watershed delineation for hydropower project

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Watershed delineation to propose Hydropower project

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  • Watershed delineation to propose a hydropower project in Shoghor-Chitral Aamir Zaman

    Aqeel Tariq

    Azeem Zafar

    Mudassar Sarwar

  • Content

    Introduction

    Objective

    Site description

    Methodology

    Recommendations

  • Study Area

    36.02.01N 71.33.20E

    Altitude 3700ft

    Shoghor-Chitral

    Mountainous area

    Chitral River

    Glaciers

    Energy source

    Kerosene oil till 80s

    1990 Micro Hydel Projects (AKRSP)

  • ObjectivePurpose of our analysis was to calculate watershed delineation to

    propose a suitable site for a hydropower project.

  • Requirements

    ArcGIS - Arc Hydro

    Data Elevation Model

    Satellite Imagery

    Physiography

    Regional Geological and Tectonic Setting

    Site Stratigraphic Information

  • General Geology

    Rock types

    Metamorphic Chitral Slate (Slates, Phyllite, Siltstone)

    Tectonically Less active

  • FLOW DIRECTION

    FILL

    DEM

    ACQUISITION OF POINT DATA

    Set up ARCGIS working environment

  • WATERSHED DELINEATION

    STREAM LINK

    STREAM NETWORK

    FLOW ACCUMULATION

  • Why we choose 10m DEM? 30m DEM generally flows

    within the valley but deviates from actual channel location.

    10m DEM produce much realistic flow paths that follow the channels.

  • Fill DEM

    The Fill sinks operation removes local depressions from a DEM by replacing these local depressions by flat areas in the output DEM.

  • Fill DEM

    Depressions that consist of a single pixel.

    Find a sink that consists of a single pixel (pixel in red).

    Assign to this pixel, the smallest value found among its 8 neighbor pixels (pixel in green).

  • Fill DEM

    Depressions that consist of multiple pixels.

    outlet for this depression is determined.

    the height values of this depression will be increased to the smallest height value of a pixel.

    that is adjacent to the outlet for this depression/sink, and that would contribute to the initial sink

    Pixels at the border of the map are never changed.

  • Fill DEM

  • Flow Direction

    focal function

    Flow direction operation determines into which neighboring pixel any water in a central pixel will flow. Flow direction is calculated for every

    central pixel in input blocks of 3 by 3 pixels, each time comparing the value of the central pixel with the value of its 8 neighboring pixels.

    The output map contains flow directions as N (to the North), NE (to the North East), etc.

  • Flow Accumulation

    The Flow accumulation operation determines the number of pixels that naturally drain into outlets.

    The output map contains cumulative hydrologic flow values that represent the number of input pixels which contribute any water to the outlets (or sinks if these have not been removed).

    Result of Flow accumulation. Result of Flow accumulation when Fill sinks is not used.

  • Stream Network

    Stream networks are delineated from a digital elevation model (DEM) using the output from the Flow Accumulation function.

    Flow accumulation in its simplest form is the number of upslope cells that flow into each cell.

  • Stream Link

    The Stream Link function allows you to assign unique values to each of the links in a raster linear network.

  • Watershed Delineation

    Flow direction and stream link are use to delineate watershed.

  • Recommendations

    Large amount of glacial water wasted.

    Area is also in Energy crises.

    Foundation conditions are favorable for construction of the hydropower projects

    Pouring point of whole area is in SHOGHOR.

    Hydro power potential of this river is modest but it can fulfill the needs of the locals.

  • Gracias!

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