108. Design and report, evaporation reservoir, Rohwer and Parshall

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AMERICAN SOCIETY OF CIVIL ENGINEERS

SPECIAL COMMITTEE ON IRRIGATION HYDRAULICS

D. C. HENNY, CHAIRMAN J. C. STEVENS, SECRETARY B. A. ETCHEVERRY JULIAN HINDS ROBERT A. MONROE R. L.PARSHALL F,C.SCOBEY J, L. SAVAGE A. L. SONDEREGGER A-550 R. L. Parshall,

Fort Collins, Colorado.

Dea.r Parshall:

Spalding Building, Portland, Oregon,

January ~~ 1926.

I have looked over the deaign for your reservoir and

FRANKLIN THOMAS

think your estimate of oost ie too low. At leaat the unit prices are very low compared wi t.h wn.;:;..t e could do similar work here for.

According to our prices you could not buila the tank you

propose for much less than 2500.00. I doubt also if the tar bottom

will be effective. If the reservoir is emptied in the inter, frost

ill heave the bottom and. put i t out of commission.

Have you thought of M all lumber tank lined vii tb thin

galvanized iron sheets paint d inside ith petrolastic? e built

a good many wooden flumes that way that last for 15 to 20 years. In

your c~se the sill timbers would be in contact ith the soil and

would probably rot out in 5 or 6 years, but perhaps that i as long a.s you ould ant the trutk 8I1yway. I t e. longer life is desired use creosoted lumber.

I have made a rough estimate of the oost of such a reservoir, as follo

a

:

Excavation 625 cu. yda @ 40¢

Lumber 2x12, 1-1/2x6, end 4x6 rough, untr ated,

23,000 f.b.m. _ 40

Galv. iron lining 28 gauge painted with petrolastic

inside-

g

,

ooo

sq. ft. @ 8¢

Stillwella, pans, piping, etc.

Contingencie

Tottd

f250. 920.

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R. L. Parshall, Page 2 •. January 4, 1926.

The galvanized iron sheets are lapped about 1-1/2-inches.

Hot petrolastic is smeared on the lap between sheets and they are

~en nailed through into the 2-inch lumber with roofing nails about

1-1/4 inches long spaced every 2-inches. No expansion joints are

necessary. Ple.nking is spiked fast to the 4x6 sills with a 1/2-inoh

crack between them to allow for swell. Side posts to be set on sills

2 feet from the end and held by a heel-plate and also a diagonal brace.

The excavation then will have to be 104 feet in diameter. I would

not backfill against the side-wall but leave i t open for inspection

as to leakage.

After the metal lining is in place the whole inside is to

be heavily painted with hot petrolastic to prevent corrosion of the

metal and stop leak&ge.

1be principal difficulty with this type of construction will

be to make tight joints at the junction of sides and bottom. On this

account a square tank might. be considered. I think the results would

be just !l.S valuable.

Very truly yours, JCS/EC

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UNITED STATES DEPARTMENT OF AGRICULTURE

DIVISION OF AGRICULTURAL ENGINEERING

!:Ir. R. L. ParshaJ.l, Irrigation Engineer,

BUREAU OF PUBLIC ROADS

Colorado Agricultural Experiment Station, Fort Cbll ins, Cblo.

Dear Mr.

Parshall:-P. 0. BOX 180

POST OFFICE BUILDING BERKELEY, CALIFORNIA

February 4, 1926.

Your letter of December 29 attached to a descriptionof

an~plan for proposed evaporation tank, arrived in Berkeley

during my absence and became buried until the first of this week.

It seems to me that any tank used for your evaporation studies must be proven to be water-tight, that the results of the work may not be questioned. If, on the other hand, you have a tank that is leaking and you determine the amount of the lea.kage at any given time, that amount would undoubtedly change with a change of temperature as well as various other factors.

Even though you determined the amo'lmt of this leakage just before and ~ediately following a test, it would only be

par-tial evidence if the test extended over any material length of time.

It does not seem necessary to carry the measurement down to so fine a point as you are attempting - that is, a determination of the evaporation loss for half hour or hour periods.

You propose to line the walls of the tank with 20 gage galvanized iron. You may find you can use 24 gage to better advantage for the reason that it is relatively easy to make a water-tight cr~d joint but rather difficult with a heavier iron. You propose to omit the galvanized iron from the bottom of the tank, using tar in its place. I can see several ob

-jections to the use of tar, and only one or two advantages in its use. I am of the opinion that the use of tar is absolute

-ly out of the question for the reason that there are in all tars certain oils having specific gravity less than water, which therefore will float. The water may appear perfectly clear to the eye and still have on it a film of oil of minute thickness but, sufficient to change entirely the evaP.oration factor from

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R.L.1_).

-2-this tank. There is only one way to make tar permissible and that would be to bake it, thereby making a bakelite. My sug-gestion \rould be to line the entire tank with galvanized iron, using, if funds were at all procurable, concrete supporting walls and foundation. I believe the problem is of

suffici-ent impor~ance to warrant considerable expense in building a

sui table tank when this experiment shall again be taken up.

There is a further question in my mind as to the proper depth for your evaporation tank. If I recall correctly: the figures given by Charles H. Lee, the temperature changes of the water within reasonable limits are a relatively unfmportant

factor. You ma.y have given this question of depth sufficient consideration to be satisfied in your own mind that 30 ins. would suffice.

w.

Y. McLaughlin Associate Chief, Division of Agricultural Engineering.

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