Assessment of Rainwater Harvesting Facilities Tank Size Based on a Daily Water Balance Model: The Case of Korea

Factors affecting rainwater resource management for the present and future include population growth, urbanization, climate change. Rainwater harvesting (RWH) allows multiple urban water-related issues to be mitigated. In this study, a spreadsheet-based daily water balance model was developed analyze existing laws regulations regarding storage tank size of RWH facilities. Six buildings at different locations were selected study. Two are office buildings, two school sports buildings. The term “RWH facility evaluation criteria” is collectively used supply satisfaction rate, guarantee utilization rate. A green roof can hold some time, reducing peak flow runoff volume. results provide evidence that, among studied having combination score highest in terms criteria, even though actual much smaller than standard size. This case with Yesan County Office, which connected small (66 m3) installed. As decrease volume, managed efficiently less pumping energy only tank.