible in fine textured silty clay loam soil, whereas highest leaching occurred in coarse textured sandy loam soil. While considering discharge rate, more leaching was observed in case of emitter with higher discharge rate. Fertigation strategy also played an important role in leaching of P, K and S. Maximum leaching was observed in fertigation during first half of irrigation duration, whereas minimum leaching of P, K and S was observed with fertigation during second half of irrigation duration with two-day irrigation interval. It was concluded that 2.5 l.h-1 emitter discharge rate is suitable to reduce the leaching of nutrients, as well as minimize the free drainage of water with two-day irrigation interval in onion field.

Fitting a Numerical Model for the Analysis of the Wet Bulb Dimensions by Drip Irrigation

Prevision of the unsaturated zone hydrodynamics is one of the most important criteria for designing efficiently localized irrigation practices. In Uruguay the design of localized irrigation has been historically based on formulations and previsions to quantify the size of the wet bulb, using different methods (analytical and numerical simulations, empirical and field tests). These methods were based on soil conditions for light and homogeneous soils, and arid climatic conditions, which are difficult to extrapolate to local soils and crops. Nowadays, is known to be common practice over irrigation because of the lack of a more accurate prevision of the shape of the wet bulb. However, there is no knowledge about the amount of deep percolating water. This research is based on the comparison of experimental results obtained from field test under controlled drip irrigation of alfalfa with the results of a numerical model that simulates unsteady hydrodynamic processes in unsaturated zone. The used code was CODE_ BRIGHT, developed by the Department of Geotechnical Engineering UPC, Barcelona, Spain. Tests were carried out modifying both the time of water application as the emitter discharges. A 1.20 m diameter and 1.20 m tall cylindrical lysimeter was built reproducing the original soil profile of the area. Each stratum was assumed to be homogeneous and axial symmetry was used to find the most efficient way to locate measuring instrumental. Percolating water volume was also measured in the experiment, placing a drainage system at the bottom of the lysimeter. The test was set up on the INIA Las Brujas facilities, using soils of the area (silty loam and silty clay loam) typical of the center-south of the country. The comparison of measured and predicted results suggests the existence of complex phenomena more based in soil structure than in soil texture, which may explain the rapid percolation observed on the initial stages of irrigation. It is necessary to develop other numerical models that represent more accurately these behavior.

English

According to limited water in arid regions and its sharp drop per capita, we have to maximize water use efficiency under the best system for saving water (drip irrigation). To achieve this goal, two field experiments were carried out during growing seasons 2013 and 2014, it was executed in research farm of national research center (NRC) in Nubaryia province, Egypt, to study the effect of new engineering method for irregular volumetric distribution ratios of compost under reduction of emission uniformity on yield and water use efficiency of peanut crop. Study factors were irregular volumetric distribution ratios of compost on four zones along lateral were [D1= (25%, 25%, 25%, 25% compost), D2= (20%, 20%, 25%, 35% compost), D3= (15%, 15%, 30%, 40 compost) and D4= (10%, 10%, 35%, 45% compost)] under reduction of emission uniformity (EU) and emitter discharge along lateral, [EU1= 90%, EU2 = 80%, and EU3 = 70%].to study the effect of new engineering method for irregular volumetric distribution ratios of compost under reduction of emission uniformity on yield and water use efficiency of peanut crop. The following parameters were studied to evaluate the effect of study factors on: (1) Application efficiency along lateral. (2) Water stress along lateral (3) Yield of peanut, (4) Irrigation water use efficiency of Peanut IWUE Peanut.

Experimental and Numerical Analysis of Drip Tape Layout for Irrigation of Sugarcane in Latosol

A laboratory soil column experiment was first conducted to analyze water movement in latosol of sugarcane field under drip irrigation from single-point source at different emitter discharge rates. Next, a mathematical model of soil water movement under drip irrigation from single-point source was built using Hydrus-3D, which could accurately simulate the shape of the wetted soil volume and the distribution of volumetric water content in the experiment. Further, a Hydrus- 3D model of soil water movement under drip irrigation from double-point source was built and then used to analyze the effects of critical parameters on irrigation uniformity. Results showed that emitter spacing affected irrigation uniformity greatly, but emitter discharge rate did not. According to the irrigation uniformity, project cost and operational management patterns, appropriate drip tape parameters for irrigation of sugarcane in latosol were determined: emitter discharge rate 1.38 L/h, emitter spacing 30 cm, and single-emitter irrigation volume 9.0 L.

A MODIFIED EMPIRICAL MODEL FOR ESTIMATING THE WETTED ZONE DIMENSIONS UNDER DRIP IRRIGATION

Drip irrigation system has become one of the most common irrigation systems especially in arid and semi-arid regions due to its advantages in saving water. One of the most essential considerations in designing these systems is the dimensions of the wetted soil volume under emitters. These dimensions are significant in choosing the proper emitter spacing along the laterals and the suitable distance between laterals. In this study, a modified empirical equations for estimating the horizontal and vertical extend of the wetted zone under surface emitters were suggested. Data from published papers includes different conditions of soil properties and emitter discharge were used in deriving the empirical model using the nonlinear regression. The developed model has high value for coefficient of determination, R2. The results from the developed model were compared with results of other empirical models derived by other researchers. Some statistical criteria were used to evaluate the model performance which are the mean error ME, root mean square error RMSE, and model efficiency EF. The results revealed that the modified model showed good performance in predicting the wetted zone dimensions and it can be used in design and management of drip irrigation systems.

Development of a simplified model for predicting the optimum lengths of drip irrigation laterals with coextruded cylindrical in-line emitters

Accurate hydraulic design of laterals is one of the most important factors for ensuring water distribution uniformity in drip irrigation systems. In order to keep water distribution uniformity at an appropriate value, pressure and flow rate variations of emitters along a lateral should be within acceptable limits. This makes the determination of the optimum lateral lengths for drip irrigation systems necessary. The objective of this study was to develop a simplified empirical model able to predict the optimum lateral length to obtain uniform water distribution. The model developed is valid for a 16 mm nominal pipe diameter, with cylindrical co-extruded emitters and emitter spacing ranging from 0.2 m to 1 m. Optimum lateral length data was obtained from 26 different drip irrigation pipes. The model developed accounted for 98.3% of the variation in the optimum lateral lengths. The model was obtained by considering pipes with inside diameters ranging from 12.3 to 14.2 mm, emitter inside diameters ranging from 11.5 to 12.6 mm, emitter lengths ranging from 31.6 to 68.2 mm, emitter spacing ranging between 0.2 and 1.0 m, emitter discharges ranging from 1.75 to 4.30 l h −1 , and emitter flow variations from 10 % to 20 %, with gradients extending downhill or uphill

Solar powered micro-irrigation system for small holders of dryland agriculture in India

Small water harvesting ponds are crucial to sustain productivity by providing supplemental/life saving irrigation in the small holdings of Indian dryland agriculture. Applications of such water however, are always a major issue in these regions, since efficient and cost effective pumping system is generally not available. In order to achieve the holistic utilization of water resources, a gravity-fed type micro-irrigation system integrated with low cost solar based pumping system was designed. The system was designed considering the properties of flow characteristics derived from hydraulic study of different components of drip irrigation system. The system thus developed, has the capability to provide uniform emitter discharge over the small plot of 18m×6m. The star configuration of micro-tube layout where the lateral line feed four rows as devised by Bhatnagar and Srivastva (2003), was successfully integrated in the developed irrigation system. The field experimentation and testing suggested that the system performance was found satisfactory as the flow rate variation, Christiansen uniformity coefficient and distribution uniformity were 18.96%, 93.65% and 91.55% respectively.

Artificial neural networks for estimating the hydraulic performance of labyrinth-channel emitters

In this paper, we examine the discharge of labyrinth-channel emitters under different operating pressures (P) and water temperatures (T). An artificial neural network (ANN) and multiple linear regression (MLR) model are developed for the emitter flow variation (qvar) and the manufacturer’s coefficient of variation (CV). As well as P and T, the structural parameters of the labyrinth emitter are considered as independent variables. The ANN results demonstrate that a feed-forward back-propagation network with five input neurons and 14 neurons in the hidden layer successfully model qvar and CV. The trapezoidal unit spacing and path length of the labyrinth emitter are found to be insignificant. In our ANN model, we use a hyperbolic tangent as the activation function in the hidden layer and the output layer. Statistical criteria indicate that the ANN is better at predicting the hydraulic performance of the labyrinth emitters than MLR. The root mean square errors for qvar and CV are 1.0497 and 0.0044, respectively, for the ANN model, and 2.0703 and 0.0107, respectively, for the MLR model using a test dataset. The relatively low errors obtained by the ANN approach lead to high model predictability and are feasible for modeling the hydraulic performance of labyrinth emitters.

Noniterative Application of EPANET for Pressure Dependent Modelling Of Water Distribution Systems

EPANET 2 has been used previously to simulate pressure-deficient operating conditions in water distribution systems by: (a) executing the algorithm repetitively until convergence is achieved; (b) modifying the source code to cater for pressure-dependent outflows; or (c) incorporating artificial elements e.g., reservoirs in the data input file. This paper describes a modelling approach that enables operating conditions with insufficient pressure to be simulated in a single execution of EPANET 2 without modifying the source code. This is achieved by connecting a check valve, a flow control valve and an emitter to the demand nodes. Thus the modelling approach proposed enhances an earlier formulation by obviating the need for an artificial reservoir at the nodes with insufficient pressure. Consequently the connecting pipe for the artificial reservoir (for which additional data must be provided) is not required. Also, we removed a previous limitation in the modelling of pressure-dependent nodal flows to better reflect the performance of the nodes with insufficient flow and pressure. This yields improved estimates of the available nodal flow and is achieved by simulating pressure-deficient nodal flows with emitters. The emitter discharge equation enables the nodal head-flow relationship to be varied to reflect the characteristics of any network. The procedure lends itself to extended period simulation, especially when carried out with the EPANET toolkit. The merits of the methodology are illustrated on several networks from the literature one of which has 2465 pipes. The results suggest the procedure is robust, reliable and fast enough for regular use.

Field evaluation of the performance of different irrigation emitter types using treated wastewater

Experimental tests are carried out to evaluate the impact of treated wastewater (TWW) on the discharge of five different types of emitters which are commonly used. Two water qualities, fresh water (FW) and treated wastewater, and five types of emitters, GR, Nein (NE), Edin (ED), Corona (CO), and Rain Bird (RB) are tested. The values of chemical properties for FW show mostly low clogging potential on emitter performance. The clogging potential for TWW varied from low to medium. The exception was for pH where there was severe clogging potential for both water types. The performance of emitters was tested by measuring the emitter discharge and estimating the average emitter discharge (Qavg), coefficient of variation (CV), emission uniformity coefficient (EU), and Christiansen uniformity coefficient (CU). The average discharges for different types of emitters were analyzed and compared at P ≤ 0.05. The CO and RB emitter types did not show any signs of clogging whereas the GR, NE, and ED emitter types showed signs of clogging. The results of CV, EU, and CU values showed that the performances of emitter types GR, NE, ED were classified as low or moderate clogging potential. In contrast, the CO and RB emitters were classified as moderate or high clogging potential.

Reclaimed Water Filtration Efficiency and Drip Irrigation Emitter Performance with Different Combinations of Sand and Disc Filters

AbstractFilters are the most important components in micro‐irrigation systems, in particular for filtering high levels of suspended solids in reclaimed water. An experiment was conducted using reclaimed water to evaluate the removal efficiencies of sand filters with different uniformity coefficients (UCS) and in combination with sand filters with a 130 µm disc filter (120‐mesh). The treatment effects on emitter discharge were also investigated in this study. The results showed that the sand filters exhibited removal efficiencies of 11.4–48.0%, increasing to 30.7–80.3% when combined with the disc filter. The sand filter removal efficiency decreased with increase of the media diameter. A linear‐plateau relationship was observed between the removal efficiency and UCS. Compared to the control group, the combined filters reduced emitter clogging and significantly prevented a decrease in emitter discharge. It is suggested using the equivalent diameter, dt, to represent the filter medium diameter instead of using the effective diameter, de. The recommended value for the sand filter UCS > 2.0 for a mean total suspended solids (TSS) of 17.5 ± 12.7 mg l−1. Copyright © 2015 John Wiley & Sons, Ltd.

Simple Method for Determining the Emitter Discharge Rate in the Reclamation of Coastal Saline Soil Using Drip Irrigation

AbstractA laboratory experiment was carried out to study the relationships of emitter discharge rate (EDR) and distribution of water and salt for two typical coastal saline soils. The objective was to find a simple method to determine a suitable EDR for reclamation of coastal saline soil using drip irrigation. The experiment included five EDR treatments in a coastal saline sandy-loam soil (SAS): 0.23, 0.55, 0.8, 1.5, and 2.9 L·h−1; another five EDR treatments were conducted in a coastal saline silt soil (SIS): 0.23, 0.55, 1.0, 1.5, and 2.0 L·h−1. The water distribution and the low-salinity zone (with electrical conductivity of the saturated soil extract ≤1, ≤2, and ≤4 dS·m−1) were clearly affected by EDR. The relationships of EDR and wetted front, wetted zone volume, and low-salinity zone were difficult to obtain because of the requirements of determining and calculating the vertical wetted front and the volume of wetted, saturated, and low-salinity zones in the field. For this reason, these relationsh...

Fitting a Numerical Model for the Analysis of the Wet Bulb Dimensions by Drip Irrigation

Prevision of the unsaturated zone hydrodynamics is one of the most important criteria for designing efficiently localized irrigation practices. In Uruguay the design of localized irrigation has been historically based on formulations and previsions to quantify the size of the wet bulb, using different methods (analytical and numerical simulations, empirical and field tests). These methods were based on soil conditions for light and homogeneous soils, and arid climatic conditions, which are difficult to extrapolate to local soils and crops. Nowadays, is known to be common practice over irrigation because of the lack of a more accurate prevision of the shape of the wet bulb. However, there is no knowledge about the amount of deep percolating water. This research is based on the comparison of experimental results obtained from field test under controlled drip irrigation of alfalfa with the results of a numerical model that simulates unsteady hydrodynamic processes in unsaturated zone. The used code was CODE_ BRIGHT, developed by the Department of Geotechnical Engineering UPC, Barcelona, Spain. Tests were carried out modifying both the time of water application as the emitter discharges. A 1.20 m diameter and 1.20 m tall cylindrical lysimeter was built reproducing the original soil profile of the area. Each stratum was assumed to be homogeneous and axial symmetry was used to find the most efficient way to locate measuring instrumental. Percolating water volume was also measured in the experiment, placing a drainage system at the bottom of the lysimeter. The test was set up on the INIA Las Brujas facilities, using soils of the area (silty loam and silty clay loam) typical of the center-south of the country. The comparison of measured and predicted results suggests the existence of complex phenomena more based in soil structure than in soil texture, which may explain the rapid percolation observed on the initial stages of irrigation. It is necessary to develop other numerical models that represent more accurately these behavior.