short answers T F When using the runoff coefficient, c, the Rational Method assumes that land...

short answers

T F When using the runoff coefficient, c, the Rational Method assumes that land uses are uniformly distributed within a drainage area.

What is the overland flow travel time for a hydraulic path 140 ft long through dense grass at an average slope of 1.0%?

1 minute

4 minutes

21 minutes

25 minutes

The rational method assumes rainfall duration equal to the time of concentration. If an estimated time of concentration is larger than the actual time of concentration for the drainage area, the peak runoff determined will be (greater than, equal to, less than) the actual peak discharge.

T F A storm with a return period of 25 years will occur only once every 25 years.

A drainage basin’s “time of concentration” means the time

the time for the first raindrop to flow down the steepest slope in the area.
the time to drain the drainage area after the rain stops.
the longest time of flow to the point of interest.
the time that is equal to the duration of the rainfall event.

(12 pts) The three general types of flow that could occur along the hydraulic path in a drainage area are ______________________________ flow, ______________________________flow, and ______________________________ flow.

The average rainfall rate in inches/hour is called the

duration.
return period.
frequency.
intensity.

A drainage basin is defined as the

boundary separating two adjacent rainfall collection basins.
surface preventing infiltration of water into the soil.
land surface having similar characteristics with a single outflow point.
continental divide.

What is the shallow concentrated flow travel time for a hydraulic path 540 ft long through average grass at an average slope of 3.4%?

179 minutes
18 minutes
4 minutes
3 minutes

What is the channel flow travel time for a hydraulic path 2000 ft long and a velocity of 9.52 ft/sec?

3.5 minutes
5.3 minutes
21 minutes
210 minutes

Solutions

Expert Solution

Ally Wells answered 10 months ago

Next > < Previous

Related Solutions

In rational method, the peak runoff is given by Q = Cf. C. i. A. The...

In rational method, the peak runoff is given by Q = Cf. C. i. A. The intensity i can be obtain from IDF curves. Discuss why a duration equal to time of concentration is used to determine the intensity

You are using the rational method for calculating the surface runoff in a rural area. The...

You are using the rational method for calculating the surface runoff in a rural area. The area is flat, permeable grassland. Calculate the runoff coefficient (C).

Using the rational method, determine the amount of runoff that would occur for a paved parking...

Using the rational method, determine the amount of runoff that would occur for a paved parking lot that is 100m * 50m and is uniformly sloped from one long edge to the other long edge at a rate of 2%. The time of concentration for this parking is 4 minutes. The five-year storm with duration of 4 minutes has an intensity of 10 mm/hr. The runoff coefficient for this parking lot is 0.80.آ [Q=0.166 CIA] The runoff from part (a)...

Using the rational method, determine the amount of runoff that would occur for a paved parking...

Describe briefly the principle of the Rational method and the limitation of this method for runoff...

Describe briefly the principle of the Rational method and the limitation of this method for runoff estimation. A sub-catchment of area 0.1km2 is built on gently sloping land. The average slope of the land is 0.001. The length of the longest natural flow path L is 276.3m. The flow time tf in the drainage system is 3min. Determine the 50yr design discharge for the subdivision using the rational method, given that the average runoff coefficient of the subdivision is C=0.7....

“runoff coefficient” and a “hydrologic abstraction”? a. What is the method or concept in question and...

“runoff coefficient” and a “hydrologic abstraction”? a. What is the method or concept in question and how is it used? b. Why does it matter to engineers or to engineering hydrologists? Why should we care? c. What are the primary strengths or weaknesses of the method or concept? d. What would have made it easier for you to understand the method or concept? Here, for example, you might imagine that you are giving advice to a friend taking this course...

Followings are given for a watershed: Rational method coefficient C = 0.35 Time of concentration =...

Followings are given for a watershed: Rational method coefficient C = 0.35 Time of concentration = 60 min Area A = 4.2 km^2 Rainfall intensity is 1.7 cm/hr Part A: If rainfall duration is 60 min, determine the peak discharge in m^3/s. Part B: If rainfall duration is 90 min, determine the peak discharge in m^3/s.

In the Rational Method the peak runoff resulting from a rainfall event depends on which of...

In the Rational Method the peak runoff resulting from a rainfall event depends on which of the following factors The frequency and duration of the rainfall event. The size of the area on which the rainfall lands. The characteristics of the surface over which the rainwater flows. The time that has elapsed since the last rainfall event. I, II, III and IV. I, II and III only. I and III only. II and III only. Which of the following are...

True or False (T/F) a. When the correlation coefficient of the two asset’s return is 1,...

True or False (T/F) a. When the correlation coefficient of the two asset’s return is 1, there is the greatest diversification benefit. ( ) b. If the NPV of a project is negative, the project should be accepted ( ). c. Increase in net working capital indicates cash inflow for a project ( ).

Let f(t)=5t2−t. a) Find f(t+h): b) Find f(t+h)−f(t): c) Find f(t+h)−f(t)/h: side note: (f(t+h)=f(t) is on...

Let f(t)=5t2−t. a) Find f(t+h): b) Find f(t+h)−f(t): c) Find f(t+h)−f(t)/h: side note: (f(t+h)=f(t) is on top of fraction and h is on bottom) d) Find f′(t): pls circle the 4 answers

Subjects