Surface runoff characteristic (OAK)

The surface runoff characteristics (OAK) were specially developed for the implementation of the LUBW guideline "Municipal heavy rain risk management in Baden-Württemberg" and form the hydrological data basis for the hydraulic modelling of heavy rain hazard maps. For three different heavy rainfall scenarios, the OAKs indicate which part of the precipitation cannot be absorbed by the soil and thus comes to the runoff on the surface. Detailed information on OAKs can be found in Annex 3 to the above guide (https://www.lubw.baden-wuerttemberg.de/wasser/starkregenrisikomanagement).地表径流特征值（Surface Runoff Characteristics，简称OAK）系为落实LUBW指南《巴登-符腾堡州市政暴雨风险管理》专门研发，可为暴雨灾害图的水力建模提供水文数据基础。针对三类不同暴雨情景，OAK可表征降水中无法被土壤吸纳、最终形成地表径流的份额。有关OAK的详细信息可参阅上述指南的附件3（https://www.lubw.baden-wuerttemberg.de/wasser/starkregenrisikomanagement）。