Volume Balance Method for Computing Infiltration Rates in Surface Irrigation

Abstract. Characterizing the infiltration and hydraulic resistance process is critical to the use of modeling tools for the hydraulic analysis of surface irrigation systems. Because those processes are still not well understood, various formulations are currently used to represent them. A software component has been developed for estimation of the parameters of infiltration and hydraulic resistance models. Infiltration computations rely on volume balance analysis. The software provides flexibility for defining the estimation problem with various data configurations. The procedure works with various infiltration and resistance formulations. Given the inherent inaccuracies of volume balance analysis, the software provides tools for identifying and correcting some of those inaccuracies. Computational tests are provided to illustrate the capabilities and limitations of the proposed procedures. Keywords: Basin irrigation, Border irrigation, Computer model, Computer software, Furrow irrigation, Model calibration, Surface irrigation, Water management, WinSRFR.

Download Full-text

Water vapor mass balance method for determining air infiltration rates in houses

10.2737/ne-rn-301 ◽

1980 ◽

Author(s):

David R. DeWalle ◽

Gordon M. Heisler

Keyword(s):

Water Vapor ◽

Mass Balance ◽

Balance Method ◽

Infiltration Rates ◽

Mass Balance Method ◽

Air Infiltration ◽

Vapor Mass

Download Full-text

Validation of Surge Model Using Furrow Gradient and Flow Retardance

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2019/v38i630469 ◽

2020 ◽

pp. 1-8

Author(s):

E. Sujitha ◽

A. Selvaperumal ◽

S. Senthilvel

Keyword(s):

Irrigation System ◽

Suitable Model ◽

Surface Irrigation ◽

Soil Infiltration ◽

Infiltration Rates ◽

Front Advance ◽

Surge Irrigation ◽

Time Periods ◽

Advance Time ◽

Water Front

Introduction: Surface irrigation, our oldest method of applying water on to the cropped land, has withstood the test of time because of its many advantages. Over the years, minor changes have been made to improve the efficiency of surface irrigation system. Aim: The present study was taken to validate the existing model with furrow gradient and flow retardance. Principle: The experimental layout has been made to accommodate the variance such as the furrow gradients (0.3%, 0.6% and 0.1%), the modes of irrigation namely the continuous flow as control and the surge flow as the treatment. Surge irrigation is a relatively new technique whereby water to surface irrigated furrows is applied intermittently in a series of relatively short ON and OFF time periods of irrigation cycles. Results: It is claimed that the ON-OFF cycling of the flow for specific time periods produces surges during the ON period and influences the soil intake during the OFF period when water soaks into the soil. The net result is a reduction in soil infiltration rates during subsequent surge ON periods and an increase in the rate of water front advance. The SURGEMODE model can only gives the net water front advance time that can be predicted for non-vegetated condition and a standard reference slope. However when the furrow is getting vegetated or when the slope gradients are changed, the water front advance predicted through the existing model cannot be predict accurately. Conclusion: Hence, the study involved to validate the existing model with furrow gradient and flow retardance. The use of revalidated existing SURGEMODE model with the correction factor would be the exact suitable model for the local condition.

Download Full-text