Development of Geomorphological Instantaneous Unit Hydrograph (GIUH) Model for a Watershed of Damodar Valley Corporation, Hazaribagh (Jharkhand), India

Author: Safi Hassan, R. Suresh and S.K. Nirala*

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Abstract

A GIUH model was developed using Nash (1959) and Rodriguez-Itrube (1982) methods to compute peak discharge (qpeak) and time to peak (tpeak). The model was calibrated and validated for five storm events, i.e. June 24 -25 (1992), October 12 -13 (1993), November 2-3(1993), June 28 (1994) and August 6 (1996) by comparing their ordinates with the ordinates of IUH The GIUH was tested with APE of the ordinate of peak discharge. On comparison, it was found that, most of the GIUH models over estimated the runoff at initial stage, while underestimated at the latter stage in comparison to the IUHs, which was mainly due to consideration of constant value of Φ-index, for computation of effective rainfall. The absolute prediction errors (A.P.E.) were computed to be 5.97, 18.09, 23.32, 9.64 and 7.52% of the ordinates of peak discharge for the storm events of June 24 -25 (1992), October 12 -13 (1993), November 2 -3 (1993), June 28 (1994) and August 6 (1996), respectively.

Keywords

Geomorphological characteristics, watershed, instantaneous unit hydrograph, geomorphological instantaneous unit hydrograph.

Conclusion

Instantaneous Unit Hydrograph was developed for six storms events of the Khuwatri watershed, which involve the computation of shape parameter (n) and scale parameter (K) based on observed rainfall-runoff database. The values of n and K for the selected storms were computed to be (1.12, 1.22), (2.97, 0.34), (2.82, 0.85), (3.39, 0.74), (1.02, 1.43) and (1.07, 1.57) for storms 1, 2, 3, 4, 5 and 6 respectively. The ordinates of IUH were computed at half hour interval because of small size of watershed. The comparison of GIUH model with storm IUH was performed by determining the Percentage Error (PE) and Absolute Prediction Error (APE) for the peak discharge (qp) and time to peak (tp). The Value of APE for qp and tp were found 25.35 % and 27.27 %, respectively.

References

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How to cite this article

Safi Hassan, R. Suresh and S.K. Nirala (2022). Development of Geomorphological Instantaneous Unit Hydrograph (GIUH) Model for a Watershed of Damodar Valley Corporation, Hazaribagh (Jharkhand), India. Biological Forum – An International Journal, 14(1): 9