The total direct runoff depth for a given rainfall event can be a negative value. True...
The total direct runoff depth for a given rainfall event can be a negative value. True or false? Explain.
Homework Answers
The direct runoff depth for a given rainfall can not be a negative value. The minimum value may be zero, when all precipitation percolates deep within ground and recharges ground water table. when railfall happens there are many losses occur like interception, depression storage ,evaporation , infiltertaion ... after these losses remaining water flow as overland flow or channel flow and joins main stream. this water flow is called direct runoff and its depth is knowd as direct runoff depth. it can not be negative.
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The total direct runoff depth for a given rainfall event can be
a negative value. True...
For the given table, if Direct Runoff depth is computed to be 101mm, determine the Runoff...
For the given table, if Direct Runoff depth is computed to be 101mm, determine the Runoff Coefficient, c. Express to the nearest 2 decimal digits. Time Observed Rainfall (mm) 9:00 43 9:30 53 10:00 5 10:30 5 11:00 11:30 12:00 12:30 13:00 13:30 14:00
For the table show, determine the Direct Runoff depth. Express in the nearest whole number value...
For the table show, determine the Direct Runoff depth. Express in the nearest whole number value in mm. Note that the given is observed Runoff, not yet Direct Runoff. Observed Observed Time Rainfall Runoff (mm) (m3/s) 9:00 43 23 9:30 53 65 10:00 5 161 10:30 5 270 11:00 312 11:30 233 12:00 122 12:30 63 13:00 51 13:30 35 14:00 20 watershed area 18.22 km2 baseflow 11.34 m3/s
6. Total direct runoff was measured as 5.0 inches from the | following total rainfall hyetograph....
6. Total direct runoff was measured as 5.0 inches from the | following total rainfall hyetograph. Find a Phi (d) index [15] t (in/hr) to separate infiltration loss. 4 3 2 3 4 Time (hr) □0.3 □0.5 □ 0.4
2. [20 pts] Draw the direct runoff hydrograph for a 2-hr effective rainfall that generates total...
2. [20 pts] Draw the direct runoff hydrograph for a 2-hr effective rainfall that generates total 3 inch of runoff 1-hr Unit Hydrograph 120 100 80 60 40 20 Time (hr) DRO DRO-5 tvo
Hydrologic analysis of a watershed Problem2: The unit hydrograph is the direct runoff generated by 1 unit (I mm in this...
Hydrologic analysis of a watershed Problem2: The unit hydrograph is the direct runoff generated by 1 unit (I mm in this problem) of excess rainfall. The one-hour unit hydrograph of a watershed is given by: 4 Time (hour) -0.9 U0.4 U0.2 0.0 0.0 U-0.6 Unit hydrograph (m/s/mm) (a) The 100-year storm over the watershed has the following excess rainfall pulses: Fromt 0 to 1 hour, P45 mm From t I to 2 hours, P20 From t = 2 to 3...
10 5 The total rainfall hyetograph of a storm, which took place over a basin is...
10 5 The total rainfall hyetograph of a storm, which took place over a basin is given below. Ordinates of Total Storm Hydrograph (TSH) obtained for the basin is given in the table below. The baseflow is constant and is 3 m/s. If the depth of excess rainfall is 6 cm, determine: a) depth of direct runoff, i (mm/hr) b) depth of infiltrated water, c) -index, d) equation of surface runoff hydrograph in terms of UH3 and lag times. e)...
In a rain event in the basin Rainpourshed, total rainfall in five hours is 7.5 inches....
In a rain event in the basin Rainpourshed, total rainfall in five hours is 7.5 inches. The infiltration rate is assumed as 0.5 in/hr for the whole event. If the total runoff from the event is 10,000 cfs-hr, what is area of the basin Rainpurshed in acres? 1 cfs - 1.008 ac-in./hr
2. Given the data in the table below, answer questions a) 40 e) rainfall (mm) (runoff...
2. Given the data in the table below, answer questions a) 40 e) rainfall (mm) (runoff (mm) 0 0 0 0 O 0 0 0 0 150 200 a) create a scatter plot using these data b) determine the linear regression equation and correlation coeficient include details from the method you used to find the equation: Excel Geodebra, or open office file image of graphing calculator or manual calculations () is this a positive or negative correlation? is ita weak...
3. The stream flow given in the following table was produced by a 1-cm rainfall event...
3. The stream flow given in the following table was produced by a 1-cm rainfall event (total depth). The effective portion of the rainfall lasted 1 hr (from time 9 to time 10). If the watershed is 20 square kilometers, derive a 1-hr unit hydrograph for the watershed. Assume the groundwater contribution is linear from 1.4 m/sec (at time 9) to 3.0 m/sec (at time 17). Time (hrs) Q (m/sec ) 8 1.6 9 1.4 10 4.6 11 9.7 12...
Negative predictive value is a probability of not having disease given that you have just tested...
Negative predictive value is a probability of not having disease given that you have just tested negative and is expressed as O a. True negative/(True negative False Positive) O b. True positive/(True positive False Negative) О c. True Negative/(True negative + False Negative) O d. True positive/True positive False Positive) QUESTION 10 Positive predictive value is the probability that subjects with a positive screening test truly have the disease. The equation for positive predictive value is expressed as: O 3....
For the given table, if Direct Runoff depth is computed to be 101mm, determine the Runoff Coefficient, c. Express to the nearest 2 decimal digits. Time Observed Rainfall (mm) 9:00 43 9:30 53 10:00 5 10:30 5 11:00 11:30 12:00 12:30 13:00 13:30 14:00
For the table show, determine the Direct Runoff depth. Express in the nearest whole number value in mm. Note that the given is observed Runoff, not yet Direct Runoff. Observed Observed Time Rainfall Runoff (mm) (m3/s) 9:00 43 23 9:30 53 65 10:00 5 161 10:30 5 270 11:00 312 11:30 233 12:00 122 12:30 63 13:00 51 13:30 35 14:00 20 watershed area 18.22 km2 baseflow 11.34 m3/s
6. Total direct runoff was measured as 5.0 inches from the | following total rainfall hyetograph. Find a Phi (d) index [15] t (in/hr) to separate infiltration loss. 4 3 2 3 4 Time (hr) □0.3 □0.5 □ 0.4
2. [20 pts] Draw the direct runoff hydrograph for a 2-hr effective rainfall that generates total 3 inch of runoff 1-hr Unit Hydrograph 120 100 80 60 40 20 Time (hr) DRO DRO-5 tvo
Hydrologic analysis of a watershed Problem2: The unit hydrograph is the direct runoff generated by 1 unit (I mm in this problem) of excess rainfall. The one-hour unit hydrograph of a watershed is given by: 4 Time (hour) -0.9 U0.4 U0.2 0.0 0.0 U-0.6 Unit hydrograph (m/s/mm) (a) The 100-year storm over the watershed has the following excess rainfall pulses: Fromt 0 to 1 hour, P45 mm From t I to 2 hours, P20 From t = 2 to 3...
10 5 The total rainfall hyetograph of a storm, which took place over a basin is given below. Ordinates of Total Storm Hydrograph (TSH) obtained for the basin is given in the table below. The baseflow is constant and is 3 m/s. If the depth of excess rainfall is 6 cm, determine: a) depth of direct runoff, i (mm/hr) b) depth of infiltrated water, c) -index, d) equation of surface runoff hydrograph in terms of UH3 and lag times. e)...
In a rain event in the basin Rainpourshed, total rainfall in five hours is 7.5 inches. The infiltration rate is assumed as 0.5 in/hr for the whole event. If the total runoff from the event is 10,000 cfs-hr, what is area of the basin Rainpurshed in acres? 1 cfs - 1.008 ac-in./hr
2. Given the data in the table below, answer questions a) 40 e) rainfall (mm) (runoff (mm) 0 0 0 0 O 0 0 0 0 150 200 a) create a scatter plot using these data b) determine the linear regression equation and correlation coeficient include details from the method you used to find the equation: Excel Geodebra, or open office file image of graphing calculator or manual calculations () is this a positive or negative correlation? is ita weak...
3. The stream flow given in the following table was produced by a 1-cm rainfall event (total depth). The effective portion of the rainfall lasted 1 hr (from time 9 to time 10). If the watershed is 20 square kilometers, derive a 1-hr unit hydrograph for the watershed. Assume the groundwater contribution is linear from 1.4 m/sec (at time 9) to 3.0 m/sec (at time 17). Time (hrs) Q (m/sec ) 8 1.6 9 1.4 10 4.6 11 9.7 12...
Negative predictive value is a probability of not having disease given that you have just tested negative and is expressed as O a. True negative/(True negative False Positive) O b. True positive/(True positive False Negative) О c. True Negative/(True negative + False Negative) O d. True positive/True positive False Positive) QUESTION 10 Positive predictive value is the probability that subjects with a positive screening test truly have the disease. The equation for positive predictive value is expressed as: O 3....
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