Infiltration is the process by which water enters the earth’s surface. Although contribution of soil water to total water present on earth surface is negligible, but it is of prime importance for plant life. Very recently, dimensionless form of Kostiakov equation was proposed for precise estimation of Kostiakov model parameters. The present paper is an assessment of accuracy of proposed dimensi...

This report consisted of studying the effects caused by soil physical characteristic, in presence wetness variations and structures-texture fluctuations, to Kostiakov constants. The objectives were investigate wetness, depth, compaction on constants “a”, “b”. experimental unit nine polyvinyl cylinders. Statistical analysis under a randomized block design with three replications factors: five le...

infiltration is a complex process that changed by initial moisture and water head on the soil surface. the main objective of this study was to estimate the coefficients of infiltration equations, kostiakov-lewis, philip and horton, and evaluate the sensitivity of these equations and their coefficients under various initial conditions (initial moisture soil) and boundary (water head on soil surf...

Understanding phosphorus (P) transport from agricultural land is essential to the development of effective management strategies that reduce the impact of agriculture on inland water quality. This paper describes the development and application of a process based model describing P transfer down a farm scale irrigation drain. The model uses a volume routing equation combined with the Kostiakov ...

Vertisol soils, which cover large lands in irrigated areas Turkey and the world, swell when wet form deep cracks dry. These properties of soils cause a significant decrease irrigation efficiency irrigating with surface methods, thus causing water insufficiency drainage problems. If appropriate time, flow rate furrow-border lengths are used, application can be increased these soils. For this pur...

Infiltration plays an essential role in increasing the soil water content as a part of hydrological cycle. affects surface runoff and conservation. It also determines sustainability groundwater system. Heavy rain intensity exceeding infiltration capacity will result runoff, excessive cause erosion. This study aims to investigate suitable rate model Mediterranean clay textured with various condi...

The movement of water into the soil under specific conditions is called infiltration. The study of infiltration is one of the most important necessities in irrigation and drainage engineering. Two popular infiltration models called Kostiakov and Modified Kostiakov, which are largely used in the fields, are considered for analysis. The problem is modeled as a least sum of squares of the differen...