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Unit Hydrographs

Derivation of Geomorphological Instantaneous Unit Hydrographs for small catchments in hard rock regions - A research report by National Institute of Hydrology

In the study, the methodology developed at the National Institute of Hydrology to relate Clark model parameters to geomorphological characteristics has been used to develop unit hydrograph for two hard rock catchments, Barchi nala and Malaprabha up to Khanapur. This model has already been successfully implemented for simulation of flood events in small catchments of Upper Narmada and Kolar sub-basin of Narmada river as well as the Tapi sub-zone.Read More

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Derivation of GIUH for small catchments in hard rock region by NIH (1999-2000)1.18 MB

Location

Khanapur, KA, India
Latitude: 16.700000, Longitude: 77.016667

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Rainfall-runoff modeling of Morel catchment for design flood estimation – A research report by National Institute of Hydrology

In the present study, design flood estimation of Morel catchment of Rajasthan state is computed using the Synder approach, regional relationships as proposed by Central Water Commission, Clark's model, Soil Conservation Services (SCS) method and Geomorphological Instantaneous Unit Hydrograph (GIUH) based approach. Read More

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Rainfall-runoff modelling of Morel catchment for design flood estimation by NIH (1997-98)1.03 MB
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Flood estimation for large catchments using deterministic approach – A research report by National Institute of Hydrology

The report presents an interactive software that has been developed to not only provide design flood estimates for large as well as small sized catchments but also help the users analyse their historical rainfall-runoff records for calibration and validation of the various techniques for part or whole of the catchment and river reaches.Read More

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Flood estimation for large catchments using deterministic approach by NIH (1996-97)2.73 MB
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Rainfall-runoff modeling in Baitarni river upto Anandpur using HEC-1 model - A research report by National Institute of Hydrology

The study applies a hydraulic simulation model, Hydrologic Engineering Centre (HEC-1) to Baitarni river for modeling hourly flows of the river at Anandapur gauging site. HEC-1 model had been developed by US Army Corps of Engineers, for rainfall-runoff modeling. It provides a powerful automatic optimization technique for estimation of some of the parameters. The optimization technique of the model has been utilized in the present study and model parameters have been calibrated and validated for the study area.Read More

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Rainfall runoff modelling of Baitarani river basin upto Anandapura using HEC-1 by NIH (1998-99)427.2 KB

Location

Anandapur, OR, India
Latitude: 21.225561, Longitude: 86.111969

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Application of Geomorphological Instantaneous Unit Hydrograph and Geographical Information Systems based approach for flood estimation – A research report by National Institute of Hydrology

The study attempts to apply Geomorphological Instantaneous Unit Hydrograph (GIUH) and Geographical Information Systems (GIS) based approach for flood estimation. The design storm data of four catchments along with morphological characteristics have been considered. The geomorphological parameters and time area diagrams for each of the dam catchments were generated using the GIS package, Integrated Land and Water Information Systems (ILWIS).

The geomorphological parameters together with the time-area diagram forms an important input for the GIUH based Clark model. This model has been applied for deriving the instantaneous unit hydrograph and thereby to estimate the design flood in four dam catchments located in Luni and Chambal basins in Rajasthan viz. Jawai, Sei, Gamabhiri and Alnia. A review of the previous studies carried out using GIUH approach has been presented. Furthermore, a review of studies carried out using GIS techniques is also provided.Read More

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Application of GIUH and GIS based approach for design flood estimation by NIH (1998-99)3.95 MB
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Changes in land use and land cover and establishment of SCS runoff Curve Number in Suddagedda basin – A research report by National Institute of Hydrology

The study was taken up as a part of the representative basin studies being done by NIH and involved hydrological land use & land cover mapping for the Suddagedda basin of Andhra Pradesh. Mapping was carried out through visual interpretation for the years December 1987, April 1989, December 1992 and November 1996 using IRS IB-LISS II, LANDSAT 5-TM and IRS IC-LISS III data.

Land use and land cover are the most important surface characteristics of a basin. They are very dynamic features over space and time and it is difficult to get real time information on them through conventional means. Planners need to update knowledge of natural resources, which can be obtained quickly, economically and accurately through remote sensing techniques. Further, the land use map of a basin or region provides hydrologically significant categories, which are essential for estimation of reliable runoff from ungauged basins.Read More

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Representative basin studies: Changes in land use & land cover and establishment of SCS runoff curve number for Suddagedda Basin - AP by NIH (1998-99)742.87 KB
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Development of geomorphological instantaneous unit hydrograph for Myntdu Leska basin - A research report by the National Institute of Hydrology

The study attempts to develop a computerized model for Geomorphological Instantaneous Unit Hydrograph (GIUH) for estimation of flood hydrographs resulting from intermittent storms of varying intensity. The model applied to the rainfall-runoff data of the Myntdu-Leska basin of Meghalaya infers that the channel network and geomorphological features are closely related to the retention and discharge characteristics of the basin.

The theory of GIUH assumes that rainfall that occurs over a basin is assumed to be composed of infinite number of non-interacting drops of uniform size. After spending some time in one state in the channel or overland region, the drop makes transitions to another state to reach the basin outlet. Assuming one parameter, exponential time distribution of one drop chosen at random from the basin defines the IUH of the basin.Read More

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Development of geomorphological instantaneous unit hydrograph for Myntdu-Leska basin by NIH (1998-99)669.03 KB
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