STEPS:
- OPEN QGIS
- OPEN NEW PROJECT
- IN MENU TOOLBAR CLICK ON LAYER à ADD LAYER à ADD RASTER LAYER àBROWSE USING THE THREE DOTS à SELECT GEOTIFF FILE àCLICK ON OPEN à ADD à CLOSE
- IN MENU TOOLBAR à PLUGINS à MANAGE AND INSTALL PLUGINS àQUICKMAPSERVICES à INSTALL PLUGIN àCLOSE
- IN MENU TOOLBAR à WEB à OSM à OSM STANDARD
- RIGHT CLICK ON THE ADDED LAYER à CLICK ON PROPERTIES àINFORMATION
- CHECK THE PROJECTION SYSTEM
- IF PROJECTION SYSTEM IS NOT UTM OR ANY OTHER LOCAL PROJECTION SYSTEM (i.e. IF CRS IS GEOGRAPHIC AND UNIT IS IN DEGREES) THEN à IN MENU TOOLBAR CLICK ON RASTER àPROJECTIONS à WARP (REPROJECT) à IN TARGET CRS (OPTIONAL) CLICK ON THE BROWSE ICON à UNTICK NO CRS à IN FILTER SEARCH FOR WGS 84 UTM 45N (HERE 45N IS THE ZONE) àCLICK ON OK à RUN
- TO FIND THE THE UTM ZONE OF YOUR STUDY AREA à What UTM Zone am I in ? – Interactive Web Map (mangomap.com)
- IN STATUSBAR LEFT CLICK ON EPSG:4326 à UNTICK NO CRS à IN FILTER SEARCH FOR WGS 84 UTM 45N à CLICK ON APPLY àCLICK ON OK
- IN MENU TOOLBAR à PROCESSING à TOOLBOX à SEARCH FILL SINKS (WANG & LIU) àDOUBLE CLICK ON FILL SINKS (WANG & LIU) à IN DEM SELECT REPROJECTED àCLICK ON RUN à CLOSE
- IN PROCESSING TOOLBOX à SEARCH STRAHLER ORDER àDOUBLE CLICK ON STRAHLER ORDER à IN ELEVATION SELECT FILLED DEM àCLICK ON RUN à CLOSE
- IN MENU TOOLBAR à CLICK ON RASTER à RASTER CALCULATOR à IN RASTER BANDS DOUBLE CLICK ON STRAHLER ORDER@1 à IN OPERATORS SELECT >= àTHEN INPUT VALUE (FOR THIS CASE 6 ‘NOTE: THIS VALUE DEPENDS ON THE CLASSES OF YOUR STRAHLER ORDER’) à IN RESULT LAYER CLICK ON THE THREE DOTS IN OUTPUT LAYER GIVE A FILE NAME AND SAVE à CLICK ON OK
- IN LAYERS YOU WILL FIND YOUR SAVED FILE à RIGHT CLICK ON THAT àPROPERTIES à TRANSPERENCY à INPUT ‘0’ IN ADDITIONAL NO DATA VALUE
- IN PROCESING TOOLBOX SEARCH CHANNEL à DOUBLE CLICK ON CHANNEL NETWORK AND DRAINAGE BASINS à IN ELEVATION SELECT FILLED DEM à IN THRESOLD (INPUT THE VALUE USED IN RASTER CALCULATOR) FOR THIS CASE THRESOLD WILL BE 6 à UNTICK ALL THE OPEN OUTPUT FILE AFTER RUNNING ALGORITHM EXCEPT “CHANNELS” à RUN à CLOSE
- FIND THE COORDINATES OF THE POINT à IN MENU TOOLBAR àCLICK ON INFO ICON à IN PROCESSING TOOLBOX FIND BAND 1 IN IDENTIFY RESULTS
- IN PROCESSING TOOLBOX SEARCH UPSLOPE à DOUBLE CLICK ON UPSLOPE AREA àTARGET AREA WILL BE: FILLED DEM à COPY THE VALUE 1 AND 2 FROM THE IDENTIFY RESULTS AND PASTE IT IN TARGET X COORDINATE AND TARGET Y COORDINATE RESPECTIVELY à ELEVATION AS FILLED DEM àMETHOD AS [0] DETERMINISTIC 8 à RUN à CLOSE
- IN MENU TOOLBAR à RASTER à POLYGONIZE (RASTER TO VECTOR) àINPUT LAYER WILL BE: UPSLOPE AREA à RUN à CLOSE
- RIGHT CLICK ON VECTORIZED à OPEN ATTRIBUTE TABLE à CLICK ON TOGGLE EDITING àDELETE FEATURES WITH DN ‘0’ à SAVE EDITS
- IN PROCESING TOOLBOX SEARCH CHANNEL à DOUBLE CLICK ON CHANNEL NETWORK AND DRAINAGE BASINS à IN ELEVATION SELECT FILLED DEM à IN THRESOLD (INPUT THE VALUE USED IN RASTER CALCULATOR) FOR THIS CASE THRESOLD WILL BE 6 à UNTICK ALL THE OPEN OUTPUT FILE AFTER RUNNING ALGORITHM EXCEPT “CHANNELS” à RUN à CLOSE
- IN PROCESSING TOOLBOX à SEARCH POLYGON CLIPPING àDOUBLE CLICK ON POLYGON CLIPPING à SELECT VECTORIZED IN CLIP FEATURES AND CHANNELS IN INPUT FEATURES à IN OUTPUT FEATURES CLICK ON BROWSE AND SAVE FILE à RUN à CLOSE
- TO CREATE OUTLET POINT: IN MENU TOOLBAR CLICK ON LAYER à CREATE LAYER à NEW SHAPEFILE LAYER à GIVE FILENAME AS OUTLET, GEOMETRY TYPE: POINT, CHANGE CRS à CLICK ON OK à IN THE ADDED LAYERS à RIGHT CLICK ON OUTLET LAYER àTOGGLE EDITING à ON TOP IN DATA SOURCE MANAGER TOOLBAR àCLICK ON ADD POINT FEATURE à FIND THE LOCATION OF YOUR OUTLET POINT AND CLICK ON THAT LOCATION à SAVE LAYER EDITS
