Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1904-11-30
Measurements Much More Salts
factory Since Station Was
Transferred to Iowa City
A RATING TABLE ESTABLISHED
BY It the Flow Of tho Water in the
Channel Can Be Determined by the
Gage Reading - Would Produce
Maximum Gross Horse Power Of
$4,000.
Special to Times Republican.

DpGClul "
Washington, Nov. 3O.--IlvestIgations
concerning the flow and available wat
er supply and water power on the Iowa
river have been made by the survey
since October 90, 1902. The measure
ments made at Marshallown show a
variation in flow from 1850 to 1870 Gu
bic feet per second, and the gage
height varied during the period OF OBJ
servation from Ia feet to CTS feet
Since the station was transferred to
Iowa City the measurements made
have been much more satisfactory,
and the results which are set forth In
u recent report show clearly the power
and water supply facilities. The sta
ton at Iowa City was established June
II, 1908, at the two-sran highway
bridge at the foot Of Burlington street.
Tho gage. which Is road daily by Mr..
Arthur @. Smith, Of Iowa City, has
been established on the county bridge
directly west of the state university
grounds. Discharge measurements
are made on the upstrea n side OF the
Burlington street bridge. The report
states that the channel ct the river Is
318 feet wide between abutlnents and
the bed OF the stream Is OF soft material
except near the bridge pier.
One Of II 9 importan. tesults reached
by thu illv.st. atoms IL thu establish
ment Il u ratipg table by which the
flow # tse wytcr in this cll .nnel can
be detwur.l by the gaga reading.
This varies as follows: When the wa
ter level is 10 feet below the zero OF
the gage the channel csrries 1876 CUBIC
feet per second while when extralne
flood conditions prevail the gage read
Ing is at Is feet above the zero mark,
indicating that the river carries 90
900 cubic feet per second. A survey
Of the gage height records show that
during the period June, to December,
1908, there were foriy-seven days
during which the water level was be-
low the zero Of the gage, which indt-
Gates that during the number OF days
the amount of water flowing In the
channel and less than 500, cubic feet
per second. During the same period
there were 14S days during which the
gage height was between zero and
five feet; according to The rating table
the flow of the river during these days
varied between 500 and $3.50 cubic
feet per second. During seven days
from the LIST to the 7th Of June, the
gage read above ten feet. which shows
that more than 10000 cubic feet per
second were flowing In the channel.
The estimated average discharge Of
the river at Iowa City from June TO
October varied between 1926 cubic feet
per second on the month of June, and
4O3 cubic feet per second in Decem-
Der.
Based upon ter,-foot fall the
amount of water flowing In the stream
would produce maximum gross horse
power Of $4,000 and a minimum OF 40.
The Investigations Ut the geological
survey are being continued during the
present year, and 1t Is expected that
the work will be carr ed on for a SER
les of years until all extreme climatic
conditions have been determined, the
final results being series OF data
by which knowledge can be gained
Of the available power and water sup
ply afforded by the stream along Its
course. 4