a rural kansas watershed that is ungauged has an area of 475 acres and a main channel length of 6870 feet with an average slope of 100 feet per mile. what is the peak flow in ft3/s for a 15-minute unit hydrograph using the scs unit hydrograph method

Answers

Answer 1

Answer:

[tex]\mathbf{Q_p =682 \ \ ft^3/s}[/tex]

Explanation:

Given that:

Area = 475 acres

The length of the channel (L) = 6870 feet

The average water shield slope (S) = 100 feet/mile

Since; 1 mile = 5280 feet

Burst duration D = 15 min

100 feet/mile = 100/5280

The average water shield slope (S) = 5/264

Using hydrograph method:

The time of concentration [tex]t_c = 0.0078L^{0.77} S^{-0.385}[/tex]

where;

L = 6870

S = 5/264

[tex]t_c = 0.0078(6870)^{0.77} (\dfrac{5}{264})^{-0.385}[/tex]

[tex]t_c =32.34[/tex] min

Since 60 min = 1 hour

32.34 min will be (32.34*1)/60

= 0.539 hour

Lag time [tex]T_l = 0.67\times t_c[/tex]

[tex]T_l = 0.67\times 32.34[/tex]

[tex]T_l = 21.6678\ min[/tex]

The time to peak i.e

[tex]T_p = \dfrac{D}{2}+ T_L \\ \\ T_p = \dfrac{15}{2}+ 21.6678 \\ \\ T_p = 29.168 \ min[/tex]

[tex]T_r = \dfrac{T_p}{5.5} \\ \\ T_r = \dfrac{29.1678}{5.5} \\ \\ T_r = 5.30 \ min[/tex]

Since D = 15 min is not equal to [tex]T_r[/tex], then we hydrograph apart from [tex]T_r[/tex] duration lag time.

Then;

[tex]T_p \ ' = T_p + \dfrac{D-t_r}{4} \\ \\ T_p \ ' = 29.168 + \dfrac{15-5.30}{4} \\ \\ T_p \ ' = 31.593[/tex]

Now, we need to determine the peak discharge [tex]Q_p[/tex] by using the formula:

[tex]Q_p = \dfrac{484 \times A}{T_p \ '}[/tex]

where

484 = peak factor

Recall that A = 475 acres, to miles, we have:

A = 0.7422 mile²

[tex]T_p \ ' = 31.593/60[/tex]

[tex]Q_p = \dfrac{484 \times 0.7422}{\dfrac{31.593}{60}}[/tex]

[tex]\mathbf{Q_p =682 \ \ ft^3/s}[/tex]


Related Questions

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O A. it has more colonies than other regions of the world.
O B. it has more available petroleum than other countries.
O C. it has many constitutional monarchies.
D. it started the Industrial Revolution.

Answers

Answer:

OA

Explanation:

Answer:

D

Explanation:

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Gender-based violence is defined as any acts of violence ordered at a individual because of their gender.

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Answers

Answer: A. Shri Lanka

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Anexo 5
agua
contaminantes
1. Completa el texto con las palabras del recuadro. Consulta las páginas 159 a 161 de tu libro de
texto SEP
Las actividades desempeñadas por los seres
para satisfacer sus necesidades se
han dado desde hace siglos, pero nunca habían afectado tanto al como en la
actualidad, puesto que hay una mayor Industrialización. Se toman más producios de
lana_y hay una mayor liberación de_ca Además, ya no sólo se
elaboran productos sino de lujo, omamento y recreación. Por otro lado, la contaminación
del
representa un problema ambiental porque pone en salud y la vida. Es un
hecho que los problemas ambientales a les la calidad de vida de la población, de ahi
la Importancia de
Lahora.
medio
ambiente
básicos
riesgo
2. Consulta la página 164 de tu libro de texto SEP y escribe algunas acciones para contribuir a la
reducción de los problemas ambientales.
naturaleza
afectan
actuar
humanos ayuda doy coronita​

Answers

Answer:

o texto ja esta completo agora cade as paginas que estao pedindo e so ler elas para saber a resposta

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Answers

Answer and Explanation:

Pangaea is the term used to describe the supercontinent that existed millions of years ago, before the continents were spread across the globe as we know it today. The separation of continents occurs due to the rapid convections of the Earth's mantle. These mantle convections increased volcanic activity on the earth, making volcanism very active and causing numerous volcanic eruptions, which increased the concentration of carbon dioxide in the atmosphere, increasing the greenhouse effect and creating a long period of intense global warming.

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La Soufriere Hills volcano is a group of active volcanoes. The volcanic eruptions altered the climatic conditions and led to natural selection.

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Answer:

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<< Read Less

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Answer:

Look below

Explanation:

Xi Jinping

Hope it helps!!

Answer:

Here is your answer

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Xi Jinping

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Answers

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Answer:

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Answers

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Answer:

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Answers

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[tex]\huge{\textbf{\textsf{{\orange{A}}{\blue{n}}{\pink{s}}{\purple{w}}{\red{e}}{\green{r}:}}}}[/tex]

[tex]\sf\purple{A. \:God\: promised \:the \:Israelites \:they \:were\: His\: chosen\: people.}[/tex]

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Answers

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Answers

Answer:

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Explanation:

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Answer:

Water is the answer.

Explanation:

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Answer:

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Answer:

Explanation:

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Answer:

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Answers

Answer:

B

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Answer:

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Answers

Answer:

Explanation:

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Answers

Answer:

10

Explanation:

Answer:

The square root of 100 is 10.

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Answers

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