Guangzhou Water Conservancy Research Institute Office: 84446724 High-tech Room 34289217 Testing Room 84402652 Surveying and Mapping Room 34297769 Address: 11th Floor, No.557-563, Shougouling Road, Guangzhou Water Conservancy and Hydropower Survey and Design Institute, No.12, Lixiadao North, Qianjin Subgrade, Haizhu District, Guangzhou (Guangzhilv Building) Guangdong Water Conservancy and Electric Power Survey and Design Institute switchboard 38356800 Liwan switchboard.