Cal if'or:nia (2)-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 2. £Iechanically 01)el'ateO

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SPECIAL SEWAGE P!iu.ol.i.i!i ... ~·

HaiGalois Timourian

June9, 1922

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CALIFORNIA INSTITUTE OF TECHNOLOGY Pasac.lena Cal if'or:nia

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-GI!:NERAL OUTLINE-

A. I:ntro~_uction.

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u • .rlc~olvinB sc1·eens

~. 'i'he winr,'. screen

V. '.i'lle ~tead.in;:; screen

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1. uri t chambers

2. Fine sedime!!tatio:n

l!:o J?rel iminary 1'reatnent o:f Sewa::i:e 1··:,r Uhe:mi cal Precj_~i t~tio::1

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L:::: A POSSIBLE WAT:m fJUPPL7 Fon PA.SADE!~A

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PA T T1'.'0

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

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

of the t,'pe here cstimntc<:l. :if i t sl-iou1·¹ be :fonn:l :tn'acti- eable later to install this class of structure~

The 1wo:rile s 10wn tn Fi,o.;. lG was t aker.. :frm~: "The

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

~ms f'or a

2cr

".'o'Jt '."fa.n 1m.t both 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:atecl as to t!.10 locatj_on of the resultnnt 1·:i.-~h

the rescrvotr f'u 1 ant1 :round to be near enou;'·h t~1e thi.rd paint to justtfy us::tn:~ tI~is JH'Of:ilc for• c<~.lculat:l.nf'; vol - ur:;,cs of' concrete.

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

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

contour on Of1posite sicles o::' t.he can~ron. T!lic data was '(.:tken f ror >ap No.T.0.':~1 of' the Los Anp;eles Flood Con- t:rol. District.

The ~reservoir capacity cnrye ~vns d.rn.wn rron

11a t0, :'.:'urni.shcd

by

Mr .

s . n

.!liorr· s , Chie:f Enr;ineer of the Par;adena W~ttcr Depnrtment .

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(24)

The prof'ile of the dam 1as divided into 20

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

011 pa.<>:;c • In 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 Pasa(lena. i t wi] 1 be 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 cost of' c.lriv- int. the tunnel was est:ima te<l after rea<l.inr; numerous clescriptions of' types afid cost given in ¹¹Hodern Tun- ncLi.H!". " "by Erunton arn:.l Daviso The Bl:lzabeth Lake Tunnel on the Los Angeles Aqueduct cost $40.t:O per f'oot. I t is ?.6,. 870 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 sn.mlstone,lenr;th 10,fViO feet,cross-

section trapczoid,4 .S reet wide at the top,6 feet wide at the base!llaml 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 Arroyo portal would be more econo!:iical than th~:··, at El:lzabeth La!ce. I t is belived that the cost of' const:ructinr; such a tunm~l

woulc not be over $50.00 per foot at the present prices.