DECIPHeR-GW version 1.0 is a coupled hydrological model with improved representation of surface-groundwater interactions. The DECIPHeR-GW model is built on the original DECIPHeR model (Coxon et al., 2019, DOI: https://doi.org/10.5194/gmd-12-2285-2019), DECIPHeR-MPR model (Lane et al., 2021, DOI: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020WR028393) and also a large-scale gridded groundwater model (Rahman et al., 2023, DOI: https://onlinelibrary.wiley.com/doi/10.1002/hyp.14849?af=R). Designed for computational efficiency, DECIPHeR-GW offers automated model building and is capable of large-scale hydrological simulations and predictions, including streamflow and groundwater levels. While the model has been tested using data from UK catchments, it is versatile and can be applied to other regions with adaptations tailored to specific hydrological conditions or data availability. If you have any questions regarding this code then please contact yanchen.zheng@bristol.ac.uk.