This is the initial release of the SH-MoE-runoff code used in the manuscript: "Hydrology-Informed Mixture-of-Experts for Robust Runoff Prediction under Nonstationary and Human-Impacted Conditions" (submitted to Water Resources Research, 2025) This release includes: the SH-MoE core implementation (features, gating, experts, training, evaluation) minimal runnable examples demo input data under the Data/ directory documentation in the README This version is archived and preserved by Zenodo, and will be assigned a DOI automatically.