National workshop on “Groundwater Challenges in India” Water Resource Development Plan for Chhokranala Watershed, District Raipur, Chhattisgarh, India, Using Remote Sensing and GIS Techniques By SHALINI CHOUBEY & DR. PRABHAT DIWAN Research Scholar Associate Professor Department of Applied Geology, National Institute of Technology Raipur. Outline of the Presentation Introduction Study Area Database And Methodology Result Conclusions Introduction Source-http://thenewsite.thewatershedproject.org A watershed is an area from which runoff resulting from precipitation flows past a single point into large stream, lakes or oceans. A watershed is a naturally occurring hydrologic unit characterized by a set of similar topographic, climate and physical condition. Study Area Total Geographic Area: 17.31 Sq.km. Longitude: 81°42’ to 81°45’E Latitude: 21°13’ to 21°23’N Chhokranala Watershed falls in the SOI Toposheet No. 64G/11,64G/12 and 64G/16. Annual Rainfall of the area is 1200mm. Altitude of the watershed varies from 290m to 310m above MSL. Database And Methodology Watershed Boundary Therefore, it is decide to delineate watershed at various levels of hierarchy based on drainage network, contour configuration and elevation. The size of watershed is dependent on the size of the stream, river, the point of interception of stream or river, the drainage density and its distribution etc. Delineation is part of the process known as watershed segmentation, i.e., dividing the watershed into discrete land and channel segments to analyze watershed behaviour. Watershed Map of Study Area GEOLOGICAL MAP Geology map has been prepared from the Satellite Data and District Resource Map. The map was corrected after using the geological map of Geological Survey of India with help of ArcGIS Geology of the study area as shown in Geology Map. Geology map of Study Area GEOMORPHOLOGY MAP Geomorphology map has been prepared from the Satellite Data and District Resource Map. The map was corrected using the toposheet of Survey of India with help of ArcGIS. Geomorphology of the study area is shown in Geomorphology Map. Geomorphology Map of Study Area. SLOPE MAP In the present study, Aster DEM was used to prepare slope map. The slope grid is identified as the maximum rate of change. Using the method from each cell in the value of its neighbour’s described in the Burrough (1986). Chhokranala watershed slope varies from 0 to 5% which is very gentle. Slope map of Study Area SOIL MAP Mainly two soil categories are present in Study Area Ultisol Vertisols. Soil map of Study Area LAND USE LAND COVER MAP The major land use/ land cover categories identified in the study area Settalment, Double Crop, kharif Crop/ Rabi Crop, Land with scrub/land without scrub, water bodies. Crop land identified in the study area was mainly large area its mostly showing 40%. Settlement area was observed mainly in 20% and the waste land is categories in scrub and without scrub land. The total waste land which was 30% of the area. The water body category only interpreted as form of Tanks/ Ponds and reservoirs. The water body in the study area is 10%. With help of satellite data and ground truth, map prepared on ArcGIS LULC Map of Study Area Depth of Water Level Map of Pre And Post-Monsoon Pre Monsoon Ground Water Depth Map Post Monsoon Ground Water Depth Map LINEAMENT MAP In all 13 lineaments have been identified and marked in the area. They are having varying dimension and areal extents as well. Satellite image Landsat 8 ETM+ and a digital elevation model (DEM) were obtained to conduct a lineament analysis with the help of ArcGIS Map as shown below. Lineament Map of Study Area DRAINAGE AND WATER BODIES MAP Drainage and Water Bodies map has been prepared from Toposheet. The map was corrected after using the Satellite and Field check with help of ArcGIS. Drainage and Water Bodies of the study area as shown in Drainage and Water Bodies Map. Stream Orders & Water Bodies Map of Study Area Result A systematic integration of these data with follow-up of hydrogeological investigation provides rapid and cost-effective delineation of groundwater potential zones The groundwater potential zones were obtained by overlaying all the thematic maps in terms of weighted overlay methods using the spatial analysis tool in ArcGIS. During the weighted overlay analysis, the ranking has been given for each individual parameter of each thematic map and the weightage were assigned according to the influence of the different parameters and was presented in Table CRITERIA FACTORS CATEGORY (CLASSES) POTENTIALITY FOR GROUND WATER STORAGE RATING OVERALL WEIGHT Geomorphology Alluvium Pediplain Surface Pediplain Moderately Weathered Very good Good 5 4 4 Geology Pediplain Shallow Weathered Pediments Laterite Ferruginous Gluoconite Arenite and Shale. Poor Very poor Good Poor 2 1 4 2 8 Limestone and Dolomite with Shale and Sand Stone 0-50 Meter 50-100 Meter 100-150 Meter Double Crop Kharif Crop/Rabi Crop Waterbodies Land with scrub Land without scrub Settlement 0-1% 1-3% 3-5% 1st 2nd 3rd 4th Vertisol Ultisols Sandy soil 3.00-6.00m 6.00-9.00m 9.00-12.00m 12.00-18.00m Poor 2 Very good Good Moderate Very Good Good Very good Poor Poor Very poor Very good Good Poor Poor Moderate Good Very Good Poor Good Good Very Good Good Moderate Poor 5 4 3 5 4 5 2 2 1 5 4 2 2 3 4 5 2 4 4 5 4 3 2 Lineament Buffer Landuse/Landcover Slope Drainage order Soil Groundwater level depth 7 6 4 6 7 5 Integration of Remote Sensing and GIS modelling for groundwater potential zone mapping The eight parameters considered are: Geology, Slope, Soil, Geomorphology, Land use/ Land Cover, Lineament, Drainage and Water level Depth . Every class in the thematic layers was placed into one of the following categories viz. (i) Very Good ,(ii) Good, (iii) Moderate, (iv) Poor, (v) Very Poor, depending on their level of groundwater potential. Ground Water Potential Map of Study Area Proposed Water Conservation Structures S. No Proposed structures No. of structures 1 Boulder Dams 21 2 Gabbian Dams 20 3 Check Dams 15 4 Percolation Dams 16 5 Nala Pluggings 6 6 Injunction Wells 15 7 Farm Ponds 25 Proposed Recharge Structure Map of Study Area Conclusions This study has established methodology for demarcation of zones suitable for artificial recharge structure. Here Study area is divided into Five groundwater potential zones (Very High, High, Moderate and Low, Very Low).We have suggested the suitable structures for proper exploitation of groundwater. From GIS modelling it revealed that artificial structures viz. percolation tanks, check dams, Recharge-cum-discharge wells are feasible in the area. Roof top rain water harvesting structure is most feasible technique in an industrial area. Check dams can be constructed across 3rd and 4th ordered streams having gentle slope and are feasible in an area of shales and limestone with shallow and deep pediplain. Boulder dams are most suitable recharge structure in the SE part of the watershed and having geomorphic feature like pediments and pediplain shallow weathered . All the water that will ever be is, right now. -National Geographic Water has become a highly precious resource. There are some places where a barrel of water costs more than a barrel of oil. - Lloyd Axworthy