Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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**Hydrograph Analysis from a Storm**

**Problem 1:** The diagram exhibits the flow hydrograph resulting from a storm event.

### Aspects to Label:
1. **Initial Abstraction**: This refers to the initial portion of precipitation that does not contribute to direct runoff, such as infiltration and surface storage.
   
2. **Direct Flow Hydrograph and Baseflow**: The hydrograph should differentiate between the direct runoff, indicated by the rising and falling limbs, and the baseflow, which is the sustained flow between storm events.

3. **Time to Peak, Time of Concentration, and Time Base of the Direct Flow Hydrograph**: 

   - **Time to Peak**: The duration from the start of the rainfall event until the hydrograph reaches its peak discharge.
   
   - **Time of Concentration**: The time it takes for water to travel from the most distant point in the watershed to the watershed outlet.
   
   - **Time Base**: The total time period over which the direct runoff occurs.

### Diagram Explanation:
- **Infiltration Capacity Graph**: Located on the left, the inset graph displays the infiltration rate decreasing over time (i), as shown by the red line. This decrease typically follows an exponential decay pattern.

- **Main Hydrograph Curve**: On the right, the hydrograph plot emphasizes the relationship between discharge (Q) over time (t). The curve initially rises, reaches a peak, and then recedes, illustrating the typical response of a watershed to a rainfall event.

**Figure Reference**: Caption - "The hydrograph of a storm and the resulting flow hydrograph at the watershed outlet."
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Transcribed Image Text:**Hydrograph Analysis from a Storm** **Problem 1:** The diagram exhibits the flow hydrograph resulting from a storm event. ### Aspects to Label: 1. **Initial Abstraction**: This refers to the initial portion of precipitation that does not contribute to direct runoff, such as infiltration and surface storage. 2. **Direct Flow Hydrograph and Baseflow**: The hydrograph should differentiate between the direct runoff, indicated by the rising and falling limbs, and the baseflow, which is the sustained flow between storm events. 3. **Time to Peak, Time of Concentration, and Time Base of the Direct Flow Hydrograph**: - **Time to Peak**: The duration from the start of the rainfall event until the hydrograph reaches its peak discharge. - **Time of Concentration**: The time it takes for water to travel from the most distant point in the watershed to the watershed outlet. - **Time Base**: The total time period over which the direct runoff occurs. ### Diagram Explanation: - **Infiltration Capacity Graph**: Located on the left, the inset graph displays the infiltration rate decreasing over time (i), as shown by the red line. This decrease typically follows an exponential decay pattern. - **Main Hydrograph Curve**: On the right, the hydrograph plot emphasizes the relationship between discharge (Q) over time (t). The curve initially rises, reaches a peak, and then recedes, illustrating the typical response of a watershed to a rainfall event. **Figure Reference**: Caption - "The hydrograph of a storm and the resulting flow hydrograph at the watershed outlet."
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