This document describes Hydromodel Host, a cloud-based platform for smart water resources management. It provides real-time decision support and integrated tools for groundwater modeling, planning, management, and collaboration. Key features include automated model updating, running "what-if" scenarios, and providing visibility and predictability over groundwater resources. The solution addresses current issues like overexploited aquifers, contamination, and outdated technology. It allows assessing impacts of changes, extractions, recharge, and more through an easy-to-use web interface. Benefits include a single source of truth, cost savings, and keeping models as useful management tools. Use cases from Chile and Israel are highlighted.