287. Laboratory measurement of evapo-transpiration losses

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UNITED STATES DEPARTMENT OF AGRICULTURE

BUREAU OF AGRICULTURAL. ENGINEERING DIVISION OF IRRIGATION

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

J'une 19, 193'7•

Mr. lt. L. Parshall

Colo. Agr. Experiment Station Fort Collins, Colorado

Dear Mr. Parshall:

Air Mail

I am returning your paper on "Irrigation ater Resources in Colorado" tor presentation at the allllual convention of the American Association :f'or the Advancement of Science, which has '

been reviewed and corrected in this office. You will note

we have omitted the last paragraph cone erning "The Water Problem"

as we did not consider it good policy to indulge in a discussion of this nature.

Your paper on "Laboratory Measurement ot Evapo-Transpira-tion Losses" tor presentation at the meeting of the Hydrology Section of the AmeriCan Geophysical Union has also been edited

and rewritten,, and is enclosed. As you only furnished two sets of the figures, we are retaining one here and sending the other to Washington with a copy of the paper. Youm.doubt have extra copies of the figures and can attach them to the copy herewith.

Very truly yours,

Division of Irrigation,

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Director

UNIVERSITY OF CALIFORNIA

COLLEGE OF AGRICULTURE

AGRICULTURAL EXPERIMENT STATION

DIVISIO~ OF FORESTRY

BERKELEY

June 14, 1937

.FOREsT. SBRVIc£ -. .,

ROCKY MDWTAIH FOOm & !Mf·:C£ EXP. STA rORT COU!N3, CO!..!.i:-'U.DO

Rocky Mountain Forest and Range Experiment Station

Fort Collins, Colorado

JUN 171937

RECEIVED

Dear Dr. McArdle:

'fith further reference to my letter of June 5 in regard to the forthcoming S. A. F. meeting, I am enclos-ing a copy of my paper to be presented at the joint meet-ing with the engineers. Will you be good enough to give Mr. Parshall an opportunity to look this over before the meeting? I have not yet received a copy of his paper, but I assume it will arrive in the next day or ~10.

A letter from Schmitz as Editor of the Journal has confirmed the postscript in your letter of May 18, and I am ·writing him that I shall be glad to send the ori-ginal of the paper to him immediately after the meet-ing, unless it should be decided that all the papers on the same general subject should appear under a single cover.

very sincerely yours,

t

t:t!;;:~

2

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-io in ig t r in t tOrt ~nt it 1 tervenin· _erio

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or

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ters w o 1re con erned .'it t e nt

or

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rc

diff re t r Q o to cific

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cov r . l l v lo rth· · C!t t e · nt rc tion reo ti a be n

t

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in ·r

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cget 1

25:' 0

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r n r tion i th os tt cult of th t e f

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1 hen a plied t

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·a.

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..

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Y r

sti t d 4 to 6 inche$ for on t r n t 12 inc

tr e (7). By dir ot sur nt from b neh !n pl

60 y ar beec~-maple o ino es (8). t 1 N York. t tor d oi uou in 50 to th T

Indir ctly, val abl 1 dio t•on,

o tion oft e· at r oyel. oro tor

y be d rl ed by ~e

or

of .. oi~ture 1 th soil

ritt n

I

+

T

+

E

•

)

•

_-

_s'

₁ h.lch 1

terc ti n, , tr ns ir tion nd ~ e or tion. Reoo to..,. runoff

) n om tor pr o itati n (. ) il le. Th 8 p g

( · ) 1 ne 11glble in r 1 te n other 1 ervi u

ere-A

0! 1 t 0. th influenc by ation 1 l t the

lff .. r no th reci. itation nd th ru

orr.

Th1 tho o _ ro oh may e 111 tr t d by stimated

tis-ure for· th Stani 1 us 1ver dr in _{st slo. of the Si r.ra}

in Oal1torn _• The preoi 1t tion 1 3 1noh .. n und r e 1 ting \~

\

the runoff

con itions of or t covor/ 1 2- i ches.

the

1 t r nc , 17 inc e ,

hould clo,..,ely r I + T _• Int rc t n

ro

0 ·-b re ord in 1 t

11-a e ho TO 0 0 o the r ci ite 1 _• h u

less en t o the t hol , i te ce ti . y be

in 11

st t d at

or

th r ci tion o ino • r .

inc e r re en n th of vapo io n tr n .ir t on.

r n ..

1:r tion rectiv t roug o t t d .th f h oot zon hie ·

or .. st d ly ill b no e f t, bil ra ion

i eff o y in .th fi t oot. I 1 ly, t

tra ir t on of ever en ore t r oil o not fr

dur-ing the 1 te.,.. NOUl d 2 or 3 t e eva or tion On is

ba i e o• tion woul~ be et d 4· in ~ s . a e

m nt or

the eva oration from t e no he e h 1 r t of be en 0.001 nd

0.002 1 ch pe day, hioh o ld g1v a total of les t an~ inch lose

!'or the 5 onth of sno cover. 'rhi r.r1 1 gl lo t1 ure e to

be eculi ni.r d sno to tl t t e t ~lo of he t r rJ.tur r:: bo ez1 hich nc t oun 1 e ult 1 los

her

th 0 b e Ol t to th t1

n

.

y oond nsa io

other e t te of ion

r

o t e s 11 th sum

-mr y be ade y tart1ng ith h one nch of ter v i.ch t e upper

foot of soil wi 1 hold at eld oi~ture ca city .ortly fter th

sno di ars. The light eumm r rains to 0 t nch . , .

ot

h1ch 9 _{ln., es ·1 . bt eot to e ;.or Tl t t 0}

v or •

tion or h· a.r n e out 3 _• eduotin.~ t. 3 inch

r a·oration f o 11 no re t o ... ev or tion

lu t n pi tion le e 8 inch t e tion.

t ter ad

1ne

th yi ld of t r by r ducin th d n it nd 1 n t 00 0 t 0

r

00 r it e-co 0 n es ht b in th lo 8 ld of t rex" . . y oder te t e t i it t1o- ld till b 4 1 ibl o re uc t i 1 n tro 1 .. to l 0 no cs. t l ~ me t _{.e •} tr n.:plration ould be r to en r b bly -e in

-c e 0 4 inc ... ul then

e

u 1 14 inohe

0 1 a t 7 inch e t1 ted undr 1st1

eondi-1o 1 _• T the itf~re 0 t

n

th reci

ita-·inu 14, lee. in· 29

inc a

0 .ain of

3 1. _a • 3. h , a tax·, 8 -rc .. ult of. he .1lv eultur 1

t n t n e .. eriment t 9 in

b eo ti ~

t

r t ro 1.5 che~. ( 3) .

q tlon t r e rel 0 1 ca le to _ti

-u - 1 .. 0 • t. _t

n

Cali.tor 1 _her

lo rent!!pir tion ~ 1 _{che for} the

to 5-4 ch s 1. 0 th ctob r en

d (

)

.

s lo in c th: 0 1 h

tio 0 th

ar

a

on

t r r bot o e

th illo the:r 1 ~r a t tion ao s to

0 s s c u tan 5

t

o-t 1 t t r t

0 of

t

r

_or

t

· t _{ol • nc dent 11 th ct! n et e}

_{tr n}

i 1n .t e

reas

t 1 h ~er t 1 here .ma 1

c -

b a n ...,h v

on

h ur t t e 0 ~. to bl f' "I ( ' ca , .(_{1 ,..}

I)

•

_'2 o tha 1 d h r o zan no .t ry or .nt"il 1. Intaro sur,d or t t e

sol d ·o fin· r t1.on lo

the eva io of 1 n n t t

vic of co erin~ th oil

t

alone, t lo 1nd r t

1 t vOU i tbe soil oi t n

by ev por ,!on s wou d b; th o s un e~ n

som l i ,h so i 1 o t e .n a tur 1 re n re o sa i t j g O·ing avin

t

t r e • f ot., h 0

v

1 o r tio can e 1o . may t e b ffi lt n th ot. t o t n no t r ly h n 00 0 n l co it1 ns. ~y· 1 lt

ne u

ly

n

t ion b

n

e-1 ce y otel. of J me ...::

z

n ens1 y., rel 1 is on

e r n ed of , t"~'d.

ore i , "'l·oul nc t ol

1. en v por t!on ro dl

ter

t

! .• di t in • oil n

-

.

1 . 8

ry-1 kin s, izea n 0 n l 0 nd h tr d

ot

e or tio ith " or · oistur o te t f' soil.

• 0 asures o tro

3. o ... for t a re o tr pir 0 n

s 0 0

ra

1r c _•.

o c neu-r or tio tr pirat o _

1 t un.it onv • • 7.

toot o

G 1. "

.

v lua. 1o t t

or

1 t E 6. ,m n Q. _{0 d.} t , _{to t} in e a io"'l by rno , • ..:....J.

·or. Div. ul.

ob r E. l(l ):6'71-• • 2no. 1928. • 52Q 0· • d • tely, rc lti

'

t n ir ti_ 0 t

,

ci ..., ty·_ et ti ~ _•

aonver .. 1 . actor tor .. t . us.

er

of at th an yiel· r:y b c s -.ho 1 .. o t yi ld f ul ani u-nagE3ment. n

·r otic o· io lture.

iol ~ica t q n 1' ocky 'ot

~ 2 (2):9 • • n lo • R ~-o • v1 t tur

c

lit. on.d1-'2 pp. 02. 0 t I .. flu no

.

s

. • .

t T n 1 ion y orest e cO •

Elenent of Hyd ology. N.Y. John Wil '1

10

1 Q _I L.o ~

_•

l .3 ho·

t

t a· r 1r

t ou _• r t 9. G _{• "tu} 1

to

f Co if rou 1 n.~ _{• l .} ( -7., 10. on, t 0 y r., For. ~ 5 .. 7 o.) 1 • _• .. & t

'

t r nts 0 'lan _• 16.

•

1 13. _• t r