455. Jackson Ditch 7-foot flume, Thompson Farm, May 1947

(1)

SOIL CONSERVATION SERVICE PAYMENT OF POSTAGE. £300 1,10F 7471L,_{BOX D} 1.1•7, UTAH OFFICIAL BUSINESS

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..tqrgiestelliiMMINIPIWileaseappgr 411FAM, Mr. Ealph L. Parshall Irripation Investi,zPtions

c/o Colo. Agric. Experiment Station Fort Collins, Colorado

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(2)

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rort coi1tc, Color.do May 27, 1947

The Jackson latch 7-ft. Nrshall' atrium Flume, at the Thomi:soe; FNre4

rhis disoussioa concerns the measurement of water theough ttlis flume

under its print conditions. Eeeausa of the lowerini of the floor

it 16 determined that tila flow will be highly submersed throughout the

full ramie of discharge vnich is .aSOUM4iiii to be approximately f.; secoAd, feet rta a maxiewm. The following table, txtsed on ass000d repthe of water

downstream fro4 the flume, shows the doom, of submergence fr the floor

ts.t. elevations t 100.000 100.50, 1)-0.75 zind 101.00.

Yloar .;.t 100.00 t 1W.50 .:,A,

- :t, 101.00

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-Sub. 101 .53 .- 4.': .53 -.v3 .53 -.28 0 15 .97 .95 98 ..68 .45 tkl Joe .05 37 .66 -.05 0 20 .84 .67 80 .81 .42 52 ....:,1 .17 21 25 1.02 439 87 .955 .64 67 .93 039 42 30 1.22 1.12 92 1.49 .87 80 1.04 .62 60 35 1.415 1.33 94 1.25 1.06 86 1.17 .84 71 40 1.o2 1.56 96 ' 1.44 1.31 i 1.31 1.06 81 45 1.78 1.62 1.53 94 1.47 1.28 47 50 1 2.08 1.83 1.75 95 1.65 1.50 91 ,

%411 be observed that for - 6-inch rise ,t the floor the submergenee of 70

percent 1111 aeour for 3. flow of about 17 or 14 atooad-fset and will reach

xlmos of 96 2erceet.4t a flowof 40 second-feet. With the floor raised

9 inches a submergence of 70 percent void be reached at t,bc;lat 25 seeona-feet

and a 95 percent livbaergemes 41t 5.0 second-fset. If trio floor It-Le raitaed 1 foot ths3 floe woalu be at 70 peraentp„teuhilerged at about 35 sesohd-fet, :Ina 91 percent 11%-t 50 second-feet. For diochargoo le.s thous 70 percent sub.,

(3)

-2— _5-27-47

sabmerged flow •conditions both Ha n'nd fib heads required in order

to complete the ratio netoery in caloulLttng the discharge. There is bereibith attained a Free Flop Discharge Table for 7—ft. Parshall measuring flume, together with . correction al/4m seeded for subaorged flow c..giditiona. The uaa of this diagraa is very eimpl •ana there should be no difficulty in undemtandigg bow tha corrections are to be applied.

I tiovld be pleased to personaly instruct you and your opert.tor& on how to calcul-te the rate of flow for Jay nolo conditions that

isiebt exist through this particu1r me ring flume.

It is my opinion th,A the present floor rilevatioh of this structure at 100.00 is too low for satisfactory opemtion. It shou14. be A„ least at elevation of 100.50 but preferably t 100.750 witio would be 9 Inches higher than th prent Glevntioh.

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Discharge Table 7-Ft. Parshall Measuring Flame Free Flow Feat Sec. Ft. 0.30 4.08 .31 4.30 .32 4.52 .33 4.'75 .34 4.98 0.35 5.22 .36 5.46 .37 5.70 .38 5.95 .39 6.20 0.40 6.46 .41 6.72 .42 6.98 .43 7. -;!5 .44 7.52 0.45 7.80 .46 8.08 .47 8.36 .48 8.65 .49 8.94 0.50 9.23 .51 9.53 9.83 .53 10.14 .54 10.45 0.55 10.76 .56 11.07 .57 11.39 .58 11.71 .59 12.03 0.60 12.36 .61 12.69 .62 13.02 .63 13.36 .64 13.70 0.65 14.05 .66 14.40 .67 14.75 .68 15.10 .69 15.46 0.70 15.82 .71 16.18 .72 16.55 .73 16.92 .74 17.29 Ha Feet Sec. Ft. 0.75 17.66 .76 18.04 .77 18.42 .78 18.81 .79 19.20 0.80 19.59 .81 19.99 .82 20.39 .83 20.79 .84 21.18 0.85 21.58 21.99 .87 22.40 .88 22.82 .89 23.24 0.90 .91 .92 .93 .94 0.95 .96 .97 .98

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1.00 .01 .02 .03 .04 1.05 .06 .07 .08 .09 1.10 .11 .12 .13 .14 1.15 116 .17 .18 .19 24.08 24.50 24.93 25.36 25.79 26.22 26.66 27.10 27.55 28.00 28.45 28.90 2'9.36 29.82 30.28 30.74 31.20 31.67 32.14 32.62 33.10 33.58 34.06 34.54 35.02 35.51 36.00 36.50 37.00 Ha _Ha

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(6)

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Floor at 100 at 100.50 Ha Hb Sub. Ha Hb 10 .53 .22 15 .97 .95 98 .68 .45 20 .84 .67 25 1.02 .89 30 1.22 1.12 35 1.415 1.33 40 1.62 1.56

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(15)

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