Dear authors,

I am generally happy with the quality of the three reviews of this paper, as well as with the manner in which the authors have responded to them.

There are 6 technical corrections that in my view need to be made and that were not mentioned by the reviewers.

1. When mentioning the Atbara (p. 8, line 6; p. 14 line 33; p. 16 line 9), it is in my view better to give it the more appropriate name of Tekeze-Atbara or Tekezze-Atbara, in recognition of the name of the same river in Ethiopia from where it originates.

2. In Figure 3, the water fluxes are given the dimension of volume (m3); this should be volume per time unit.

3. Actually the water demand D, as well as the quantity allocated x, are also fluxes, and should be expressed in volume per time units, so Figures 1 and 2 should also be amended (both horizontal axes).

4. The same for the payments and transactions, these are quantities of money per time unit. So ENB, GB and E and FNB have as the correct unit money per time; so the correct unit for the amount $3 million mentioned on p. 12 lines 8, 10 and 23 is $3 million per year. The same for the amounts mentioned on p. 14 lines 22-24.

5. It would be advisable to use one symbol for US dollar (now the ms uses both $ and USD).

6. In figures 5, 6, 7 and 10, the border between Sudan and South Sudan is missing. This must be rectified.

Success,

Pieter van der Zaag

Dear authros,

Thanks for the revised version, which is acceptable subject to the following technical corrections:
- p. 1 line 4: the the -> the
- p. 15 line 29: the the -> the
- Figures 6,8,11: include the country name "South Sudan" in the maps

Kindly adjust and re-submit.

Pieter van der Zaag