wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The peak ordinate of 4 h unit hydrograph of a basin is 60 m3/s. An isolated storm of 4 hour duration in the basin was recorded to have a total rainfall of 8 cm. If it is assumed that the base flow and the ϕindex are 30 m3/s and 0.25 cm/hr respectively, the peak of the flood discharge due to the storm could be estimated as.

A
210 m3/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
420 m3/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
450 m3/s
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
240 m3/s
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 450 m3/s
Peak discharge of unit hydrograph
=60 m3/s

Now, the peak of direct runoff hydrograph
=60×effective runoff
=60×(84×0.25)
=420 m3/s

Hence, peak of flood hydrograph
=(420+30)=450 m3/s

flag
Suggest Corrections
thumbs-up
1
similar_icon
Similar questions
View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Introduction and Basic Assumptions of Unit Hydrograph
HYDROLOGY & IRRIGATION
Watch in App
Join BYJU'S Learning Program
CrossIcon