.- 
17 
73 
- 
46 
09 
Run 
28 
62 
- 
00 
88 
- 
2 
28 
mill 
00 
97 
1, in 
- 
00 
84 
do. 
00 
12 
do. 
00 
33 
do. 
00 
24 
do. 
00 
35 
81 [ 52 ] 
western branch. The summit level must draw its i-csoTirces from 
Deep Creek and the heads of tlic little and great Youghiogciiy. 
The.se streams Avere all gauged in 1824, at their lowest stage. V»'c 
will give, in a general r.ianner, the result of the^se operations: the 
miiiiiuum, in cubic feet of water, tliat iiows through each stream in a 
second. 
Eastern Branch oj the J^liddle Section. 
cub. ft. lOOths. 
Savage river gave, on the 28tli September, below the 
mouth of Ci'abtree Creek, in a second. 
Savage river gave, on the 28ti) Sept. at its mouth 
(It'had, however, rained this day.) 
Do. Do. 2d Sept. below Monroo Run 
Monroe Run gave, on the 28th Sept. at its mouth 
Do. Do. iGth Sept. do. 
Crahtree Creek gave, on the 14th Sept. at Swan's mill 
Middle Fork gaAC, on the loth Sept. at its mouth, in 
Crahtree Crei'k _ - _ _ 
Rock-Camp Run gave, on the 2d Sept. do. 
Savage-Lick Run 5;;ave, on the 14th Sept. do. 
Crabby 's arm gave, on the 17th August, do, 
Wilson's Fork gave, on the 1 7th August, do. 
If we consider, that the water consumed in the lockage of this 
branch is supplied from the summit level, tliese streams turned into 
reservoirs by dams thrown across the tributaries of Crahtree Creek 
an<i bi'.vage river, above the mouth of that creek, will serve to supply 
its losses from filtrations and evaporation. Between the mouth of Crab- 
tree Creek and the Potomac, on a distance of 5 1 miles, Savage river, 
Avhich gives 17.73 cubic feet, in a second, at its lowest stage, will 
serve for this purpose. In the remaining 9c miles from tlie tunnel to 
the n)oiith of Crahtree Creek, the middle fork gives 0.84 cubic 
feet; Rock Camp run 0.12 cubic feet; Savage Lick Run n.33 cubic 
feet; and Crabtree Creek itself, 0.97 cubic feet, at Swan's mill, at 
their lowest stages: total, 2.26 cubic feet. Reservoirs may, besides, 
be formed in the middle fork. Savage Lick Run, and Rock Camp Run. 
Filtrations may also be prevented, in a great degree, by a careful 
construction of the bed of the canal: and, from observations taken in 
the Summer of 1824, tlie loss from evaporation did not exceed the 
quantity received by Summer rains. It may also be observed, that 
any deficit will prove to be amply supplied by tlie waters of the sum- 
mit level. 
From the mouth of Savage river, the canal may be supplied from 
the north branch of the Potomac, which, on the 18th Septend>cr, gave 
106 cubic feet in a second; and a great reservoir may be formed in it 
above the mouth of Savage river. From this point, therefore, it needs 
no longer the waters of Savage river nor of its tributaries. 
And if we except the waters required for its lockage, which will be 
