b'16Monitoring of the runoff and sediment transport on arable fieldsplot and small catchment scalesJebek JJ1, Zumr DZ1 and Dostl TD11The Department of Landscape Water Conservation, Faculty of Civil Engineering, Czech Technical University in Prague, Prague, Czech RepublicSoil and catchment water balance, runoff processes, sediment and nutrients transport atagricultural areas are important to understand for proper management of the landscape.Nuice experimental catchment was established in 2012 in order to monitor hydrologicalprocesses at small headwater agricultural catchment. The catchment is located in the center of the Czech Republic, 30 km to the east from Prague. Agricultural land covers 96.4% of the 50 ha area of the catchment and it consists of three separated fields. Mean slope in the catchment is 3.8 %. Rainfall, discharge, suspended sediment, groundwater level, soil water regime andmeteorological variables for evapotranspiration calculation are monitored at the catchment outlet. Nuice catchment is drained by a small water course which is active during winter and wet periods during summer only. Low runoff coefficient (0.2 - 6 %) and relatively short conservation time (0.75 - 3 hours) together with slow ground water level response suggest that the shallow subsurface runoff plays an important role in the runoff generation. The shallow runoff hypothesis has been tested with plot scale artificial rainfallrunoff experiments. Such experiments aim to study how subsoil compaction, surface sealing and agro-technical operations affect runoff and soil erosion. Moreover the temporal variability of the topsoil characteristics as a result of therainfall kinetic energy and tillage operation has been studied. Results of both the long-termmeasurement and the artificial experiments are presented in this contribution. The long term monitoring and the experiments have been conducted within a frame of projectsGAR 17-33751L, LTC18030 and TJ01000270. 60'