L 33 ] 9€ 
Ben's Creek comes in one mile below Lilly's mill, and the Littlf 
Conemaugh was found to deliver immediately below tlie jinictiora., 
11.640 feet— at Lilly's mill, 7.098 
Oil the east side of the mountain, Blair's Gap Run, 5.370 
j^^lprth Brook, 1.873 
5.243: 
Together M. 88 3 f. per second: 
The Commissioners had not yet had time and opportunity to inves-- 
tigate the value aud local relations of the other streams in this vicinij- 
ty, as they did at a later |^)criod. They state iiia letter to, the Board, 
of the 16th November last, that the Beaver Dam branch of the Juni-. 
atta, being surveyed, would afford the head waters of iJurgoon's Creek, 
dividing into Kitanniug Run, Old Gap Run, Siigai- Run, and Blair's 
Creek, draining the eastern side of tho ^Mleghany for ten or twelve 
miles. On the west side, the heads of the Little Conemaugh, com- 
posed of Trout Run, Laurel Run, ^^en's Creek, Limestone Ruu, 
Beard Rock Run, M'Closky's Run, and Laurel Deep Run, deriva-*. 
ble by feeders from the distance of fourteen miles, all of which the 
t'ommissioners state to be more thiinf(n:ty cubic feet per second; they 
silso describe favorable situations for reservoirs. , 
Perhaps no branch of practical civil engineering is involved in 
more difficulty than the calculation^ and construction of reservoirs 
and feeders. We have not, on this occasion, that intimate know- 
ledge of the local circumstances ourselves necessary to appreciate «>£ 
to doubt the persuasion which the commissioners express. While oi:v 
respect for them, as men of souni judgment, on the one hand, in- 
clines us to believe much may be done on this part of the section; ou 
the other hand, our recollection of the practical difficulties, occasions, 
a degree of doubt and hesitation to concur in the confidence they ex- 
press. 
The length of the tunnel requisite, and the elevation of the ground 
above the tide are sufficiently well ascertained; if the summit level, 
or tunnel, be below the level of Lill)''s mill, (and it will be of conse- 
quence as to the SHipply of water to place it low) its length will be 
1407 perches, and the line, it is found, will be above Frankstown 91Q 
feet. 
Frankstown, above Harrisburgh, - - , 576 feeto 
Harrisburgh, below the summit level, between Lancaster 
and Chester, ----- 209 
Thence to the side, - - - - - 519 
2214 
The commissioners also state that the descent to the fork of 
Conemaugh, is - - - - - 349 
And thence to Pittsburg, (759 above tide,) - - 688 
3251 fecta 
