Understanding and identifying pathways and processes affecting sediment, nutrient and faecal contaminant inputs from agricultural catchments to streams can improve environmental management strategies and provide a base for estimating the performance of various edge-of-field mitigations, such as riparian buffers and constructed wetlands. It can also provide estimates of the time lag between when changes in land use practices occur are implemented and when water quality effects that result from these changes are likely to be observed. The Hydrological flow Path Explorer is web based tool to characterise watersheds according to the major flow pathways: overland flow, shallow sub-surface flow, a mix of overland and shallow subsurface flows, or deep ground water flow. This tool was developed using publicly available spatial and temporal data for New Zealand, such as digital elevation maps, fundamental soil layers, rainfall maps, stream flow records and other physical characteristics of catchments. Hydrological Flow path Explorer help to visualize different flow pathways for all streams with Strahler 1st order and higher for New Zealand rivers. The flow pathway analysis results can support the development of recommendations for riparian buffer design. In this study, dominant flow pathways were defined by firstly applying flow separation based on observed flow at the outlet of the catchment using the methodology given in Singh et al. (2019) and secondly based on the HYPE hydrological modelling framework given in Srinivasan et al. (2020) and Singh et al. (2021). The Hydrological Flow path Explorer gives the contribution in % of total simulated at subcatchment outlet as SF is surface runoff; IF is interflow; Tile is tile drainge; SGF is shallow groundwater flow; DGF is deep groundwater flow for the River Environment Classification system (Snelder and Biggs, 2002) Strahler 1st order subcatchment boundaries. It also shows Base flow index (BFI) for the River Environment Classification system (Snelder and Biggs, 2002) Strahler 1st order subcatchment boundaries.

Singh, S.K., Pahlow, M., Booker, D.J., Shankar, U., Chamorro, A., 2019. Towards baseflow index characterisation at national scale in New Zealand. Journal of hydrology, 568: 646-657. DOI:https://doi.org/10.1016/j.jhydrol.2018.11.025

Singh, S. K., Pahlow, M., Goeller, B., Matheson, F., 2021. Data- and model-driven determination of flow pathways in the Piako catchment, New Zealand, Journal of Hydro-environment Research, Volume 37, 2021, Pages 82-94, https://doi.org/10.1016/j.jher.2021.06.004.

Snelder, T.H., Biggs, B.J.F., 2002. Multiscale River Environment Classification for water resources Managements. JAWRA Journal of the American Water Resources Association, 38(5): 1225-1239.

Srinivasan, M.S., Muirhead, R.W., Singh, S.K., Monaghan, R.M., Stenger, R., Close, M.E., Manderson, A., Drewry, J.J., Smith, L.C., Selbie, D., Hodson, R., 2020. Development of a national-scale framework to characterise transfers of N, P and Escherichia coli from land to water. New Zealand Journal of Agricultural Research: 1-28. DOI:10.1080/00288233.2020.1713822

For any query, please contact Dr. Shailesh Singh

[email protected]

03 343 8053_

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