**Problem 4: Hydrograph Derivation and Comparison**A 60 mi² drainage area exhibits the following characteristics: - Longest flow path length of 10 miles- Flow path length from outlet to centroid of 3.2 miles- Overland slope of 0.05- Curve number of 82- Basin coefficient of 1.35- Storage coefficient of 0.6**Tasks:**a. **Derive a 1-hour Unit Hydrograph (UH):** i. **Snyder UH** ii. **SCS Triangular UH** b. **Plot the Resulting Hydrographs:**Combine both hydrographs on a single plot. Evaluate and comment on the differences in key characteristics such as:- Peak discharge- Peak timing- Hydrograph shape- VolumeDiscuss these differences to understand how each method reflects the drainage area characteristics.

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Answered: 4. A 60 mi² drainage area has the…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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**Problem 4: Hydrograph Derivation and Comparison**

A 60 mi² drainage area exhibits the following characteristics:

- Longest flow path length of 10 miles
- Flow path length from outlet to centroid of 3.2 miles
- Overland slope of 0.05
- Curve number of 82
- Basin coefficient of 1.35
- Storage coefficient of 0.6

**Tasks:**

a. **Derive a 1-hour Unit Hydrograph (UH):**

i. **Snyder UH**

ii. **SCS Triangular UH**

b. **Plot the Resulting Hydrographs:**

Combine both hydrographs on a single plot. Evaluate and comment on the differences in key characteristics such as:

- Peak discharge
- Peak timing
- Hydrograph shape
- Volume

Discuss these differences to understand how each method reflects the drainage area characteristics.

Expert Solution

Step 1: Given data:

$Drainage space area space straight A equals 60 space mi squared longest space flow space path space straight L equals straight L subscript straight w equals 10 space mi length space of space the space flow space path space from space outlet space to space centroid space straight L subscript ca equals 3.2 space mi overland space slope space straight S subscript straight w equals 0.05 curve space number space left parenthesis CN right parenthesis equals 82 basin space coefficient space straight C subscript straight t equals 1.35 storage space coefficient space straight C subscript straight p equals 0.6 straight D space equals space 1 space hr$

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