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Development of Hydrological Response Units of Brahmani River Basin for Assessing Hydrological Responses Under Climate Ch

Project Location. Mapping of natural resources. Study Area - Brahmani BasinArea- 39313km2States- Jharkhand, Orissa and ChattishgarhNo. of Districts- 17Rainfall gauging station- 5Streamflow gauging station- 7. Toposheets of Brahmani river basin have been downloaded from USGS website (www.usgs.com)Each toposheet and thematic map has been georeferenced through GCP works of PCI Geomatica v9.1 with 0.5-1.0 RMS error.Total 9 toposheets of 1:250,000 scale have been mosaiced with the help of GCP 23

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Development of Hydrological Response Units of Brahmani River Basin for Assessing Hydrological Responses Under Climate Ch

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    1. Development of Hydrological Response Units of Brahmani River Basin for Assessing Hydrological Responses Under Climate Change Dr. Biplab Saha Principal Scientist ICAR Research Complex for Eastern Region ICAR Parisar, P.O. – B.V. College, Patna – 800 014 (Bihar) India

    3. Mapping of natural resources Study Area - Brahmani Basin Area- 39313km2 States- Jharkhand, Orissa and Chattishgarh No. of Districts- 17 Rainfall gauging station- 5 Streamflow gauging station- 7

    4. Toposheets of Brahmani river basin have been downloaded from USGS website (www.usgs.com) Each toposheet and thematic map has been georeferenced through GCP works of PCI Geomatica v9.1 with 0.5-1.0 RMS error. Total 9 toposheets of 1:250,000 scale have been mosaiced with the help of GCP works of PCI Geomatica to make a single mega image of the basin region. Catchment boundary of the river basin has been digitized from ImageWorks of PCI Geomatica with the help of contour lines, ridges and streams available on SOI Toposheet.

    5. Area of interest Bit map (mask) has been developed with catchment vector layer to extract area of interest from rectangular image window through image works of PCI Geomatica v9.1.

    6. Digital Elevation Model Contour lines with interval of 200ft. have been digitized through image works of PCI Geomatica v9.1 Unit of contour lines has been converted from “feet” to “metre” to make it usable in software for different processing with the help of Focus of PCI Geomatica. Digital Elevation model (DEM) has been developed through VDEMINT utility of XPace of PCI geomatica with the help of pre developed contour map.

    7. Sliced Elevation Map DEM layer has been sliced in to three ranges (1m-400m, 401m-800m and above 801m) through TNTmips with the help of imported DEM file to make it usable in overlay process.

    8. Aspect Map Aspect map has been developed with the help of ASP utility of XPace of PCI Geomatica which varies between 0°-360°

    9. Slope Percentage Map DEM layer has been imported to ILWIS 3.1 to generate slope percentage map which varies between 0%-222%.

    10. Soils of Bramhani basin Soil layer of six broad soil types, namely, silt loam, loam, sandy loam, clay, loamy sand and clay soil textures have been developed in GIS environment Major area (45.6%) is covered by Sandy loam followed by Clay loam (19.6%) and Loa my sand (18.6%) in the basin.

    11. Landuse of Bramhani Basin Four different landuse systems have been identified in the basin- Cultivated area, forest area, water bodies and habitats Cultivated area occupies major portion (70%) of the land cover and forest area occupies about 28% in the entire basin.

    12. Hydrological Response Units The DEM along with soil and land use layers are used for generation of spatially distributed hydrological response units (HRU) Total 19classes and 69HRU have been developed Highest area (11,786 km2) was found to be covered by class-14 with elevation class 400- 800m, sandy loam soil type and cultivated land use.

    13. Continued... Total 19classes and 69HRU (66HRU up to Jenapur sub-watershed) have been developed. Attributes and Statistics (minimum, maximum, mean, median, mode, Std. Deviation. etc. ) of each HRU have been calculated through overlaying the HRU vector to elevation, slope and aspect map with the help of vector utility of TNTmips.

    14. Sub-watersheds of the basin Five different sub-watersheds were delineated on the basis of drainage layers, stream flow gauging station as seed point using watershed menu of TNTmips 7.1 software The largest area is covered by Jenapur sub-watershed basin (14970.65km2) and the smallest area is covered by Mouth region (2631.50km2)

    15. Descriptions of elevation and slope of Brahmani basin and sub-watershed

    17. Descriptions of Soil type of Brahmani basin and sub-watershed

    19. Descriptions of Landuse classes of Brahmani basin and sub-watershed

    20. Descriptions of area under Brahmani basin and sub-watershed

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