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https://doi.org/10.11588/diglit.14059#0035
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Hocks in the NUe Valley, in Nubia.
L3
It will thus be seen that the velocity of the Nile is probably
greatly inferior to that of the Thames; for it appears that, except
during the inundation, for more than half the year the depth is incon-
siderable. The average fall when greatest, that is, including the pro-
vince of Batn-el-Had jar, where the rapids chiefly occur,is considerably
less than that of any part of the above course of the Thames ; so that
there must be long intervals between the rapids where the fall must
be far less than 13 inches in a mile. The breadth of the Nile is
vastly greater; but supposing the depth of the water to be the same
as that of the Thames, on account of the friction of the bed, the
greater breadth would add very little to the velocity. If we assume
the average depth of the Thames in the above distance to be 5 feet,
and that it flows with an average velocity of 2 miles in an hour, and
if we assume the average depth of the Nile in that part of its course
where the fall is 13T2 inches to be 10 feet, when not swollen by
the rise, the velocity would be 1\ mills
fall were equal to that of the Thames. =-
the truth, by assuming the velocity o — <-
miles in an hour. That it must be • E
divisions of the course I have named, ; ET^
mediately below the second cataract, w =_T
5-30 inches for a distance of 96 miles —
The power of a river to abrade the = *-
as water is by itself capable of doin E—
volume and velocity, and the degree H
acted upon. The power is increased wl:
to transport hard substances. But eve!
action on the rocks with which it com •
to move in running water, unless the 1
sequently, the velocity and force of th( •
are firmly set in moving ice, they then:
cutting and wearing down the rocks thj
but this condition never obtains in Lo'j
there. _
Geological Structure q>S5
One kind only of regularly stratifies
from Abu Hammed to Phila?; viz. a E"
that which occurs to a great extcn|
Upper Egypt, and which Russegger, a
of it there, considers to be an equivali
taceous rocks of Europe. The tert
abundant in Egypt, has not hither!
The NUe flows over this sandstom E
entiie distance, but not continuouslv, S
I stute this on thr* authority of'my trltmH
L3
It will thus be seen that the velocity of the Nile is probably
greatly inferior to that of the Thames; for it appears that, except
during the inundation, for more than half the year the depth is incon-
siderable. The average fall when greatest, that is, including the pro-
vince of Batn-el-Had jar, where the rapids chiefly occur,is considerably
less than that of any part of the above course of the Thames ; so that
there must be long intervals between the rapids where the fall must
be far less than 13 inches in a mile. The breadth of the Nile is
vastly greater; but supposing the depth of the water to be the same
as that of the Thames, on account of the friction of the bed, the
greater breadth would add very little to the velocity. If we assume
the average depth of the Thames in the above distance to be 5 feet,
and that it flows with an average velocity of 2 miles in an hour, and
if we assume the average depth of the Nile in that part of its course
where the fall is 13T2 inches to be 10 feet, when not swollen by
the rise, the velocity would be 1\ mills
fall were equal to that of the Thames. =-
the truth, by assuming the velocity o — <-
miles in an hour. That it must be • E
divisions of the course I have named, ; ET^
mediately below the second cataract, w =_T
5-30 inches for a distance of 96 miles —
The power of a river to abrade the = *-
as water is by itself capable of doin E—
volume and velocity, and the degree H
acted upon. The power is increased wl:
to transport hard substances. But eve!
action on the rocks with which it com •
to move in running water, unless the 1
sequently, the velocity and force of th( •
are firmly set in moving ice, they then:
cutting and wearing down the rocks thj
but this condition never obtains in Lo'j
there. _
Geological Structure q>S5
One kind only of regularly stratifies
from Abu Hammed to Phila?; viz. a E"
that which occurs to a great extcn|
Upper Egypt, and which Russegger, a
of it there, considers to be an equivali
taceous rocks of Europe. The tert
abundant in Egypt, has not hither!
The NUe flows over this sandstom E
entiie distance, but not continuouslv, S
I stute this on thr* authority of'my trltmH