On January 11-13 of this year, the experts of the TRANSWAT project (V. Akstinas, D. Jakimavičius and S. Nazarenko) did an expedition on discharge measurements in the tributaries of Ilgė Lake (Rokiškis District Municipality). Due to the prevailing humidity together with the intensive rainfall, the surface water bodies was significantly fed by surface runoff. Therefore, it was decided to perform hydrological measurements in order to evaluate how these conditions affected the water level of Ilgė Lake and the balance between the inflow and outflow tributaries.