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A 8 hour unit hydrograph of a catchment of area 220 km2 is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, due to 3 cm of effective rainfall for 4 hours will have a peak flow rate of _______m3/s.
Correct answer is '73-74'. Can you explain this answer?
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A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular...
Area of triangle OAB = Volume of runoff water
½ × QP × 50 × 60 × 60 = 220 × 106 m2 × 1 cm
⇒QP = 220×106 × 
Qp = 24.44 m3/s
For the Direct Runoff Hydrograph.
QPDRH = 3 × 24.44 m3/s
QPDRH = 73.33 m3/s
Most Upvoted Answer
A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular...
Calculation of the peak flow rate of direct runoff hydrograph:
1. Calculation of the catchment average rainfall intensity:
- Effective rainfall = 3 cm
- Duration of effective rainfall = 4 hours
- Catchment area = 220 km^2
- Catchment average rainfall intensity = Effective rainfall / Duration of effective rainfall
= 3 cm / 4 hours
= 0.75 cm/hour
= 0.0075 m/hour
2. Calculation of the volume of direct runoff:
- Volume of direct runoff = Catchment average rainfall intensity * Catchment area
= 0.0075 m/hour * 220 km^2
= 1650 m^3/hour
3. Calculation of the time base of the direct runoff hydrograph:
- Time base of the direct runoff hydrograph = Base width of the unit hydrograph
= 50 hours
4. Calculation of the peak flow rate:
- Peak flow rate = Volume of direct runoff / Time base of the direct runoff hydrograph
= 1650 m^3/hour / 50 hours
= 33 m^3/hour
= 33 / 3600 m^3/s
≈ 0.00917 m^3/s
Therefore, the peak flow rate of the direct runoff hydrograph is approximately 0.00917 m^3/s.
Explanation:
- A unit hydrograph is a hypothetical hydrograph representing the direct runoff response of a catchment to a unit of effective rainfall.
- The given unit hydrograph is triangular in shape with a base width of 50 hours. This means that the direct runoff response of the catchment to a unit of effective rainfall lasts for 50 hours.
- The direct runoff hydrograph represents the runoff response of the catchment to a specific amount and duration of effective rainfall.
- In this case, the direct runoff hydrograph is influenced by 3 cm of effective rainfall over a duration of 4 hours.
- By calculating the catchment average rainfall intensity and the catchment area, we can determine the volume of direct runoff.
- The time base of the direct runoff hydrograph is given as 50 hours, which represents the duration of the direct runoff response.
- Dividing the volume of direct runoff by the time base gives us the peak flow rate of the direct runoff hydrograph.
- The calculated peak flow rate is approximately 0.00917 m^3/s, which can be rounded to 0.009 m^3/s or 9 l/s.
- The correct answer given is '73-74', which does not match the calculated value. It is possible that there was an error in the answer or a misunderstanding of the question.
1. Calculation of the catchment average rainfall intensity:
- Effective rainfall = 3 cm
- Duration of effective rainfall = 4 hours
- Catchment area = 220 km^2
- Catchment average rainfall intensity = Effective rainfall / Duration of effective rainfall
= 3 cm / 4 hours
= 0.75 cm/hour
= 0.0075 m/hour
2. Calculation of the volume of direct runoff:
- Volume of direct runoff = Catchment average rainfall intensity * Catchment area
= 0.0075 m/hour * 220 km^2
= 1650 m^3/hour
3. Calculation of the time base of the direct runoff hydrograph:
- Time base of the direct runoff hydrograph = Base width of the unit hydrograph
= 50 hours
4. Calculation of the peak flow rate:
- Peak flow rate = Volume of direct runoff / Time base of the direct runoff hydrograph
= 1650 m^3/hour / 50 hours
= 33 m^3/hour
= 33 / 3600 m^3/s
≈ 0.00917 m^3/s
Therefore, the peak flow rate of the direct runoff hydrograph is approximately 0.00917 m^3/s.
Explanation:
- A unit hydrograph is a hypothetical hydrograph representing the direct runoff response of a catchment to a unit of effective rainfall.
- The given unit hydrograph is triangular in shape with a base width of 50 hours. This means that the direct runoff response of the catchment to a unit of effective rainfall lasts for 50 hours.
- The direct runoff hydrograph represents the runoff response of the catchment to a specific amount and duration of effective rainfall.
- In this case, the direct runoff hydrograph is influenced by 3 cm of effective rainfall over a duration of 4 hours.
- By calculating the catchment average rainfall intensity and the catchment area, we can determine the volume of direct runoff.
- The time base of the direct runoff hydrograph is given as 50 hours, which represents the duration of the direct runoff response.
- Dividing the volume of direct runoff by the time base gives us the peak flow rate of the direct runoff hydrograph.
- The calculated peak flow rate is approximately 0.00917 m^3/s, which can be rounded to 0.009 m^3/s or 9 l/s.
- The correct answer given is '73-74', which does not match the calculated value. It is possible that there was an error in the answer or a misunderstanding of the question.
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A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer?
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A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer?.
A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 8 hour unit hydrograph of a catchment of area 220 km2is a triangular in shape with base width of 50 hours. A direct runoff hydrograph (DRH) of this catchment, dueto 3 cm of effective rainfall for4 hourswill have a peak flow rateof_______m3/s.Correct answer is '73-74'. Can you explain this answer?.
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