Question
Download Solution PDFIn order to allow the seepage water to escape without dislocating the soil particles a/an __________ is provided at the downstream end of the impervious floor of a weir.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFProvision to Allow Seepage Water to Escape:
In order to allow the seepage water to escape without dislocating the soil particles, an appropriate structure is provided at the downstream end of the impervious floor of a weir. Each option is explained below:
- Inverted Filter:
- An inverted filter is provided at the downstream end of the impervious floor of a weir to allow seepage water to escape without dislocating the soil particles. It consists of layers of different-sized aggregates that help filter out soil particles while allowing water to pass through. This prevents the soil from being eroded by the seepage water, thereby maintaining the stability of the weir structure.
- Pervious Floor:
- A pervious floor allows water to pass through it. However, it is not specifically designed to filter out soil particles and might not be as effective in preventing soil erosion caused by seepage water. Pervious floors are typically used in other contexts where water permeability is desired, but not for the purpose of protecting against soil particle dislocation.
- Graded Filter:
- A graded filter is similar to an inverted filter in that it consists of layers of different-sized aggregates. It is used to filter out soil particles and allow water to pass through. While the function is similar to an inverted filter, the term "inverted filter" is more specifically used in the context of weir structures to describe the filtering mechanism placed at the downstream end.
- Launching Apron:
- A launching apron is a protective layer placed at the downstream end of hydraulic structures like weirs and barrages. It is designed to spread out and settle on the riverbed when scouring occurs, thereby providing protection against erosion. However, it is not specifically intended to filter out soil particles from seepage water.
Based on the specific requirement of allowing seepage water to escape without dislocating soil particles, the
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