462. Foxboro report

(1)

117

31419Re Mil Y. • nstrumenialion

THE FOXBORO COMPANY

FOXBORO,

MASS., U.

S.

A.

CONTENTS: MERCHANDISE-FOURTH CLASS MAIL

POSTMASTER: THIS PARCEL MAY BE OPENED FOR POSTAL INSPECTION IF NECESSARY. RETURN POSTAGE GUARANTEED.

(2)

OXBORO

HE u PAT oFr

nsirurnen/s

71-114, FOX130R0 COMPANY

_FOXB OR 0 • MASSACHUSETTS • U • S • A • CABLE ADDRESS • FOX.0 0 FOXBORO

July 20, 1948

Mr. R. L. Parshall

U. S. Department of Agriculture Soil Conservation Service

Division of Irrigation Fort Collins, Colorado Dear Mr. Parshall:

Thank you for your letter of July 14 covering the questions in mine of July 2. It is obvious from the numerical example on Page

4

of your letter that my question regarding the effect of rounded crest edge results from the ambiguity of the term "overregister". We had considered this to mean that the recorder would register more water than was actually

flowing over the weir, whereas apparently the meaning is exactly the reverse. To eliminate the possibility of mis-understanding on this score, we have changed the wording as follows - "rounding of the crest will cause the meter to readl less than the actual flow".

We still have some questions regarding the triangular weir. Whereas this type of weir probably does not have much application in irrigation work, it is extremely important for Industrial applications. We have found a considerable appli-cation for weirs in the measurement of salt water in the oil fields. Salt water is produced with oil in certain regions, and since state conservation departments will not permit

dumping it into waterways, its disposal becomes a considerable problem. Many of the weirs which we have found it necessary to use, in order to obtain heads high enough to register on our recorder, have had to be notches of less than 28 degrees. It is possible that extrapolation of existing data on these narrow notches does not give a strictly accurate result, but so far the results have been entirely satisfactory to the customers and the measurements probably more accurate over a period of time than could be obtained with other forms of meters. Perhaps we should be using Parshall flumes on these applications, and we shall give consideration to this possi-bility in the future. However, we should like to establish some reasonable design specifications for weir boxes with

(3)

THE FOXBORO COMPANY

SHEET 2

TO Mr. R. L. Parshall' DATE July 20, 1948

these narrow notches. You can readily understand that specifi-cations based on the requirements for a rectangular weir, using the maximum head as the criterion for the weir box dimensions results in an unreasonable and highly expensive installation. A limitation based on area ratio would answer this objection very nicely, but would it be adequate? We note that the ASME Fluid Meters report specifies that the width of the channel be at least three times the width of the notch in order to prevent side wall friction effects. Do you think that it would be a safe recom-mendation, if, in addition to the area ratio limitation of 10 or 12 to 1, we addedafurther limitation that the width of the weir box should be at least three times the width of the notch at maximum head?

We have rearranged the copy in an attempt to present the information more or less in the order in which it is required. We have added a sentence or two taken from the ASME Fluid Meters report, but in general, the text is merely a rearranged copy of

your notes intended to be published under your name. Will you please check it over carefully making any changes, corrections, deletionz, or additions that you consider desirable. We wish you to have this in exactly the form in which you should like to have it published. It is desirable, however, to have the

references sufficiently general so they may be applied to indus-trial applications as well as to irrigation, inasmuch as the former will constitute a large portion of our field of use.

We greatly appreciate your continued co-operation.

Yours very truly, THE FOXBORO COMPANY

g

L. K. Spink

LKS:IM

(4)

.11 PXBORO insirumenis

FOXPORO COMPANY

FOXBOJ-?0 • MASSACHUSETTS • U • S • A•

August 5, 1948

Mr. R. L. Parshall

U. S. Department of Agriculture

Soil Conservation Service

Division of Irrigation

Fort Collins, Colorado

Dear Mr. Parshall:

The enclosed sheets supplement the copy

recently sent you on Weirs & Flumes. The table of

dimensions will be used with a schematic composite

drawing. We are eliminating structural details on

this drawing, in order to make the dimensions more

easily decipherable and to make the drawing applicable

to any material of construction.

You will note that we are changing the

di-mension W of the Parshall Flume to L. This is because

the dimension W appears in the formula and conflicts

with the symbol used for rate of flow in weight units

elsewhere in the book.

Likewise the term "S" for slope of the

triangular notch interferes with other terminology.

Hence, we substituted tan

e.

7 Because of manufacturing considerations, it

is highly desirable in recording instruments to use a

formula which will permit use of the same cam for

different weir dimensions. We have, therefore, where

such formulae are in common use, included them.

Please do not hesitate to make any changes

you consider advisable in my interpretation of your

text, either in this or the la previous communication.

Yours very truly,

THE FOXBORO COMPANY

L. K. Spink (?)?)

LKS:IM

(5)

Division of Irrigation Fort Collins* Colorado

August 9* 1948

Mr. L. K. Spink Foxboro Company

Foxboro, Maseaohusetts Dear Mr. 3pink:

I have your letter enclosing the proposed tests for your hand-book and also your letter of the 5th concerning weir discharge formulas.

With reference to your former letter and knowing your need for a discharge through a 1-4 slope notch weir, I have spent a week or more building apparatus and making testa for heads ranging from 0.1 to 0.2 on this particular type of notch at a head of 0.1 discharge* in the order of 0.0023 moond*feet, and for a

head of 1.2 feet the disoharge is 1.0 second-tot.

It will take me a couple of days to fully analyse the results of my observations at the laboratory, but believe that the equation throughout this range should

'it

the data very closely and may I say further that I will endeavor to clean up all of your questions in the next day or so and will, of course, give you the complete discharge for the 1-4 slope notch

Very truly yours*

R. L. Parshall Collaborator RLP/bjt

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PXBORO insirumenis

THE

_{FOX130R0 COMPANY}

FOXB OR 0 • MASSACHUSETTS • U • S • A • CABLE ADDRESS • .FOX.0 0 FOXE3 OR. 0

August 16, 1948

Mr. R. L. Parshall

U. S. Department of Agriculture Soil Conservation Service

Division of Irrigation Fort Collins, Colorado Dear Mr. Parshall:

Many thanks for your letter of August 9. The work you are doing on the 1-4 slope weir will be extremely valuable.

I am sending more copy and drawings for you to check. The curves are merely for quickly checking the size of weir or flume required for a certain capacity so don't require a high degree of accuracy.

I have turned enough copy over to the printer to hold him a few weeks, but am holding up the section on measurement in open channels until you have time to put this section into shape that you approve. If you prefer, merely use my copy for order of presentation and rewrite the entire section in your own words.

L. _{K. sPinic ()in}

LKS:IM Enc.

(13)

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PXBORO insirumenis

THE

FOXI-30R0 COMPANY

FOXBORO • MASSACHUSETTS • U • S • A•

September 28, 1948

Mr. R. L. Parshall

Senior Irrigation Engineer U. S. Dept. of Agricultrue Division of Irrigation Fort Collins, Colorado Dear Mr. Parshall:

Many thanks for your prompt reply to my letter of September 21. The marginal notations are a quite satisfactory form of reply and save a lot of time.

One other question arises in connection with the curves. The curves for weirs extend in some cases to an Ha dimension greater than the height of the weir box. Leupold & Stevens carry their tables for rec-tangular anc Cipolletti weirs to a

3

ft. head and the triangular to 2 ft. We do not want to restrict the data unnecessarily; neither do we want to encourage un-sound engineering practice.

Do you consider the maximum heads listed in your table to be as high as it is safe to operate? If higher operating heads are feasible, wouldn't it be advisable to add a footnote stating that for heads and flow rates above the limits listed in the table, the height of the box should be increased sufficiently to allow

6"

free board above the maximum head and the width should be increased sufficiently to provide an approach channel area equal to 10 times the maximum submerged area of the notch?

The table of dimensions on the 10 ft. and larger flumes does not list an E dimension. Do you have a table on the larger flumes comparable with the

(17)

110XBORO Ins7;;;;enis

THE

FOXI-30R0 COMPANY

FOXBORO • MASSAC.HUSETTS • U • S •

A-

-2-one which you supplied on the

3" to 8

ft. flumes?

L. K. Spink LKS:IM

P.S. The sketch enclosed with your letter and the drawing in Farmer's Bulletin 1683 show the crest of the standing wave of the Parshall flume upstream from the Hb tap. This would indicate that the Hb tap is down-stream from the point of minimum pressure; i.e., the trough of the wave. Is this the way it is meant to be?

This sketch shows a circular approach section like that illustrated for the 10' - to

501

flumes in Bulletin 386. Is this intended to apply only to the larger flumes, or is it intended to apply for all sizes if the construction is of concrete?

(18)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

MISSOURI and ARKANSAS DRAINAGE BASINS

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

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(24)

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MAY 1,1946

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(28)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(36)

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SNOW

SURVEYS AND

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for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division

of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(38)

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SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

• COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

•

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado agricultural Experiment Station

(44)

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SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN.

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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FEDERAL-STATE COOPERATIVE

SNOW

_{SURVEYS AND IRRIGATION WATER FORECASTS}

for

COLORADO

_{RIVER DRAINAGE BASIN}

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECRSTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division

of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(62)

(63)

FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(64)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(66)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(68)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division

of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

Data included in this report were obtained by the agencies named above in cooperation with the U. S. Forest Service, National Park Service, State Engineers of Colorado, Wyoming and New Mexico and other Federal, State and local orgcmizations.

(70)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

COLORADO

_{RIVER DRAINAGE BASIN}

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

Data included in this report were obtained by the agencies named above in cooperation with the U. S. Forest Service, National Park Service, State Engineers of Colorado, Wyoming and New Mexico and other Federal, State and local orgcrnizations.

(72)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

COLORADO

_{RIVER DRAINAGE BASIN}

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(74)

(75)

FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

(76)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado Agricultural Experiment Station

Data included in this report were obtained by the agencies named above in cooperation with the U. S. Forest Service, National Park ,Service, State Engineers of Colorado, Wyoming and New Mexico and other Federal, State and local organizations.

(78)

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FEDERAL-STATE COOPERATIVE

SNOW

SURVEYS AND

IRRIGATION WATER FORECASTS

for

COLORADO

RIVER DRAINAGE BASIN

MAY 1,1946 By

Division of Irrigation, Soil Conservation Service

United States Department of Agriculture

and

Colorado agricultural Experiment Station

(80)

TABLE

_5,

DIMENSIONS AND cAncrrus OF THE PARSHALL MEASURING FLUME, FOR VARIOUS THROAT WIDTHS, .. (Lettere refer to dimensions, Fig. 2)

A 2/3A • •

Pt.In:Ft. In. : ft. In.: it. In.:rt./A: Pt. n.

0-3 :

• 1-6 3/8 :

1-

1/4 :

0-6

2-

7/16

:1-4 5/16: 2- 0 : 0-9 2-10 5/8:1-11 1/8: 2- 10 : 1-0:4-6 :3-0 : 4-4

7/8:

1-6 :

4-9

:

3-2

: 4-7

7/8:

2-0 :

5-0

:

3-4

:

4-107/8:

3-0 ; 5-6

:3-8

:

5 -41 :

4-0 :

6-0

:

4-0

5-0 :

6-6

:

4-4 :6-4*

:

6-o :

7-0

:

4-8

:

6-1o3"8;

7-0 : 7-6

:

7-41

:

8-0 :

8-0

:5.4

71O),8:

1- 6 :

0 -7:

0-3i: 1-3 : 2-0; 2-6 : 3-0 : 4-0 : 5-0 : 6-0 : 7-0 : 8-0 : 9-0 : G x:yree.-flow:Caimeity : : : : Min. : Max. :Ft. In:Pt.In.: Fi.In:In.: In.:Ft.In.:Ft.In: it.In. :In: In:See.7t.:

0-10 3/16: 2-0 : 0-i: 1-0 :

1 1-3 5/8 :

2-0 : 1-0; 2-0;

3 :

1 oit :

0.03

:2 :

3 :

0.05 1-105/8: 2-6 : 1-0

: 1-6 :

3 :

4*: 1-4 : 1-0 : 3-6i :2:

3 :

0.09 2-9*

:3-0 :

2-0: 3-0 :

3 :

9 : 1-8 :

1-3 :

4-10 t :2:

3 :

0.11

3-4 3/8 : 3-0 : 2-0: 3-0 :

3 :

9 : 1-8; 1-3; 5-6

:2:

3 :

0.15 : : :

:

.

: .

. :

3-11i :

3-0 : 2-0 : 3-0 :

3 :

9 : 1-8 :

1-3 :

6-1

:

2 :

3 :

0.42

5-1 7/8 : 3-0 : 2-0: 3-0 :

3 :

9 : 1-8 :

1-3 :

7-3i

:2:

3 :

0.61 .

• :

6-4*

:3-0 :

2-0: 3-0 :3

:9 :

2-0 : 1-6 : 8-101 : 2 :

3:

1.3 :

165/8

:

3-0 : 2-0: 3-0 :

3 :

9 :

2-0 :

1-6 :

10-1* :

2 :

3 :

1.6 .

8-9

:3-0

:

2-0;

3-0 :

3 :

9 :

2-0 :

1-6; 11-3i :

2 :

3 :

2.6 :

2i

:

1-4 :

1-0 :

2-4i

:

4i : 1-4; 1-0; 2-11i

9-11 3/8: 3-0 :

2-0 : 3-0 :

3 :

9 :

2-0 : 2-0;

3-0 :

3 :

9 :

2-0

: 1-6 : 12-6 :2 :

:

14 : 13-8i :

2 :

3 : 3.0

3 :

3.5

1.9 3.9 8.9 16.1 24.

33.1

50.4

67.9

85.6

103.5

121.4

139.3

(81)

TABLE

5.

DIMENSIONS AND CAPACITIES OF= PARSHALL MEASURING FLOW, FOR VARIOUS THROAT WIDTHS, W. (Letters refer to dimensions, Fig. 2)

W : A : 2/3A : H : C : B : E : 1 •• G : IC : N : R : M : P : x: y itree-fl= : Gasseiti. :Min. : Max. Ptan:Ft. In. : Ft. In.: Ft. In.:Ift.In: Ft.rn. :Ft. In:K.In.: Ft.In:In.: In.:Ft.In.:Ft.ln: Ft.In. :In: la:Seo.Ft.:

: .. . : : : : : : : : : 0-3 : 1-63/8 : 1- 1/4 : 1- 6 : 0 -7: 0-10 3/16: 2-0 : 0-6: 1-0 : _1.21: 1-4 : 1-0 : 2-6i : 1 :11 : 0.03 : 1.9 0-6 : _{2- 7/16 :1-4 5/16: 2- 0 :0-3*: 1-35/8 :2-0 : 1-0: 2-0 :}

3 :

4* : 1-4 : 1-0 : 2-14 :2 :

3 :

0.05 : 3.9 : : « : : : : _,: : . • • : 0-9 : 2-10 5/8:1-11 1/8: 2-10 : 1-3 : 1-10 5/8: 2-6 : 1-0: 1-6 :

3 :

4-g :

1-4 : 1-0 : 3-6i :2:

3 :

0.09 : 8.9

:

: : :

:

1-0 : 4-6 :3-0 : 4-4 7/8: 2-0 : 2-9* :3-0 : 2-0: 3-0 :

3 :

9 :

1-8 :

1-3 :

4-10 1 :2:

3 :

0.11 : 16.1

:

.

:

: : :

:

: :

:

1-6 :

4-9

:3-2

:

4-7

7/8: 2-6 : 3-4 3/8 : 3-0 : 2-0: 3-0 :

3 :

9 : 1-8 :

1-3 :

5-6

: 2:

3 :

0.15 : 24.6

:

: . :

:

: :

.

2..0 : 5-0 : 3-4 : 4-107A: 3-0 : 3-14 : 3-0 : 2-0: 3-0 :

3 :

9 : 1-8 :

1-3 :

6-1

:2: 3

:

0.42 : 33.1 : . 3-0 : 5-6 :3-8 _{:5-41 :}4-0 : 5-1 7/8 : 3-0 : 2-0: 3-0 :

3 :

9 : 1-8 :

1-3 :

7-31 :2: 3

:

0.61 : 50.4

:

: •

:

4-0 : 6-0 :4-0 : 5-1058: 5-0 : 6-4.,.. : 3-0 : 2-0 : 3-0 :

3 :

9 :

2-0 : 1-6 : 8-101 :2: 3 : 1.3 : 67.9 : : : : : t : : : : : : : : : 5-0 : 6-6 :4-4 : 6-4* : 6-0 : 7-6 5/8 : 3-0 : : : : : 6-0 : 7-0 :44 : 6-10 YE: 7-0 : 8-9 : 3-0 : : : : 7-0 : 7-6 :5-0 :7-4i : 8-0 : 9-11 3/8: 3-0 : 8-0 : 8-0 ;5-4 : 7-10 IR: 9-0 : 11-11 :3-0 Soe.n. : 2-0: : : : 2-0 : : : : 2-0 : : : : 2-0: 3-0 : 3 : 9 : 2-0 : 1-6 : 10-1* : 2 : 3 : 1.6 : 85.6 : . : : : : : : : 3-0 : 3 : 9 : 2-0 : 1-6 : 11-3i : 2 : 3 : 2.6 103.5 : : : : . : : 2 : 3-0 I

3 :

9 :

2-0 : 1-6 : 12-6 :2 :

3 :

3.0 .

121.4 : . : . : : : 3-0 :

3 :

9 :

2-0 : 1-6 : 13-8i : 2 :

3 :

3.5 : 139.5

(82)

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