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Kitty [74]
3 years ago
10

Consider a catchment that has a total area of 2.1 acres. Runoff from the entire catchment flows into one pipe inlet. Part of the

catchment is a softball field (1.5 ac) and the other part is a set of paved tennis courts (0.6 ac). The softball field has a C value of 0.3 and a time of concentration of 7 minutes, and the paved area has a C value of 0.95 and a time of concentration of 2 minutes. The IDF curve is given by i =100/(tc + 10) where i is in in/hr and tc is in minutes. Determine the design storm intensity and flow rate for the following cases: (a) The usual method based on the entire drainage area contributing to flow. (b) A modified method that assumes that only the paved tennis courts contribute to flow. (c) A different modified method that assumes a time of concentration of 2 minutes, and an approximation that the entire tennis court region contributes flow and 2/7 of the softball region contributes flow. Comment on the results and their impact on design. Is it always best to use method (a)

Engineering
1 answer:
sattari [20]3 years ago
5 0

Find the given attachment

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one number is 11 more than another number. find the two number if three times the larger number exceeds four times the smaller n
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Answer:

a = 40

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Explanation:

Give a place holder for the numbers that we don't know.

Lets call the two numbers a and b.

From the given info, we can write an expression and solve it:

"one number is 11 more than another number"

a = 11 + b

from this, we know that a > b.

''three times the larger number exceeds four times the smaller number by 4"

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Now we have 2 equations, we can use them to solve using whatever method you want.

a = 11 + b

3a = 4b + 4

I will be using matrices RREF to solve for this.

a - b = 11

3a - 4b = 4

\begin{bmatrix}1 & -1  & 11\\3 & -4 & 4 \end{bmatrix}

\begin{bmatrix}1 & 0  & 40\\0 & 1 & 29 \end{bmatrix}

a = 40

b = 29

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''.''

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