Runoff water chemistry

Aims give the amount of pollutants and other chemical components leaving the catchment through the stream together with results from the deposition programmes establish chemical input/output balances for the catchment Runoff water contains the main output of solutes from a catchment area. A runoff water gauge is installed in a small dam at the lowest part of the central stream. The output is calculated by continually measuring the runoff water volume at the discharge point and analysing the concentrations of chemicals in the water. Water is sampled twice a month for chemical analysis.   Variables normal year: pH, conductivity, Na, K, Ca, Mg, Al, Mn, Fe, NH4, NO3, SO4, Cl, HCO3, total N and total C, volume of discharged water campaign year additionally: Cu, Zn, Pb, Cd, Hg, methyl-Hg and labile Al

A so-called H Flume for recording runoff water. In winter freezing is prevented by insulation and gas-heated water broughtto the flume via the tube to the right. Strings in the trees frighten reindeers from trampling on the devices. (Gammtratten)