New Ulm review., 1922-05-10
CALL FOR BIDS
FOR NEW WELL
Continued from page ~

AZ, Underlying the clty are three strata
of different composition and formations.
Immediately below the surface, the
formation consists of drift deposits.
It is necessary to go from Is to LOO
fee thru this before any water bearing
rock is encountered. Here it is found
in sand rock formation and is of a
sufficient flow to rise within 40 feet
of the surface when wells are sunk in
this sandstone. Investigation shows
that this sandstone formation with its
water supply is to be found chiefly.
near the ends of the high strip Of ground
upon which the city is located and the
report states that an abundant supply
of water might be obtained from the
region lying between the Cemetery
and the Fairgrounds. This water,
however, is.quite hard and is unsuita BILE
for use in boilers, for laundry and toilet
purposes.
The next water bearing formation is
apparently located some 200 to 800
feet below the surface. Between it
and the sandstone stratum described
above are beds of clay, shale, sand,
Ignite, etc. At about 800 feet, some
times less, is found a hard and thick
formation of granite. The water from
the formation just above the granite
is less hard than that obtained from
the upper layer of sandstone and is
therefore more satisfactory for general
use. It's quantity depends upon the
depth to which one can go before strik-
ing granite. When that is reached,
there is a limit to the possibilities and
the water supply will be abundant only
if the granite is at great depth from
the surface. t 81
. A study of the ground indicates that
the granite lies deeper at the north end
of the strip of land on which the city is
located than it does anywhere else.
At the south end of the strip the granite
comes much nearer the surface and
across the river it crops out right at
the surface. The best bet, therefore,
is that an abundant supply of water
can be secured by drilling in the north
end, as has been done before, and the
expert recommends that deep well be
sunk between Well No. A at 7th North
and Wells No. Land 2, at 1st North.
The plans he prepared provide for such
a well at about 3rd North and Spring.
It is true that the supply from Wells l
and 2 in the same neighborhood is
small, but they are comparatively
shallow and there is no record to show
that they even extend to the depth at
which granite is found, altho it has
always been supposed that they do.
The expert says that the new we'll
would not effect the flow from we'll No.
a because it will be about 1000 feet
away from that supply.
Advantages and disadvantages.
The report next discusses the adj
and disadvantages of drilling
a shallow we'll in the region of the
abundant supply between the ceme-
teries and the Fairgrounds and also
of putting down the deep we'll at 3rd
North. For the advantages of the
shallow well, he gives the com parative
small expense for drilling and pumping
equipment, as we'll as the lessened cost
of lifting the water from the we'll to.
the surface, the lift being shorter will
of course take less power. The dis
consist in the distance from
the present water supply, causing a
high expense for laying pipe such a
great distance and the hardness of the
water. The advantages of the deep we'll
consist in the fairly certain flow. of a
sufficient quantity, the nearer location
to the present pumping stations, re-
quiring less expense for the attention
required in keeping the station in run
ming order, and the softer water. The
disadvantages are summed up in the
greater cost of installation.
Capacity of the New Well.
It is estimated that we'll "a inches
in diameter, sunk down thru the sand
stone formation, practically to the
granite, will have a capacity of 800
gallons per minute. A well 50 inches
in diameter would have a capacity
of 400 gallons per minute and one 40
inches would yield 500 gallons per
minute. However, this would de-
pend upon the actual amount of water
to be had which is, of course, limited
by the amount contained in the for
nation. q: @ 5 4.
The Contract.
It is common practice to contract.
q we'll and pay for hole regardless
of the amount. of water it delivers.
This method, however, does not. work
out satisfactorily where the supply. Of
water needed is very great. It is not
q proposition Of simply finding some
one to dig hole, nor of how much the
hole is going to cost, but how much
will it produce. In the words of the
-. 8 4 u = e "a.