Table 3 Monthly average Minimum In-stream Flow Requirement (MFR) calculation for the Jaraikela catchment, calculated based on the modified Tennant method, utilizing observed streamflow data and specifies flow thresholds as percentages of the Mean Annual Flow (MAF) rate.
Month | No. of days | Mean monthly flow volume for 1982–2023 (cumec.day) | MFR in the month (cumec.day) (for Good Habitat) | Flushing flows in the month (cumec.day) | Total MFR volume in the month (cumec.day) [\(=d+e+f\)] | Mean Streamflow Rate (SFR) (cumecs) [\(=c/b\)] | Mean MFR rate (cumecs) [\(=g/b\)] | |
|---|---|---|---|---|---|---|---|---|
In HFS @40% of MAF (= 124.02 cumecs) | In LFS @20% of MAF (= 124.02 cumecs) | |||||||
a | b | c | d | e | f | g | h | i |
January | 31 | 478.97 | 768.95 | 768.95 | 15.45 | 24.80 | ||
February | 28 | 332.39 | 694.53 | 694.53 | 11.87 | 24.80 | ||
March | 31 | 253.94 | 768.95 | 768.95 | 8.19 | 24.80 | ||
April | 30 | 143.72 | 744.14 | 744.14 | 4.79 | 24.80 | ||
May | 31 | 227.96 | 768.95 | 768.95 | 7.35 | 24.80 | ||
June | 30 | 3256.04 | 1488.28 | 1488.28 | 108.53 | 49.61 | ||
July | 31 | 9913.49 | 1537.89 | 1537.89 | 319.79 | 49.61 | ||
August | 31 | 13,491.78 | 1537.89 | 248.05 | 1785.94 | 435.22 | 57.61 | |
September | 30 | 10,806.74 | 1488.28 | 1488.28 | 360.22 | 49.61 | ||
October | 31 | 4358.82 | 1537.89 | 1537.89 | 140.61 | 49.61 | ||
November | 30 | 1361.41 | 744.14 | 744.14 | 45.38 | 24.80 | ||
December | 31 | 643.31 | 768.95 | 768.95 | 20.75 | 24.80 | ||
Total | 365 | 45,268.57 | ||||||
