Q.2
Match List-I with List-II pertaining to side slopes for preliminary design of earthen dams:
Choose the correct answer from the options given below:
|
List - I
सूची - I
Dam Core / Material Type
List-I (Dam Core / Material Type
|
List - II
सूची - II
Recommended Upstream Slope, H:V
List-II (Recommended Upstream Slope, H:V
|
||
|---|---|---|---|
| A | Homogeneous well-graded material Homogeneous well-graded material | I | $2.5:1$ to $3:1$ $2.5:1$ to $3:1$ |
| B | Homogeneous coarse silt Homogeneous coarse silt | II | $3:1$ to $3.5:1$ $3:1$ to $3.5:1$ |
| C | Homogeneous clay / fine silt Homogeneous clay / fine silt | III | $3:1$ to $4:1$ $3:1$ to $4:1$ |
| D | Sand or gravel with clay core Sand or gravel with clay core | IV | $2.5:1$ to $3:1$ $2.5:1$ to $3:1$ |
EXPLANATION
Hydraulic Jump Mechanics & Spillway Engineering (Drop, Drop-Inlet, Chute Spillways & Farm Ponds)
- Preliminary Side Slope Guidelines for Earthen Dams (IS Standards):
- Homogeneous Well-Graded Material: Upstream slope typically designed at $2.5:1$ to $3:1$ (H:V) $\rightarrow$ (I)
- Homogeneous Coarse Silt: Requires gentler upstream slopes of $3:1$ to $3.5:1$ $\rightarrow$ (II)
- Homogeneous Clay / Fine Silt: Subject to rapid drawdown instability, requiring flat slopes of $3:1$ to $4:1$ $\rightarrow$ (III)
- Sand or Gravel with Impervious Core: Free-draining shells permit steeper slopes of $2.5:1$ to $3:1$ $\rightarrow$ (IV)
- Systematic Match: Corresponds to Option 4.
Correct option: (4) (A) - (Il), (B) - (IV), (C) - (1), (D) - (ath)
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