Improvement of Observation Accuracy of Rainfall Information System: Tokyo Amesh

Bureau of Sewerage Tokyo Metropolitan Government operates a rainfall information system, “Tokyo Amesh” to rapidly obtain information of rainfall such as localized thunder storm and heavy rain to make the operation of pumping stations and water reclamation centers more efficiently. Due to deterioration of main components such as rain radars and central processing unit after more than ten years of operation, Bureau of Sewerage, Tokyo Metropolitan Government completed the system reconstruction of Tokyo Amesh between FY2012 and the end of FY2015.In the reconstruction, we replaced old radars with new radars which can obtain data of additional meteorological parameters to ensure reliability of the information. We worked at improving observation precision including installing X-band Multi Parameter (MP) radars with both horizontal and vertical polarimetric waves to improve observation precision. We continue to address challenges such as Bright Band for further improving observation precision.