A 2 L beaker of Rhodamine B dye, with a reported dye concentration of 2.42x104 µg/L, was instantaneously poured into Rist Creek at flood stage. Using a fluorometer, the river cross-section sampled 225 m downstream (D/S), with the sampling results shown below. D/S measured dye concentration (µg/L) was subsequently Time (min:sec) 0:00 4:40 5:00 5:20 5:40 6:00 6:20 6:40 0.0 0.0 5.3 4.6 4.6 4.6 4.1 30

A 2 L beaker of Rhodamine B dye, with a reported dye concentration of 2.42x104 µg/L, was instantaneously poured into Rist Creek at flood stage. Using a fluorometer, the river cross-section sampled 225 m downstream (D/S), with the sampling results shown below. D/S measured dye concentration (µg/L) was subsequently Time (min:sec) 0:00 4:40 5:00 5:20 5:40 6:00 6:20 6:40 0.0 0.0 5.3 4.6 4.6 4.6 4.1 30

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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Concept explainers

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

a) Assuming no intervening dye losses, determine the average stream flood discharge in m 3/s.
(b) What is the average flow velocity in this stream reach?
(c) What is the average flood flow cross-sectional area of this creek?

A 2 L beaker of Rhodamine B dye, with a reported dye concentration of 2.42x104 µg/L, was
instantaneously poured into Rist Creek at flood stage. Using a fluorometer, the river cross-section
was subsequently sampled 225 m downstream (D/S), with the sampling results shown below.
D/S measured dye
concentration (µg/L)
Time
(min:sec)
0:00
4:40
5:00
5:20
5:40
6:00
6:20
6:40
7:00
7:20
7:40
8:00
0.0
0.0
5.3
4.6
4.6
4.6
4.1
3.0
1.8
0.5
0.15
0.0

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