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4. Rational Method (20 points): A nonhomogencous watershed has the following distribution of landcover: Land Runoff...
Compute the peak runoff rate from a 100-acre watershed for a 100-yr storm using the rational...
Compute the peak runoff rate from a 100-acre watershed for a 100-yr storm using the rational method. The estimated 100-year rainfall rate for the catchment is 7 in/hour. Corn is grown on 20 acres of soil group B and remainder of catchment is in permanent pasture, soil group C. (Use a weighted average for the runoff coefficient.)
what does PFDS needed mean Calculation of peak discharge (10) B. Tube The rational method is...
what does PFDS needed mean
Calculation of peak discharge (10) B. Tube The rational method is the most common method for estimating peak stormflow discharge from small watersheds. (see pages 151-152, in text). metric-unit version of the equation (p. 151, eq. 6.6). 1. The text gives The older U.S. rational method equation (but still used!) is: "q =Ci A", where q is the peak flow from a given storm (cfs), C is a runoff constant (dimensionless), i is the intensity...
Use the Rational Method to evaluate the effect of a proposed subdivision development on the 10-...
Use the Rational Method to evaluate the effect of a proposed subdivision development on the 10- year peak discharge for a 40-acre subcatchment near Iowa City (section 6. The pre development and post-development water shed characteristics are shown below. The Hydrologic Soil Group is B for the soils at the site. Before/After Before Development 40 % Lawns (Good Condition) After Development | 70% Multi-Unit (Attached) Land Use | 60 % Parks te(minutes) 60 30% Parks 15 Estimate the Rational Method...
USING KIRPICH METHOD IN DETERMINING TIME OF CONCENTRATION: L 1.15 tc 51H0.385 Where: . L S...
USING KIRPICH METHOD IN DETERMINING TIME OF CONCENTRATION: L 1.15 tc 51H0.385 Where: . L S H Time of concentration (minutes) Length of watercourse (m) Average basin slope (S=HL) Difference in elevation (m) i = 5.41270.1614 (10)(1+0.56)0.936 where: i = rainfall intensity(mm/h) T = Return period (years) D = rainfall duration, tc (hours) Storm water quantity can be estimated by this method. Q=C.I.A / 360 Where, Q = quantity of storm water, m3/sec C= coefficient of runoff I = intensity...
determine the peak flow at point C using the Rational Method. The time of concentration should be calculated using ASCE...
determine the peak flow at point C using the Rational Method. The time of concentration should be calculated using ASCE Kinematic Wave equation. 1) A storm drain system is shown in the figure below. For the flow conditions indicated, IDF equation 110 tc + 16 Where: i- intensity [in h ; tc-time of concentration [min] 0.94 L0.6 no.6 Where: L=length of overland flow (ft); n= Manning's roughness coefficient (0.016); i= rainfall intensity (mm hr-) and S-average overland flow slope (ft...
Trenuevey 4. Mechanicsville has obtained a grant from the state government to build a condominium complex...
Trenuevey 4. Mechanicsville has obtained a grant from the state government to build a condominium complex for the retired. The total land set aside is 74,010 m². of this area 15,831 m² will be used for Swiss chalet condominiums with slate roofs (C = 0.75). Public streets and drives (C =0.70) will occupy 18,886 m². The remainder will be lawns. The area is flat and has a sandy soil (C = 0.05). Find the peak discharge from the development for...
1. The text gives a metric-unit version of the equation (p. 151, eq. 6.6). The older...
1. The text gives a metric-unit version of the equation (p. 151, eq. 6.6). The older U.S. rational method equation (but still used!) is: “q=C i A”, where q is the peak flow from a given storm (cfs), C is a runoff constant (dimensionless), i is the intensity of the rainfall (in/hr), and A is the watershed area (acres). Using a dimensional analysis, show why there need not be a conversion factor with this equation (i.e., Km = 1 for...
Problem 2: Designing Culverts Under a Bridge on El Rio de las Aguas Torenciales A 100-year stom e...
Problem 2: Designing Culverts Under a Bridge on El Rio de las Aguas Torenciales A 100-year stom event is being considered in order to design the culverts under a bridge. Figure 3 shows the storm event that may fall on the rural watershed of area 3.2 Km that drains into El Rio de las Aguas Torenciales. It generates runoff all over the watershed. The runoff flows into the river towards the ast point A (Figure 4) in the watershed where...
A developer purchased a 120 acre land in a sub-urban of Akron, Ohio. The land was...
A developer purchased a 120 acre land in a sub-urban of Akron, Ohio. The land was originally a range under a poor condition. The city zoning map shows a medium to low intensity residential zone for the division. He plans to build 220 single-family houses in this new sub-division. The new road will need 8 acres. The land management code also requires a forest preserve area for 20 percent of the total development area. What is the average size of...
Please help water resources 2. For the drainage system as shown in figure below, determine the...
Please help water resources
2. For the drainage system as shown in figure below, determine the design flow and determine the pipe size for each of the sewer section by rational method. The rainfall intensity (in/hr) is given by the IDF curve in second figure. The design frequency storm is 10-year storm. Flow from each area is shown by an arrow. The flow velocity in each pipe can be calculated by Manning's equation or Hazen-William equation by assuming a full...
what does PFDS needed mean
Calculation of peak discharge (10) B. Tube The rational method is the most common method for estimating peak stormflow discharge from small watersheds. (see pages 151-152, in text). metric-unit version of the equation (p. 151, eq. 6.6). 1. The text gives The older U.S. rational method equation (but still used!) is: "q =Ci A", where q is the peak flow from a given storm (cfs), C is a runoff constant (dimensionless), i is the intensity...
Use the Rational Method to evaluate the effect of a proposed subdivision development on the 10- year peak discharge for a 40-acre subcatchment near Iowa City (section 6. The pre development and post-development water shed characteristics are shown below. The Hydrologic Soil Group is B for the soils at the site. Before/After Before Development 40 % Lawns (Good Condition) After Development | 70% Multi-Unit (Attached) Land Use | 60 % Parks te(minutes) 60 30% Parks 15 Estimate the Rational Method...
USING KIRPICH METHOD IN DETERMINING TIME OF CONCENTRATION: L 1.15 tc 51H0.385 Where: . L S H Time of concentration (minutes) Length of watercourse (m) Average basin slope (S=HL) Difference in elevation (m) i = 5.41270.1614 (10)(1+0.56)0.936 where: i = rainfall intensity(mm/h) T = Return period (years) D = rainfall duration, tc (hours) Storm water quantity can be estimated by this method. Q=C.I.A / 360 Where, Q = quantity of storm water, m3/sec C= coefficient of runoff I = intensity...
determine the peak flow at point C using the Rational Method. The time of concentration should be calculated using ASCE Kinematic Wave equation. 1) A storm drain system is shown in the figure below. For the flow conditions indicated, IDF equation 110 tc + 16 Where: i- intensity [in h ; tc-time of concentration [min] 0.94 L0.6 no.6 Where: L=length of overland flow (ft); n= Manning's roughness coefficient (0.016); i= rainfall intensity (mm hr-) and S-average overland flow slope (ft...
Trenuevey 4. Mechanicsville has obtained a grant from the state government to build a condominium complex for the retired. The total land set aside is 74,010 m². of this area 15,831 m² will be used for Swiss chalet condominiums with slate roofs (C = 0.75). Public streets and drives (C =0.70) will occupy 18,886 m². The remainder will be lawns. The area is flat and has a sandy soil (C = 0.05). Find the peak discharge from the development for...
1. The text gives a metric-unit version of the equation (p. 151, eq. 6.6). The older U.S. rational method equation (but still used!) is: “q=C i A”, where q is the peak flow from a given storm (cfs), C is a runoff constant (dimensionless), i is the intensity of the rainfall (in/hr), and A is the watershed area (acres). Using a dimensional analysis, show why there need not be a conversion factor with this equation (i.e., Km = 1 for...
Problem 2: Designing Culverts Under a Bridge on El Rio de las Aguas Torenciales A 100-year stom event is being considered in order to design the culverts under a bridge. Figure 3 shows the storm event that may fall on the rural watershed of area 3.2 Km that drains into El Rio de las Aguas Torenciales. It generates runoff all over the watershed. The runoff flows into the river towards the ast point A (Figure 4) in the watershed where...
A developer purchased a 120 acre land in a sub-urban of Akron, Ohio. The land was originally a range under a poor condition. The city zoning map shows a medium to low intensity residential zone for the division. He plans to build 220 single-family houses in this new sub-division. The new road will need 8 acres. The land management code also requires a forest preserve area for 20 percent of the total development area. What is the average size of...
Please help water resources
2. For the drainage system as shown in figure below, determine the design flow and determine the pipe size for each of the sewer section by rational method. The rainfall intensity (in/hr) is given by the IDF curve in second figure. The design frequency storm is 10-year storm. Flow from each area is shown by an arrow. The flow velocity in each pipe can be calculated by Manning's equation or Hazen-William equation by assuming a full...
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