def populate_zeta_grid(connection, grid_interval_mm):
    """Populate uniform grid on zeta

    """
    cursor = connection.cursor()
    cursor.execute("""
    INSERT INTO zeta_grid (grid_interval_mm) VALUES (?)
    """, (grid_interval_mm,))
    cursor.execute("""
    SELECT min(zeta_mm), max(zeta_mm)
    FROM water_level""")
    zeta_bounds = cursor.fetchone()
    cursor.executemany("""