Scribd
Upload
65 views1 page

A.5 Long Term Stream Flow Analysis

The document provides equations to calculate stream flow at various exceedance probabilities (0%, 5%, 20%, 40%, 60%, 80%, 95%, 100%) based on total watershed area, area below 5000m elevation, and monsoon wetness index. It then shows a table of results, with the natural log of flow and flow in cubic meters per second for each exceedance probability.

Uploaded by

sandeep
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
65 views1 page

A.5 Long Term Stream Flow Analysis

The document provides equations to calculate stream flow at various exceedance probabilities (0%, 5%, 20%, 40%, 60%, 80%, 95%, 100%) based on total watershed area, area below 5000m elevation, and monsoon wetness index. It then shows a table of results, with the natural log of flow and flow in cubic meters per second for each exceedance probability.

Uploaded by

sandeep
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 1

A.

5 Long Term Stream Flow Analysis


A.5.1 Flow analysis from DFS Guidelines
Q % at 0%, 5%, 20%, 40%, 60%, 80%, 95% and 100% of exceedance should be calculated by
using total area (ATotal), area below 5000m (A5000A) and monsoon wetness index (MWI) by
using following equations:
InQ 0% = –3.5346 + 0.9398 . In (A 5000A +1) + 0.3739 . In (MWI)
InQ 5% = –3.4978 + 0.9814 . In (A 5000A +1) + 0.2670 . In (MWI)
InQ 20% = –5.4357 + 0.9824 . In (A Total) + 0.4408 . In (MWI)
InQ 40% = –5.9543 + 1.0070 . In (A Total) + 0.3231 . In (MWI)
InQ 60% = –6.4846 + 1.0004 . In (A Total) + 0.3016 . In (MWI)
InQ 80% = –4.8508 + 1.0375 . In (A 5000A +1) + 0.3739
InQ 95% = –5.4716 + 1.0776 . In (A 5000A +1) + 0.3739
√ Q100 %=−0.09892+ 0.08149 √ A(5000 A+1)
Table 41: Flow analysis as per Guidelines

Probability
of ln(Q) Q(m3/s)
excedence

0 6.1144 452.31
5 5.66 287.15
20 5.1506 172.54
40 4.3176 75.008
60 3.5891 36.201
80 3.1048 22.305
95 2.7771 16.072
100 3.0484 9.293

You might also like