Troy weekly news. (Troy, Idaho) 1897-1933, 1906-03-23


l P,Jte works for the Vsllage of Troy,
Idaho , Mouoh "A 1ooe
fp To- the Honorable Mayor and Village
Camel. Troy. Idaho.
Gentlemen Complying with your
,oouest to make survey ana furnish
ION report on the possibility OF piping
yyater by gravity system from the bello-
NV farm to town, giving you distances
alsvations and probable cost, submit
YOU the following;
From a proposed suitable reservoir
,;te about 500 feet south OF the old
Sr;ck ward, at an elevation OF 1851 ieet
hove Main Street, to the top OF the
AN of the ridge in the gap where the
sopd l. crosses, is 1872 feet. From said
, noirt on the ridge to the bIidge across
t y,a' creek near the Bellomy farmhouse
il 5000 feet 900
pronosed reservoir site above Main street i6S'd
ranf ri bridge above Main street -
VIE, w surface at br dye near Belongs 1907
Wafer surface 2OOO # up creek from brdg 2OS
II will therefore be seen that the ridge
.97.7 feet higher than the water at the
bridge; hence the ridge must be cut or
The water raised. The water in the
rack NAV be raised by a dam, or the
Sunply pipe extended up the creed suf-
6cient distance to overcome the III dit
ference in elevation mentioned. An al
lowance must be made for the slope OF
The pipe to carry the water.
The quantity of water to be used as
basis of estimate is derived as follows:
loo gallons in "a hours for each inhabi-
tant is the usual basis of estimate. If
l.. 4 co.. ho frrnxufh 0f the
town TO 100 population, the require
ment would be 10000 gallons in "a
hours, or SO gallons per minute .lo5
cubic feet per second). On this basis OF
supply ooo
5inch pipe must slope LAO feet per 1000
.6-inch pipe must slope 0.55 feet per 1000
OF these three sizes we will choose the
one that carries the given amount at
the least cost when installed. This in
cludes pipe, trenching, laying and back
filing.
Let us assume that cut
Of ten feet in the Saddle of the ridge is
allowable: then the lower end Of the g.
900 feet is an elevation 2l3.9 feet above
Main street. If six inch pipe be used
then in 5000 feet fall of 6 X 0 55 or 8.3
must be provided and elevation of water
surface at point of diversion must be
2I9.9 3.3 - Pip, or 81 feet higher
than the water at the bridge. | sug-
gest that, inasmuch asthe creek through
the Bellomy Meadow falls SO feet per
1000 you have a choice between raising
the water by a dam, or by extending
the pipe line up the creek to higher
level without the the dam, or by com
bination of partial extension Of line
and construction of a smaller dam. By
adopting a fifteen foot trench as the
maximum for few feet on the ridge
the length of pipe line may be reduced
about 1000 feet. The problem is one Of
comparative cost to attain the same re
suits.
Before submitting an estimate of cost
Of suitable gravity line may say thai
made survey around the hill to the
north and east of Troy, and such line
would require 5000 feet more pipe thar
a line through the saddle on the ridge
This far outweighs the cost of tunnellins
or extensions to save tunnelling.
Estimated cost Of proposed line
95U0 feet machine banded wood pipe
at $50 per foot laid .... .........., 352
700 II tu is II depth extra cost ........ 30
y dam earth 1000 cubic yds (g 10 CT. ~ ~
Gates; air valves etc....................... .
Engineering and superintendsnce. 70
lncldentals ......................-.. IL
4N Total. ............... . AL
This does not include right Of way
which will probably cost nothing, no
of lands whose intrinsic value is equa
to their cost.
The above estimate may be modltle'
to reduce the length of pipe by increas
ing the height of the dam; or boil
items reduced by increasing the cut il
the ridge. Neither change will materi
ally affect the total cost of this portion
OF the works. An extension of the pip
line 1000 feet to attain an increase G
5feet in elevation of intake would equa
the cost of raising the dam an extra
feet if desired.
Tunnelling through bridge: II
on examination by test pits or b.
means of an auger it develops that n
rock would be encountered at depth @
~ to % feet on the ridge, then the pip
line might be still further reduced /
length, diverting the water at poin
nearer the bridge calling for length {
gravity line about $500 feet in length
The estimated cost for such line woul
Nc as follows.
SSOO # Gin wood dipe at 35c per # laid $3.50
IVY ieet tunnelling add If no rock 81 pr II yOO
oioot dam 1000 Gu yards at l0c.......... 200
TGa.e We'll iron pipe creens.......'. %.
Gates air valve0 ACKNOWLEDGEMENTS. 90
engineering and superintendence. 10y
'"oluehtals. OBSERVATION-DISCLOSURES. lVV
Total 90, .... 49,. 300
Thus you will see that the saving on
shorter pipe line would be offset by cos
OF tunnelling and deeper trenching
approaches to tunnel.
Storage of supply:-In regard to q
storage of water for domestic nnrpos'
TO overcome any shortage in a dry SEES
son. wish to call your attention TO II
necessity of stripping any propose
reservoir site of all vegetable matte
and loan. leaving the basin free fro
organic matter. The site should
cposen with view to having the basi
as deep as possible. If it is desired
III maintain a 10 10 90 ,,o,I for hoofinOs ar