REGISTRATION Deadline: March 22, 2021 Due to COVID-19, the 2021 meeting will be hosted online due to concerns for public health and safety. Registration is required to receive the webinar link! Registration FormFees & Deadlines Loading… The 41st Annual AGU Hydrology Days event will be hosted free of charge! However, registration is required to receive the webinar link and important event information regarding the event. Please be sure to register no later than March 22, 2021.