iWASAM (intelligent Water Allocation Scheduling And Monitoring system) is developed as a tool for water management of Klong Suan Mak (KSM) River Basin, one of the sub-basins of Lower Ping River Basin, Northern Thailand, with the area of 1,213 square kilometers. iWASAM system is driven by hardware, software and user interaction for importing cultivation-related data and uses all of them to estimate irrigation water requirements, target water delivery to the irrigation areas and finally to analyze irrigation efficiency and performance of water management practices.

Hardware devices comprise IoT based weather stations and flow measurement stations. Temperature, relative humidity, wind speed, solar radiation and rainfall, considered as weather data, are collected every 5 minutes. On the other hand, flow rates at some diversion weirs in KSM main channel, at broad-crested weirs installed downstream of some canal head regulators and the reservoir outlet are collected every 15 minutes. iWASAM system can be accessed through the web application. While crop growth data (Kc) from IrriSAT API (Weather Based Irrigation Scheduling Service) and daily weather forecast data for the selected areas from TMD Weather Forecast API of Thai Meteorological Department are retrieved into the system daily, the actual data of crop cultivation areas, crop yields and prices in each season are input by the staff of Water Master 1 (Kamphaeng Phet Irrigation Project). All the data are processed to get the estimation of daily irrigation water requirements and target water delivery of the selected irrigation area. Finally, irrigation efficiency and performance of water management are evaluated and reported seasonally.