a new study has identified gaps in data on streams around the world highlighting potential priorities for future installation of monitoring tools the analysis focused on stream gauges included in two global datasets including the large and widely used global streamflow indices and metadata archive a key source of information for hydrology research stream gauges are instruments that record the volume of water flowing through a specific location on a river or stream to assess whether certain types of waterways were overrepresented in these global gauging networks scientists combined data on the placement of over 32 000 gauges in the datasets with information on the characteristics of streams and their surrounding landscapes dr george allen assistant professor in the department of geography at texas a&m university co-led the research published today in nature sustainability stream gauges are located disproportionally in large perennial rivers draining more populated watersheds the study found gauges are sparsely distributed in protected areas and rivers characterized by non-perennial flow regimes both of which are critical to freshwater conservation and water security concerns as we respond to climate change and work toward conservation its important to recognize that the information we have from stream gauges is not completely representative said dr corey a krabbenhoft lead author of the study and research assistant professor at the university at buffalo the study was conducted by an interdisciplinary team led by krabbenhoft and primary authors allen dr peirong lin at peking university and dr julian d olden at the university of washington this study quantifies which river environments are most under-monitored by the global gauge network allen said we show where additional observations could have the greatest impact including observations from satellites for example the surface water and ocean topography (swot) satellite planned for launch in november 2022 will produce unprecedented observations of earths rivers swot and other earth observing satellites are an exciting path forward to help us fill in the gaps of the global river gauge network the datasets used do not include every stream gauge in the world gauges in regions that do not share data publicly will be missing along with data from streams that are monitored independently by organizations that do not integrate findings into public databases still the number of stream gauges covered in the study is large and comparable to the extent of datasets typically used in analyses of global hydrology research krabbenhoft said identifying biases in the placement of these gauges is vital as information from such datasets underpins important knowledge regarding the worlds freshwater resources this sort of data is the foundation for a lot of aquatic science data on where water is and what its doing and how its flowing is very fundamental krabbenhoft says one disparity we see is in the monitoring of non-perennial rivers which periodically dry up and stop flowing we need more data on these types of streams there are plenty of places across the world where we expect the number of streams that periodically go dry to increase in the future and in some cases these streams are part of larger river networks people rely on for their drinking water if the number of non-perennial streams increases in the future having a good understanding of how they function when they stop flowing and how long they stop flowing is critical information for being able to adjust water management priorities and understand how environmental change is impacting aquatic ecosystems worldwide the research was a product of the dry rivers research coordination network which was supported by funding from the us national science foundation to daniel c allen at penn state