KBS-RWQ show how best to classify rivers and embark on necessary strategic decisions. Load duration curve has been identified as one of the assessment tool that offers a practical approach to watershed management. The assessment of water quality was based on pollutant loading model establishing the load capacity of the river to determine specific limit for the river in receiving pollutant. The case study demonstrates the system capability in assessment of water quality using LC, important assessment in analyzing individual parameter to the receiving capacity of the river based on the beneficial uses of the water quality. This book will provides new software in knowledge- based expert system in river water quality. The practitioners should gain the benefit of formulating appropriate strategies and policy with the aid of KBS-RWQ software developed. KBS-RWQ is very useful tool to professional in water and water related fields such as scientist, managers/decision maker, water operators, reservoir engineer, hydrologist, community-base associations, IT/programmer or anyone who may need tools for assessing and evaluating water quality.