Computation of Storage Capacity and Availability of Water in Irrigation Tanks Using Google Earth Engine

Abstract

AbstractStorage capacity of water bodies are useful for understanding the availability of water resources for the crop season in any Agriculture Watershed. Surface water bodies are the major source for Telangana State for the sustainable crop production. Estimation of surface water includes water spread area; volume of water stored in water body. The required reservoir water level and volume of water stored can be acquired from India-WRIS for Large Reservoirs and Dams. However, it is a big challenge to know Storage Capacity and Availability of water for most of the Small Irrigation Tanks which are the major source of water for Irrigation in Telangana State. In this study, an attempt is made to Compute Storage Capacity of Small Irrigation Tanks using Google Earth Engine. Google Earth Engine is a cloud computing platform through which geospatial analysis can be performed without downloading Satellite Data. SRTM (Shuttle Radar Topography Mission) DEM is used to estimate the Storage Capacity of Tanks along with Global Surface Water (GSW) Dataset covers the period 1984–2019. The maximum rainfall occurrence and maximum surface area is considered from GSW Dataset to Compute Storage Capacity of Tanks. Sentinel-1 Multispectral Satellite Data is useful to prepare NDWI Maps for Cloud-Free period. During storm months the optical far off detecting perceptions over semi-bone-dry Indian sub-landmass and deterred because of cover over. At this time Sentinel-1 Synthetic Aperture Radar (SAR) data is helpful to estimate the availability of water in surface water bodies. In this study, we have used both Sentinel-1 and Sentinel-2 satellite data to estimate the availability of water during Kharif Crop Season (June–September, 2020).KeywordsStorage capacity of irrigation tankWater availability in irrigation tanksGoogle earth engineSentinel satellite dataSRTM DEM