Water is essential for everyone. Every day we turn on our taps to fill glasses of water, make cups of tea, wash, cook and clean. We rely on water to run our schools, hospitals and businesses – not just ones we usually associate with water, like car washes and hairdressers, but every industry. It’s also essential for a healthy environment and a prosperous economy. Water companies are required to produce a Water Resources Management Plan (WRMP) every five years which sets out how the company intends to provide a secure and sustainable supply of water to their customers, whilst protecting the environment. Cohen, S., Wan, T., Islam, M. T. & Syvitski, J. P. M. Global river slope: A new geospatial dataset and global-scale analysis. Journal of Hydrology 563, 1057–1067 (2018). Our current Water Resources Management Plan 2019, which sets out how we plan to provide a secure and sustainable water supply for our customers Our WRMP24 Market Information data can also be viewed using Watersource, an online platform that we have jointly developed with Wheatley Solutions and Anglian Water. This is a new concept to provide access to key elements of the Market Information through a central ‘open’ cloud portal. Users can identify spatially those areas (Water Resource Zones) which have a supply surplus and those areas which have a supply deficit. The Watersource platform can be accessed at wheatleywatersource.co.uk

HydroSHEDS has been developed by the Conservation Science Program of World Wildlife Fund (WWF), in partnership with the USGS, the International Centre for Tropical Agriculture (CIAT), The Nature Conservancy (TNC), and the Center for Environmental Systems Research (CESR) of the University of Kassel, Germany. HydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. HydroSHEDS is based on SRTM DEM data. However, not all of the data has been completed and released, such as the river network is at 15 arc-second resolution 26. To ensure that the RN and the WRZ from L3 to L7 have a correct topological relationship, we set IN of each tributary and corresponding WRZ to be an odd number and IN of each main stream reaches and corresponding WRZ to be an even number. The IN of the last main stream connected to the outlet of each level of WRZ increases successively (Fig. 2b). The combined WRZ: The combined WRZ was defined as a region which contains several rivers flowing into the sea or lake, mainly small watersheds distributed in coastal areas, such as the east coast rivers in the South America. The rivers at L2, L3, and L4 levels in this combined WRZ are shown as follows (Fig. 3b). Our Water Resources Management Plan 2024 (WRMP24) builds on our current plan ( WRMP19) and reflects the South East regional plan. It sets out how we'll keep taps flowing for customers like you over the next 50 years, looking ahead to 2075.Verdin, K. L. & Verdin, J. P. A topological system for delineation and codification of the Earth’s river basins. Journal of Hydrology. 218(1-2), 1–12 (1999). The global L1 to L4 rivers obtained in this study are of high accuracy, compared with other data products, such as HydroSHEDS and HDMA river data. Compared with HydroSHEDS We have just submitted our Northumbrian Water and Essex & Suffolk Water draft Water Resources Management Plan 2024 (WRMP24) to Defra. A summary of our WRMP24 Best Value Plans is provided below. Northumbrian Water Under the WRX's hood is a turbocharged 2.4-liter flat-four-cylinder engine. Its 271 horsepower and 258 pound-feet of torque route through either a standard six-speed manual or a continuously variable automatic transmission (CVT). Per tradition, every WRX has all-wheel drive. Those who opt for the automatic, which can also be controlled via paddle shifters on the steering wheel, can also select from three different drive-mode settings. The auto-only GT trim also comes with adaptive dampers. A set of 17- or 18-inch wheels shod with summer performance tires are also available. We've driven the WRX and appreciated its smoother ride and improved refinement over the last generation. 0-60 MPH Times Arnold, J. G., Srinivasan, R., Muttiah, R. S. & Williams, J. R. Large area hydrologic modeling and assessment part I: model development 1. JAWRA Journal of the American Water Resources Association. 34(1), 73–89 (1998).

Verdin, K. L. Hydrologic Derivatives for Modeling and Analysis—A new global high-resolution database. US Geological Survey (2017). Understanding the impact of climate change on water resource across different regions is highly dependent on hydrological model and data 1. More accurate global river networks and catchment/sub-catchment boundaries are critical to more accurate water cycle simulation, water resource and risk assessments 2. With the undeniable impacts of climate change and human activities, the processes and fluxes of terrestrial water cycle have undergone tremendous changes, which has had significant impacts on extreme hydrological events such as droughts and floods 3, 4, and induced a series of eco-environmental effects 5, endangering the sustainable development of social economy and ecological environment 6. It can be seen that the construction of a complete set of global river networks and corresponding water resources zones (WRZ) has been highly valued by the international communities, government departments and academia. Meanwhile, it has become a hot issue in current research on hydrology, water resources and climate change. As the spatial resolution of the digital elevation model (DEM) improves, many hydrological data sets with high spatial resolution have appeared. In 2000, the Earth Resources Observation and Science (EROS) Center of the United States Geological Survey (USGS) developed a data set named HYDRO 1K 8, containing stream lines and basin boundaries based on the global 30 arc-seconds DEM (GTOPO30). The World Wildlife Fund (WWF) in association with the USGS, the International Centre for Tropical Agriculture (CIAT), the Nature Conservancy (TNC), the McGill University, the Australian National University, and the Center for Environmental Systems Research (CESR) have jointly developed the hydrological data and maps based on SHuttle Elevation Derivatives at multiple Scales (HydroSHEDS) 9 during 2006 to 2009. The spatial resolution ranges from 3 arc-seconds to 30 arc-seconds. It is superior to other similar data sets at that time and provides essential data support for enhancing river flow modeling 10. The HydroSHEDS v2, which improves upon the quality and limitations of HydroSHEDS v1, will be released in 2023. In 2017, the USGS developed the Hydrologic Derivatives for Modeling and Applications (HDMA) 11 database based on HydroSHEDS, Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010), and the Shuttle Radar Topography Mission (SRTM) 12 in cooperation with NASA Goddard Space Flight Center. Its spatial resolution ranges from 3 arc-seconds (for most of the globe south of 60° N) to 7.5 arc-seconds (for the areas north of 60°N). The spatial resolution of the hydrological data set improved again. In 2019, Yamazaki et al. developed a global hydrological dataset at 3 arc-seconds resolution (~90 m at the equator) named MERIT Hydro 13 based on MERIT DEM 14 and multiple inland water maps. It contains flow direction, flow accumulation, hydrologically adjusted elevations, and river channel width, which have been used in some recent river network studies 15, 16. HydroALTS 17, which is derived from the HydroSHEDS core product, correlates hierarchically nested sub-basins, as well as individual river reaches with hydro-environmental characteristics, providing 56 variables in 6 categories. At present, scholars and institutions around the world have developed numerous hydrological spatial databases at national, continental and global scales. For example, Seaber et al. constructed the hydrological unit maps of the United States in 1987, which was adopted and affirmed by the Federal Government of the United States and the United States Geological Survey (USGS) 7. In 1996, the Global River Network and Watershed Boundary Data Set (HRDRO 1 K), derived from the USGS’ 30 arc-second digital elevation model of the world (GTOPO30, about 1 km), has been produced by the EROS Data Center of the United States Geological Survey and the United Nations Environmental Program/Global Resources Information Database (UNEP/GRID) 8. From 2006 to 2008, the World Wildlife Fund (WWF), the USGS, the International Centre for Tropical Agriculture (CIAT), the Nature Conservancy (TNC) and Kassel University in Germany have produced a global hydrological data and maps-based (HydroSHEDS) at multiple scales, from the 90-meter resolution data (SRTM) 9. The “stream burning” method was employed to modify the surface elevation where only the large rivers and lakes located 10. Based on the HydroSHEDS data and hydraulic geometry equations, Andreadis in 2013 developed a simple near-global database of bankfull widths and depths of rivers 11. And Bernhard Lehner integrated and enhanced the HydroSHEDS with a new river network routing model (HydroROUT) 12. In 2017, the USGS has developed a new global high-resolution hydrologic derivative database, entitled Hydrologic Derivatives for Modeling and Analysis (HDMA) 13, based on HydroSHEDS, GMTED2010 (Global Multi-resolution Terrain Elevation Data 2010) and SRTM (Shuttle Radar Topography Mission) data. Huang, P. C. & Lee, K. T. Influence of topographic features and stream network structure on the spatial distribution of hydrological response. Journal of Hydrology. 603, 126856 (2021).Recent guidance from Ofwat required a partial update of the tables. We'll provide a full and comprehensive update at a later date. For Essex & Suffolk Water, our supply demand forecasts are significantly different to our WRMP19 forecasts because of: Essex & Suffolk Water has four Water Resource Zones, namely Essex, Blyth, Hartismere and Northern Central. Verdin, J. P. & Verdin, K. L. A topological system for delineation and codification of the Earth’s river basins. Journal of Hydrology 218, 1–12 (1999).