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1

UNITED STATES

DEPARTMENT OF AGRICULTURE

SOIL CONSERVATION SERVICE

DIVISION OF IRRIGATION

Box 180

Berkeley, Calif. October 31, 1941 Mr. Carl Rohwer

Agricultural Experiment Station Colorado State College

Fort Collins, Colorado

Dear Mr. Rohwer:

I am addressing this letter to you instead of to Yr. Parshall in the belief that he is in the field and therefore unable to give the rntter immediate attention.

Inclosed is copy of October 28 letter from Mr. Frissell, together

with the mentioned galley proof of Farmers, Bulletin 1683,

"Measuring Water in Irrigation Channels."

The red pencil marks are Mr. Frissellts, black mAirks ours.

I suggest you go over the proof and if it is not necessary for Mr. Parshll to examine it, send it direct to Mr. Frissell without holding it for Er Parshallts attention.

c.c. Sydney Frissell Enclosures

eko1

/

4k.cAAAA1

Very truly yours,

t

W. W. McLaughlin, Chief, Division of Irrigation

Division of Irrigation, Fort Collins, Color%do,

July 29, 1941.

VIA AIR MAIL

Mr. A. T. Mitchelsou, Acting Chief, Division of Irrigation,

Soil 3onservition Service, Berkeley, California. Dear ?:,r. Mitchelsons

This is in rely to your letter of July 24 enclosing the carbon copy of the final draft of the revision of F4rmerst Bulletin 1683, "Measuring ater in Irrigation channels", as submitted to the ':ashinton office for publication.

I have checked through the report mther critically and find the text and arrangement most excellent. In this review I have noted only four minor corrections which should be mcie if there is still an opportunity, these are ha

followst

Table 2 - Rect,ngular eirs K= .48ft., 1..=6 feet. The discharm 6.53 should be 6.54.

Table 3 - Cipolletti weirs ki .54 ft., L3 ft. The discharge 3.95 should be 3.96.

Pag-.3 60 - Line 10 from the bottom, tiLl 1,ord "downstream" should be "upstream".

Caption Figure 2. Next to lst line, *see table 2" should be "s-3e table 5*.

In preparing the text of this revision, I followed

generally the plan of th,3 original publication. In the origina there was no summary, and I omitted this part in the revised text. The summhry, now a.)pended, is desirable and covers the

-2—

My ,,:eneral impression of thiE revision,

is one of bincers wopreciation for the tvlandid editing and fine arrangea.,ent of the subject matter.

The call for this type of information is more or less coniAant„ an since thio bulletin is more comprehen6ive than the former edition, I feel it will be a substantial contribution to the subject of mezi,urinc irrigation supplies.

!cum very truly,

R. L. Parsh:111„

UNITED STATES DEPARTMENT OF AGRICULTURE

aHRIEWEEZ _.7F-WG-WICULTEWr7---ENZINEERT

DIVISIOEUXIELIRRE

SOIL C:DNSLI<VATION SERVICE

Division of Irrigation

Mr. R. L. Parshall,

Agricultural Experiment Station, Colorado State College,

Fort Collins, Colorado.

222 POST OFFICE BUILDING BERKELEY, CALIF. MAIL ADDRESS: P. 0. BOX 180

July 24, 1941

Dear Mr. Parshall:

Herewith is carbon copy of revision of bulletin 1683, "Measuring Water in Irrigation Channels," as submitted to the

Washington office for publication on Nov. 6, 1940. We should

have sent you this copy sometime ago, but it was delayed on account of getting copies of the illustrations.

Enclosed is copy of a letter of July 12 which shows status of this publication.

Encs.

Very truly yours,

,de 4, •

-A. T. Mitche son, Acting-Chief, Division of Irrigation.