Los Angeles herald., 1910-03-05

output of $4,000 kilowatts sustained by
these steady flow plants, the amount
of power required to accommodate the
variable demand throughout the day,
as indicated by the load curve above
referred to. must vary from nothing
to some 10000 kilowatts. This demand
taken in conjunction with the existing
heads at the two power sites In San
Francisquito canyon will require a flow
of water varying from nothing up to
1000 second feet, while at the same
time the total amount passed per day
must correspond to an average flow of
400 second feet as in other parts of
the aqueduct.
Id To provide for this variable flow
at these sites while at the same time
insuring the necessary continuous
daily average flow throughout the en-
tire length of the aqueduct provision
Is made for adequate storage reser-
yolrs above and below these sites The
function of these reservoirs will there
fore be to permit of the regulation of
supply in accordance with the demand,
while in addition they will have a ca
pacity sufficient to provide a guaran-
tee against interruption of service due
to accidents or repairs on the aqueduct
line between the Fairmont and Haiwee
reservoirs.
These arrangements will effectively
power output to demand and within
the capacities above stated should OBJ
viate the necessity Of any steam plant
either for relay or for carrying peak
loads.
Fifth-Value of power as developed:
The value of water power develop
ment depends, in general terms on two
main features:
(a) Regularity and reliability of serv-
ice, thus commencing the power to the
purchaser and thereby securing the
most favorable conditions of sale.
(b) Low first cost, and low costs of
operation and maintenance.
Among the conditions which bear on
the question of reliability the following
may be enumerated
No Side Hill Work
First-The general plans which are
under consideration contemplate the
utmost possible reliability in all con-
struetions relating to the hydraulic de-
Velopment. There will be no side hill
work involving risk to conduit by
slides. For all parts of the line under
pressure. the water will be carried
either in concrete lined tunnel or in
steel pressure pipe, and elsewhere in
concrete tunnel or conduit in accord
ance with the designs which have been
developed in connection with the gen
eral aqueduct project.
Second-A point of special impor-
tance is found in the diversion and
handling of the water along the line of
the aqueduct, entirely removed from
possible influence or interruption by
torrential streams Adequate storage
reservoirs will also insure a steady
flow throughout the year. thus elimin-
ating possible Interruptions or irregu-
larity of service due to an annual low
water period or to the vagaries of
stream flow In brief. the entire pro-
gram of water flow with reference to
power development will be under COM
pete control with reference to power
demand, and will possess the maximum
possible reliability and regularity
throughout the year. independent of
seasonable changes which exercise so
important an influence on the reliability
and regularity of service under the
usual conditions of hydraulic power
development.
Third-Special provision through the
appropriate combination of surge
chambers, relief valves and suitable
regulating devices will be made for
the safeguarding of all pressure lines
from undue shock due to variable We
locity Of flow.
Fourth-The subdivision of the pow
er development among seven or more |
pON0A HibCS AloALlbhNtu dlOlI5 liiC llllC |
Of the aqueduct and its feeders viii
permit of certain periods of overhaul |
and repair among the various plants |
without serious interruption in the de- !
livery of power at the terminal point |
in accordance with the demands of the |
daily load curve.
Fifth-As an aid in the prompt ex-
animation and overhaul of all power
units and of their gates and control |
valves special attention will he given
to the most effective location of shut |
off gates and by-passes.
SiXth-In regard to the transmission |
lines it should be said that climate, to-
Biography and accessibility for con.
struction, patrol and maintenance along |
the right Of way are more favorable !