SPECIAL SEWAGE P!iu.ol.i.i!i ... ~·

HaiGalois Timourian

June9 , 1922

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CALIFORNIA INSTITUTE OF TECHNOLOGY

Pasac.lena Ca l if'or:nia

- GI!:NERAL OUTLINE-

A. I:ntro~_uction.

C. dcreen1np.; and .,trainino·

1 ., uand operateu scrt::ens or

~;_-::_i' C u._esh screens

c . Basket scr•ee:ns

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l!:o J?relimina ry 1'reat nent o:f Sewa::i:e 1··:,r Uhe:mi cal Precj_~i t~tio::1

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nnccrt~inty a s to the strength of' the east abnt~nc:nt

T le cost of an nrch dam r.:houl cl ,,iot he ove"'' 50~ to GO~

of the t,'pe here cstimntc<:l. :if it sl-iou1·1 be :fonn:l :tn'acti­

eable later to install this class of structure~

The 1wo:rile s 10wn t n F i,o.; . lG was t a ker.. :frm~: "The

nes:; .. :~: Anr""' c---· ·~ t..-.uction o:r nams:", ( "fc ~) .a.!P~, •. 'l'h is design

~ms f'or a 2cr ".'o'Jt '."fa.n 1m.t b oth fac .s we1•0 pr~duced. to

(';ive n. prof'ilc ~00 f'0et hir;li. The 300 .loot prof' i l e wn.s

:tnvestic:a tecl as to t!.10 l ocat j_on of the resu ltnnt 1 ·:i.-~h

the res crvotr f'u 1 ant1 :round to b e near e nou ;'·h t~1e t h i .rd

p ain t to justtfy us ::tn:~ tI~is JH'Of:ilc f or• c<~.lculat :l. nf'; vol-

ur:;,c s of' concrete .

The cross-section 0f t~c canyon at the dam- s ite

was obtni~ed ~y . easurD ~ t h e dist~nce bet~cen the s~ne

contour on Of1p o s ite sicles o ::' t.he can~ron . T!lic data was

'(.:tken f ror >ap No. T. 0.':~1 of' the L os Anp;eles F lood Con-

t:rol . District .

The ~re servoir capacity cnrye ~vns d.rn.wn rron

11a t0, :'.:'urni.shcd by Mr . s .n .!liorr· s , Chie:f Enr;ineer of the

Par;ad ena W~ttcr Depnr t ment .

I I

The prof'il e of the dam 1as divided into 20

foot sections and the a.ron of' each comzn1ted. The lc-m-

g t ll O'::' each section for various heio;I-:--1.:.:» of dar1 \·as

nearmr'Yl on Fib~ · 1-:l ancl the volumes crn;iput~rl as show 1

0 11 pa.<>:;c • I n Cf.lti1>J:->. t~ .;-; ,· ; t ' 1C cost of' the rlam a unit

cost or ,;;1 ::;. JO p~r c1i. .i•~ yarrl. :for concrete was used..

To "!)rin!:': t .1C mter into P asa(lena. it wi] 1

b e neccssa-Y' Y to drive a tunnel two and ono- hal:f niles

l".mf :from t 1e Tejun:i:a to the Arroyo ., The c ost of' c.lriv-

i nt. the tunnel was est:ima te<l after rea<l.inr; numerous

clescriptions of' types afid cost given in 11 Hodern Tun-

ncLi.H!". " "by Erunton arn:.l Daviso The Bl:lzabeth Lake

Tunnel on the Los Angeles Aqueduct c ost $40 .t:O per

f'oot. It is ?.6 ,. 8 70 f'eet in lenr;th ancl 9 by 10 :feet

in cross~scctio:r~ .. It was driven through meclim:1 to

harcl granite ,conpleted February 1 !H1. The l\Iiss:lon Tun­

nel , Santa Barbara, cost t1D. Q1 per :root clr:tven th:rough

shale and har<.l s n.mlstone, lenr;th 10,fViO feet , cross-

section trapczoid, 4 . S reet wide at the top , 6 feet wide

at the base !ll aml 7 f'ect hi .• ;h ~ 'rhcse tunnels were bu11 t

i.ur:ln~ a pe1":ioff of' low construct.i.011 cost but t w Eli-

z1beth Lake Tunnel is of' consi1lerably larp;e1• ct .. oss-

sect~on than ~ould be necessary in this case . The loca-

Lion of the worJ·,Qspecially nt the Arr oyo portal would

be more econo!:iical than th~:··, at El:lzabeth La!ce. It is

belived that the cost of' const:ructinr; such a tunm~l

woulc not be over $50 . 00 per foot at the present prices .

PO\'.'El :")EVELOP~ :r:NT •

The water coul<l 1_,e brourJ1t 1·1to the Arroyo

at elcvatt on '? , ~ OJ hy placint>; the Vm:'lel intake at

~,O O or ~ivin~ a fal l of f our feet per mile to the

tunnel. Placin~ tie tunnel intah~ a t this elevat i on

woul rl waste abou-·. ~:- () :feet of' stora,o;e, whieh at?J.ount

has hccn ~ ecluctecl tn est:irnatin['.; the re:·~ulatecl i'low

I' or c'l:i.f'l'erent hct."'hts of tla.m . With the tnn:1el at.

t 1is point there y;onl cl alwa;.rs he a pool of still wa-

ter 8, 100 feet in l onr;th arn1 «..:over1nL~ al·iont twelve

acPes ,;-~1ic l wou1d can~e the strea!'! to c epos:i.t w0l l

a·bove the t1am a l l r~ravel ancl. 1)0 il "!.ers brou;;;ht d.ow!l

i . 1 t :i.Jne of f'lood.

F oll ow int~ around t. ie ~ , 0.)0 13ontou:r ::'r:.r two

miles on the c ast s:i.r1e o:~ Cic .\.rroyo c.ys:ttc :for a

power- house :i.s :i:'01E1•l w:it' 1 an avail a.l)le not heacl o:r

(1()1_" ~~litton) ,,r';i.rer; :;. '"'7 . 00 per d lowatt of C<llH'.t -

200 F. '.\' . cr>.pa.city . Two-1 nP1~1re'.J. cl o llars :!_)Cr :c . ~·,'. will

be ulln5cd in U1io estinrte.whic1 ~ill include t~0

I·; has 11cen st2.t ed JY on<~ o:.n the City ?!an~

ai~crs t "mt Pasacl.ona can atfortl to y:tyf:>. 7 000 a mi­

ners inch i"o:r ~ ~1or-:~ sti.c writer stnply . This at

f i rst t 1ou.r,;ht sem;1s an enor:'·nns pr·:tcc ~:~1t 1_;:; real-

pu1•1rnses at ;~"}. 00 nn acre foot .

The lJrocnct:ton coE:t of lWwer sol rl ·r,y Pasad.c­

i1::l. ~1.nrtnc t 10. ~'ear 1'.J~0 --? 1 \ ': ci.s $.01.111 '7 per );-::Po-

"";":att :i-iour . ':!:'his ~ras sold a t an av e r.ar;c price of'

~;.Q '."' ::171 per ~ :. 1·.-. I: .. ;r.a? ~:in,n; a net p r of'it of' ~~ .. 0~~?1

n er K. 1 ·r ~ ~I . or $1 <">G ~er ~i.. . ~l' . year .

F rom t:1e ta1Jle sho11:i. lg the rat io of' cos t o:r

the project to t he ca1)it:1.lize<l vo.lue of ;~he rc"'.renue

1:erivecl it :is seen that at t he untt :prices used

here, any hei~ht of' d am between lf.O ant 200 f'eet

coul d. be hutl t at some profit t o the ctty. The

mar~in of prof'it is so ~all that the proj e ct would

harc:.ly he expcctccl to more thn pay the interest on b

t he investment .

I:f more t~:1an suf'f' ictent storap;e could be

secure(""! tn t~ c 1i.rroyo to :fnllJ! develope t hat

strean it is possi1Jl e that a great :rn rt of' t 1e

f'lood f'lm;r of' the Te jun1~a could b e saved which

otherwis e would be l ost . The t 'J t al aM.ount o:f spill

shovm on t he last curve amounted to 2121

0 00 acre­

f'ect or an ave ar;e spiJ.l p:f 1 1 , ~00 acre-f'eet per y ea.J' o

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