  The knowledge of the main features of the bulk flow in the Local Universe is
important for a better determination of the relative motions there, an
information that would contribute to a precise calculation of the
Hubble-Lema\^{\i}tre law at very low redshifts. We study how to obtain the
Hubble-Lema\^{\i}tre law in two sky regions using the catalog of HI sources of
the ALFALFA survey, with data $cz_{\odot} < 6000$ km/s. Our methodology aims to
compute $H_0$ in two regions -- located in opposite galactic hemispheres --
mapped by the ALFALFA survey, and look for dependence with distance, direction,
and also test for reference frame changes. We calculate the Hubble constant, in
the Cosmic Microwave Background reference frame, in opposite galactic
hemispheres: $H_0^N = 70.87 \pm 2.38$ and $H_0^S = 66.07 \pm 3.02$, which
allows us to measure the bulk flow velocity $V_{BF} = 401.06 \pm 150.55$ km/s
at the effective distance $31.3 \pm 6.26$ Mpc, a novel result found analysing
the ALFALFA data at low redshift. We confirm the influence of the bulk flow on
the structures of the Local Universe which manifests through a dipolar behavior
of the Hubble constant in opposite hemispheres.
