6. Surface Water Hydrology (20 Points) What is a rating curve? How would you con

Question

6. Surface Water Hydrology (20 Points) What is a rating curve? How would you construct a rating curve for a river? What are the advantages of indirect methods of determining discharge of a river compared to the direct methods? What are the disadvantages? A. B. Field measurements of width, depth and velocity at a river cross section are given in the following Table 1. (a) Plot the cross section on a graph paper. (b) Estimate the discharge through the section of the river. [Show, in a tabular form, calculations for all sub-areas that you use in your computation. Table 1: Field measurement data of width, depth and velocity for Problem 4 VerticalSection Depth Average SectionWidth (m) (m) Velocity Number (m/s) 0 6.8 1.8 5.5 5.5 4.2 4.8 5.9 5.8 4.0 4.6 0 2.4 2.9 3.8 4.7 3.2 2.1 0.7 0.8 1.2 1.6 2.1 2.9 1.9 1.1 0.6

Explanation / Answer

A)

A rating curve is a graph of stage of the water versus discharge.

The rating curve is generally plotted by taking discharge on x-axis and stage on y-axis. The advantage of measuring the discharge of a river by indirect methods like float gauging and current metering is, they can be used for larger streams and rivers. The disadvantages are, 1. because of finite number of measuring points, complex velocity profiles are not represented correctly. 2.difficult to accurately measure the flow reversals and trasversing apparatus may disrupt the flow field.

B.

a) Cross section graph

b)

The discharge is the product of stream width, depth and velocity.

Related Questions

Navigate

• Browse (All)
• Browse 6
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.