Nitrate concentration in leachate water 2014-2016 (model result), 100 x 100 m grid NRW

Reference period 2014-2016, calculated by Forschungszentrum Jülich (as of 2018), The map of the nitrate concentration in the leachate water 2014-2016 is a calculation result of the RAUMIS-mGROWA-DENUZ-WEKU model chain as part of the co-ope-ration project GROWA+NRW2021. The result values included are the area-differentiated values of the relocable nitrogen content in the soil, the denitrifikati-on conditions of the soil, the usable field capacity of the effective root space based on the soil units of the BK50 (as of 2016) and the leachate rate calculated on the basis of the water balance model mGROWA. As an interim result, the dwell time in the soil was calculated from the water rate and the nFKWe. With the help of the reactive transport model DENUZ, based on the area-differentiated values of the reposable nitrogen content in the soil, the denitrification conditions of the soil and the dwell time of leachate in the soil, the nitrate degradation in the soil was calculated. In addition to the nitrogen discharge from the soil calculated from the difference between shiftable N-quantity in soil and nitrate degradation in the soil, N entries from small sewage treatment plants as well as from urban sources are added. The sum thus formed was subsequently converted into the nitrate concentration in leachate water by means of the leachate water rate and corresponding factors. The values shown in the map can be considered as a potential nitrate input concentration for groundwater, provided that groundwater is re-billed in the relevant area and nitrate degradation in the groundwater deck layers is unlikely. The corresponding nitrate freight is entered directly into the surface waters in areas with a predominant direct outflow content. A detailed description of the methodology shall include: LANUV (2021): Cooperation project GROWA+ NRW 2021 Part VII – Reduction of nitrogen inputs to achieve the targets for groundwater and marine protection. LANUV Expert Report 110, State Office for Nature, Environment and Consumer Protection North Rhine-Westphalia, Recklinghausen 2021. https://www.lanuv.nrw.de/fileadmin/lanuvpubl/3_fachberichte/30110h.pdf