This dataset contains:
(1) Results (excel file) of manual measurements of water discharge [m3/s1] (calculated from the handheld electromagnetic velocimeter), with the measured water depth and width at each crossection in 4 designated cross-sections at the Służewiecki Stream in Warsaw (downstream the tunel under Puławska street, done 12 times thorough the year 2025) - crossection 1 ("50 przed tama") coordinates: 52 10'05.9"N 21 01'10.7"E; crossection 2 ("30m przed tama") coordinates: 52 10'05.5"N 21 01'11.5"E; crossection 3 ("10m przed tama") coordinates: 52 10'05.2"N 21 01'12.5"E; crossection 4 ("10m za tama") coordinates: 52 10'05.5"N 21 01'11.5"E;
(2) Temporal changes of water level and temperature (every half hour in the first half of 2025 and then every 10 minutes for the rest of the year) recorded by a water pressure sensor (LeveLine) located 2 meters downstream crossection 3 ("Przed tama potok") and second, spare one, located upstream under the Puławska street. Data stored in tab files, for the correction additional file with barometer measurements;
(3) Plastic monitoring data - excel file and photographs from the monthly monitoring actions, including position of the found plastic item, type of plastic and description.