Civil Engineering - Water Resources Engineering - Discussion
Discussion Forum : Water Resources Engineering - Section 2 (Q.No. 27)
27.
The rate of rainfall for successive 10 minute periods of a 60 minute duration storm, are shown in the below figure. If the value of φindex is 3 cm/hour, the run off will be
Discussion:
16 comments Page 1 of 2.
Indhu said:
3 years ago
R = (3*10/60) + (7*10/60) + (5*10/60) + (3*10/60).
R = 3cm Or 30mm.
R = 3cm Or 30mm.
(2)
Lokesh said:
3 years ago
By definition, φ index is the average rainfall above which the rainfall volume is equal to the runoff volume.
In the above graph, if the whole graph represents the total precipitation of that period, so the remaining area above the phi index line should be considered as runoff. From by graph- 19cm should be the runoff volume.
In the above graph, if the whole graph represents the total precipitation of that period, so the remaining area above the phi index line should be considered as runoff. From by graph- 19cm should be the runoff volume.
(4)
Soham Patel said:
4 years ago
I think 3 is correct but it is Av.Runoff for time period of 60 min.
(2)
A G said:
6 years ago
$ index = p-q/t.
3/60 = 60+70-q/60.
q = 127.
so, 60+70-127 = 3.
3/60 = 60+70-q/60.
q = 127.
so, 60+70-127 = 3.
(2)
Appala Naidu said:
6 years ago
Here rainfall is given in cm but actually it is in mm.
Then we can get an answer like.{(31-R) * 60}/40 = 3.
By this, we can get R = 2.9 cm ~3cm.
Then we can get an answer like.{(31-R) * 60}/40 = 3.
By this, we can get R = 2.9 cm ~3cm.
Brijesh said:
6 years ago
I think 5 is Right.
(1)
Yash said:
7 years ago
φindex=(P-R)/tr.
where, tr= rainfall time (10 minutes).
R= runoff.
P= storm time (total time = 60minute).
and φindex = 3 (given).
By converting mm to cm we will get the answer is 3.
where, tr= rainfall time (10 minutes).
R= runoff.
P= storm time (total time = 60minute).
and φindex = 3 (given).
By converting mm to cm we will get the answer is 3.
(1)
IRFAN said:
7 years ago
Thanks for the good explanation @Krunal.
Raaj said:
7 years ago
Thank you @Krunal, @Rajshekhar and @Shiva.
KRUNAL said:
7 years ago
From the graph, the upper part of φindex is called runoff and lower part is called infiltration.
Values are in min so we get convert its by divided by60 in hr.
Upper part s values are from the graph are 6, 10, 8, 7 for 10 min period.
R= (6-Πindex) *period/60 + (10-3) *10/60+ (8-3) *10/60+ (7-3) *10/60.
So we can get the answer 3.
Values are in min so we get convert its by divided by60 in hr.
Upper part s values are from the graph are 6, 10, 8, 7 for 10 min period.
R= (6-Πindex) *period/60 + (10-3) *10/60+ (8-3) *10/60+ (7-3) *10/60.
So we can get the answer 3.
(5)
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