| Abstract |
The Khosla theory of flow nets has stood the test of time. It has been in use for designing the hydraulic structure for nearly a century by estimating the seepage properties like the pressure heads, seepage discharge, and exit gradient. In this method, flow nets, comprising equipotential lines and streamlines, are implemented to predict the movement of the water below the hydraulic structure to estimate the various seepage properties. The major limitation of the method lies in the important assumption of homogeneity and isotropy in the foundation of the soil. In this paper, we have aimed to address this limitation by using a commonly used finite difference groundwater flow model MODFLOW. We have created a 2D theoretical barrage model and tested for the various seepage properties in different hydrogeological conditions including anisotropy and different thickness of the saturated zone below the structure. The results showed that by increasing the anisotropy, the exit gradient increased manifold. When the depth increases, the exit gradient and discharge increases up to a certain limit, upon further increasing the depth, there was minimal effect on the exit gradient. The results shall help us to evaluate the uncertainty in estimating the seepage properties and improve the Khosla method in designing the hydraulic structures. |
| Authors |
Rath Prayas  , Kishanjit Kumar Khatua  , Kanhu Charan Patra
|
| Journal Info |
Springer Nature | Fluid Mechanics and Hydraulics , pages: 215 - 222
|
| Publication Date |
6/27/2023 |
| ISSN |
2366-2565 |
Type |
book-chapter |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1007/978-981-19-9151-6_18 |
| Keywords |
Soil Hydraulic Properties (Score: 0.586302) , Groundwater Flow (Score: 0.543004) , Suffusion Characteristics (Score: 0.540229) , Soil Water Characteristic (Score: 0.538256) , Dam Behaviour Modelling (Score: 0.53663)
|
