Devil's Gate Reservoir and Its Effect Upon Pasadena's Water Supply Citation Honsaker, John, Jr. (1921) Devil's Gate Reservoir and Its Effect Upon Pasadena's Water Supply. Bachelor's thesis, California Institute of Technology. doi:10.7907/089P-1R06. https://resolver.caltech.edu/CaltechTHESIS:10122015-095750872 Abstract [Introduction] The Devil’s Gate Dam has been of great benefit to Pasadena’s water supply, in that it prevents a large amount of the flood waters of the Arroyo Seco being wasted into the ocean. Item Type: Thesis (Bachelor's thesis) Subject Keywords: Civil Engineering Degree Grantor: California Institute of Technology Division: Engineering and Applied Science Major Option: Civil Engineering Thesis Availability: Public (worldwide access) Research Advisor(s): Unknown, Unknown Thesis Committee: None, None Defense Date: 1922 Record Number: CaltechTHESIS:10122015-095750872 Persistent URL: https://resolver.caltech.edu/CaltechTHESIS:10122015-095750872 DOI: 10.7907/089P-1R06 Default Usage Policy: No commercial reproduction, distribution, display or performance rights in this work are provided. ID Code: 9211 Collection: CaltechTHESIS Deposited By: INVALID USER Deposited On: 22 Dec 2015 21:40 Last Modified: 16 Aug 2023 22:05 Thesis Files Preview PDF - Final Version See Usage Policy. 10MB Preview PDF (Chart) - Supplemental Material See Usage Policy. 14MB Preview PDF (Pasadena sheet) - Supplemental Material See Usage Policy. 11MB Preview PDF (Tujunga sheet) - Supplemental Material See Usage Policy. 12MB Repository Staff Only: item control page

... ~- +. Part 1. fl " The Levil's Ghte Reservoir . ') t.J • 3. " 4. " * *· 5. Conclusiont:3. .~_yrpcndice[~. A. - A Portion a~ the Report by Chien nicipEl ~ster ~ep£r t ment City ~anaee r, c.m.Koiner , mnbe r B. - !:.'.i&!:1S · ~~nd , l 'Jz: l. CTa~e to se~t - 1 ~3VIL'S CAT~ R~SEHVOIR The Dev11 1 s Gate Lem h a s been of great benerit to Pos~ - d en.a 's w.ster supp J. y, in trwt it p:r·events a 1e.rg·e amount o" t he "load ntcters o" the Arroyo S eco be inf vVE:sted into the oe-e2n. The ct"'!n F.ci ty o" the :reservoir ereFted by this dnfl is 4600 oore - ...eet end the he i t:ht o " the s,o i llv;t1y a. bove the st:r·,_:;2rn. bed i s cpproximatoly 89 "eet. The 6Rm was buiJt pri ~~rily "or ,.lood• control but I believe a s s melns ofl ... load control it i s in - we see t h 8t i n one d ey , ..!' ebruer;y r.: o , 7380 r:cre-.L'eet o" 1r:& teT vo ir one Rnd o,.,. ws ter one-hal~ c e~e do~~. ing BS ~1ood lnTee ~. s to " ill the reser- The -011owi nf aEy 3640 acre-~eet times. or elmost enough to flill the reservoir cou11 rot be used t o prevent The next enoug~ This i s came do wn the Arroyo Seco. H ~1ood 8Uch ftB oocurre ~ occurred in 1~21 snd 1922, but wDs "'a r the one '))revious l y menti oned . in 1?14. - ro~ In tLree be- dn~1s (December 19 , 20, 2 n d 21, 1921) enoup~ water ( 4609 acre -ryeet) came down the f'..rr o yo to ''ill the rese:r-voiT'. i::.tion o ,.. the gates e -"load o -" such trolled so that no d ~.:mage ~"- By }ll" O}'.ler 0~)8r - chF.racter mi ght be con- would be done "'urther cJovm the ::;trecrn, but tni D would rneo.n thi:·t tl'rn :reservoir v:ould or nrectienlly em·p tied u "'te r the "irs t h~we to be emptied stor:i:r1 c;nd the:re would then be e large wEste o" water down the Arroyo. There has been a great deal o" discussion &s to the pro per way to one::cFte the get e i;:: o " tlie darn so rneximurn conserv~tio~ o" water end e t the ~~ s s~me cess r·loocl Cl.&l11G['B ....urthBT dOWl1 the }.rroyo • to ob t a in tl::e time prevent ex - }_t the present time I believe that Eneineer Re£gan o~ t ha ~ louu Control Dis trict h&s issue d orders th&t the re servcir be operRted en tirely fo r mel~ns ~l oad control up until ~ay 1 o" e~ch yeer. This t lH"t r. ~ter every storm occurring be "ore Me.y 1, the wB ter collected behind the dam will be let out as soon as it is nossible without ceusing ~1ood d amage . ~ny Arroyo a "ter May 1 wi ll be conserved . d a m wi ll be op very litt l e use ... or wetar coming down the This will ~ean t h at t he conserv~tion cause rHin-"t=:ll data show that &lmost ~11 pu rpos es ~ be- the storms worth not- ine occur be "ore :·~ey 1. I believe that the conservation op the ~a t er is as important i .~ not more i mpor t Ent th<=:,n tho a tt empt to control the '"l oocls "o r t wo ~re D.s ons: ... irst, because o ... the hig h value o -"' water in Southern Ce.li "ornia, and second, beca u se n rey)etition o"' the 1914 '"loods will c e.use grefi t d.amage be l 0v; v1l:ether the ds.m is there or r..ot. be ke~ot I woul d sueeest thc.t the reservoir a1)n roxim& t e l y one - ha l"' ""ull i-~ po s siille unt il ~~f:y 1 o -... each y e ar a nd prom then on e ll the water co minf down the }rroyo should be held ba ck . This would me a n tha t ip n stor~ occurreci b e '"o re Mey 1 lerge enough to '"ill the reservo ir more than oneh t:cl"' ''\i_ll, enough o'" the W[: te r would be le t out as soon s.s 3 }loss i ble, v,;i th the le fl.st dsmae-e be l ow, unti 1 the reservoir conta i ned one -h0.l ~ i ts meximum caJH::.c i t y Eif:fLin. Thus the max- imum "looc1s occurring, sa.y, once in 10 yeE.rs v'iOUld over·"low the d ar:1 ana c Emse some d.amag:e -"ur t ber down the J.rroyo, but it would also mean the:-:t during the dry yenrs when the WE ter is grer-.tl;)r needed a ll the Wl~. ter corning dorm the Arro :.:ro seco would be conservoa anc1 11l l owec1 to percolate into the under ground. b1:;.sins. The bene"'it derived -"ro r:1 tl:e conservat i on o" o,.. t Le Yit..te r I believe ViOul d be greater t han the damafe c&used by a ,..l ooa onc e in 10 years. The ~ a ll owing ~ata t:Lree yer,i-s during the "'lood.s . and maso curves lf3 st 0" those t Lr,::c thD sho~ thct only ,..or lf. yecrs wc: s the re Fr.) / dvncer o" ,..lood. o" 1 0 1 4 r:nc! l:Jl5 could be handled wit hou t a.ny O<.'.me.ge by ke e!)iilg the reservoi r one - hul-" -"ul l as stet e d ~1bove. The ,..loods o - 1921 ona 1922 might csuse slight d Rmage , whereas the lGrge one op 1 9 1 2 not be prevented ftrom doing d~m~ge s t oraee reservoir be cre e t eG. 1 914 could in a ny wcy unlese a l a r ge r The l Hs t curve s hows the capac - ity a~ the re servoir -or di-Parent heiehts the dn.'1. ~n d a~ t he w&ter behind 4 :LWll - 0 .::..:- II! SU T'-.i:'.!ATIOHS 0 .J.!' I.~O TT J. I·!. 1 =n::oeTn.ber AT<:cj_ 1 ,:; o ~ , ~ i.:5 2 1650 1 90~~- ~ ,- 1910 1.~ F. y 587 E~ June July ~260 1911 ~ ' •.) ( ; ~ :~ 14 136 Octobe r Hovembe r 14-G r;: .J 111 ';! 0. 0 "2 ~ - ' ' - .;! c. De c e :ni)er 10 5 '7 ,, , 498 1·-rr-_y June Jul y f_Ufll St l J l Z, r..· I! J V nUh l'Y ~~ 7 2 ! T)Y i l Na.;y June July 14 5 J6 4 ,56 0 4 ' 6()? .'.J: 6 4 () ' 4 , :Jl J 5 lGG 5 '• :-~0 7 5 , .40~:· 5 , 46 1 5 , 4~5 5 , 510 24-~·:. 58 74 15 0.3to b er ~0: 1 ZOfi i~9 0 -!·.~(':?Y C"'f"" r~~> ~~ overnbo r i:'e b rut' r y !::a rch 4 ,fi Ol 4 " -Jt:_ ('..°.! l) i_..l= December }. tiril 8 , l~~o lS , 100 r.-! ,0 80 1 ,0 10 5 , 54 1 D , 846 6 ' 1 " ,.. 1 ·:1- ' 2 (j2 '-.:(.., f7 r ,·/ .~. r "" ,.. ~- · ,Do.:, 2 6 , }~L:-f 5 G4 ;-· 7 , ~5t 2 7 , f31G 1 7~ 7 Z8 ' 150 30 , 28? zz.4 June Jn1y Atlf'U St S ep t e::1b e r jz 105 Octolrnr F overnb er 40 r 28 ' o~ ,~ 74J Z· ;.;; -;J , 4- 15 40 , 79 5 4 4 , ?·5f> r;· r.1 45 , •.-· f .) 4 5 , :3 28 lJecer'.; b er J f; :mu-·.r y 1 9 1 4- 1 7() 42 29 Z'J J ~'rm r:; r:; 2~3 ~ 3 , 70G October .Deeomber ' ' ' r:> r.:,'::J I 4 , <°' .< '4 67 S e ;1te ~'1be r Ao.g •.l s t Sent em"l)O r ' r./ f~.1 ( . 20t3 5:n ' "" h Hovorn1Jer lJlf~ G -;;: ._, Septer.-,bor 1912 740 ,. ' , 1:35U r~ 10~~ 6 t± .~.Uf'-'USt 1 9 11 2 ' 43 -J ..-, £ie f) J:·ut:~ r:{ & T~C.t Y C ll 1915 Anri1 June Jll.. 1 ~/ WI 1 , Z8 0 3 , 560 1 , o ~~o 553 ,zoo ZB , ~~ f35 za , 58~: C' 4""' ~- 7 7; [; 4 G , 6GO r . l) 17 f...., \ ) ~ .) 4 6 , 94~·. 47 ' ~) 2 7 4 7 , J?';.: 4 7 , -J...-, "- 84 4'' _o ~e pt ernbt:; 1' ZS ~.;J i '":, ' ~ 5 ::u1r -0.••"'· E~ /.. G~t\~ -""~ · l~~~~ ;.i.: Oct0ber November April l~J15 r~~iY L l'J1C Jnne lJ~l G 5?'J 37';1 J uly . 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October J:Tove ·nller 1 ~n7 s;-~,554 Hovembe r 11 ~ C>() , l~' ? 0 (~ ' ~-~L~. -J :Jeco 111b er :~SU co ' ;)()7 J°8 TIUf'I.'Y 95 ~: t: 1J ::~ ·tlF T.Jl !.i:t:.r3}1 z: ~3; Ap ril 1 ~1 10~ r.~u. ~; ;:rune Ju1y /U f!'LlSt S0-nte "1ber 1 6 14.- 60 , GU:~ (:)~) , 'o:JLL) 6 1 , : ·2d ~ ., ,:;. -:- " D .L , -· ;_1 ';J 61 , 568 61 , GO? 61 , 611 fiJ. , 617 61 , 6 3 1 6 :tUlI -o~·~· I I1 /JJj_~,~ -~,3~~~ YI~ .·~-R October 3'.7 Hove nbor 54 .:Je(;embe:r 2 ?6 Jell! uF :::-;:r l:H9 t 1 :J ;~J J,. -.!"'-!: ?. :J9 1 .0 Gb !'U 8ry r.'LE :!"C :f! ! .. ~-.:·i l ,June Jul;>' 1 , dOU 6 1 ?: f225 lUZ ~-, b l'..ug·uGt :J se:ite rnber 8 {" Oc to ber n ovember l'i' .:;a CJ ,., .., ,, :Jecember J nrnwry i0 r~o l' 10 21 J,;e brnE<r ;y ;"\_r:e rc :b "~Jll' i l "it~' ~ Tt .. c~'ll ,Jun o r_ ~ o 1.... rJI .:; '7 ?5U 1?5 1 , 090 4.11 Jul ~; 1 05 15 /\ u gnst S ex:i te r!!be :r Octobe r Ho•.rernbe r J_ 9 ;~1 :Dece '·~ber & J :;u1ur.ry 1 ~2~.~ 1 ..::· e ~Jruo ~c y ~.I<= ~~ce11 Gl 070 6 1 ''? r-21; Gl ' ':)~ii 62 ' 0:;17~ ' 4 ~·j ;.:~ I" " O r~ G-1 , G9 C~ 6L_l ' ~105 65 ,120 65 2? 2'· 65 '' 2i) i) ,.,,. :.. 65 ., 65 , ~- 71 c~ o,~. 65 , .f.88 r;: r-: .. 65 ..(_);),.. • •... .... 0 , 4-05 G5 , ? o::~ - ,- 1) r •,.. l) ;) t .J I \) G6 , 62 6 66 , 801 C7 ' t3) 1 68 ' 3() 2 6?-3 , 40'7 ··· ~i8 ' L'"' ~ ;::,,-:. 6 8 , 4'."A ;.:J 68 ' tl-54 68 , 480 C- r 4 '4? t± 6 , i-~<;14 r,r_ , Oi-30 o~ .1\Clt·~ - c· 2ET 1- c<) t.:;o 1 r;z, (.# ..... 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() r~ 15 l -~~ , '/1 G l i) '.~.j l l J ' :):.;;::: 15 , ~:: ·l f...6C) ~=;)() l (J , '/:~:._. l () ' .·i }.·::_-:. 1'76 1 7 , 0 -J ';J 15 0 j_ ~' '_;._;.)? l '1 ' i:) .J. ~· J..7 , 7)7 l7 ,-:.·J7 l b . }.: :~0 ~'jQ r0u ~~() 0 1 ~-, .._. ..L. V : .• 1'71':; l 7 '.-2 15i3 1 .::54 i ;:; ~2 I ..l. :) r;- /.~ '":'" . .J , wOt.J 18 ' 5~·· ? l D , c=:75 ld, f:A·.J 1 8 , ~<; 1 T~e fr ( iil~ua mi le s e,t Devils v.c tur - r)<;::jn. t~- ? tc:J c~·Ji ~bout the "Upner basin is it covt:l'S re_:;---,_ rr e ~ west o"' the Arr·oyo. 30 squvre o" Ebout 6000 ao:r·es. It oxtenus "rotr1 ~~ i::t on'E Cfnyon , ~: rroyo east o" tLe a~ arer ~~ tout 4 mile::; to tLe v:il1::.:f:·e o"' I,< cum:.d c f;bou t 2-B mile s It is 1JonndeC 011 t ho south, "rom Li.: Cc: n;:;;,lic t o ~evil's }Eta, by the SGn Ra"ael Hills ena - rom Devil's G2te to =-:~eton 's Cen,/on , it i.s bom1c;eu b;y 'Tonk's Ei l l Emd u 1 unCle:r - gTound dyke ex'cendint- both v1ost &rnl nortlt - aF;_ st "rom the hill. The water in the Lower 3~sin di re ctly below the ~onk Hill DJhe is ~bout ~00 "eot below the level a~ the w0ter in the Upper B&sin. The urea covered by tbe Lower Bas in is 2bout 18000 Fores. The Lower, or MoiD Pas a dene 3Gsin, i s bounded on t h e n o rtb by the u0per b~s in just Gesuribed: on the west . by r-:n undergro und d;/ke exl:enCi ing- P.lo:ne th0 ,..ro:u J.)evil's G'::te to the ~10uth cit~r <jF t.'i t lirni ts; ln;nlc o,., the 1\rTOJO ~'nci on the soutb .snd e a s t bJ Er;;yT10r:.r} Hi11 c-.nc1 the unde -rf;ro und dyke kno<an H S R~1y­ mond Hill Ly1rn, which extend::> both west i-_ill. The northe{;S t v.rm o~ ~nci nortlle E: Et ":com the tl:.e dyke extends to the :no1.mt:: i n G 15 6t the ~~nt~ Ani tG ~ash , sna a s it pasf es below Sierra ~odre it see f!lS to join with the undergronrn1 base o ~ tlie Y!iOunt£-ins. The undare-ronnd ·water supply i ly drfl wn U"'.10n durinf the ye~~rs I>c1su1enti has been he nv - O -~ ~rom 1917 to 19 ~ 1. a.nd. the water levels in both the upper e nd lower b 8 sins have been stead il~ beco ming lower as shovn b y the curv es o"' water levelo di"'"'erent ~7 ells at the end o" th is p a rt. ~or In the sur:r1mer o ~ 10~: 1 the 'Neter level o ·"' the up11er bt;.sin vr~; r:;: hj_gher than in the sum- mer o ·" 1920 because o" t he W" t e1' -"'ro~;i the l Ete ::csins i:n I;~f'cy 1 9 ::21 being cvugh t behind the Devil' s Ge. te .Dem n:nC. e.lloweci to percolate j_nto tho ground, whereFs in the summe :c o ·N 1921 the water level in the lower P& s~dena ~nsin was the lcrwest it has ever been. According to Chie,.. Engineer S . B . r.~o r ris o"' t11e P a s - &denn 'Ne.ter IJepf.rtment, it tekee the water that is c ~;.ught be - hind the Clam six r-rionths to ,...low underground "rom the u p1:i e r part on the lower basin to the lower part 0 ... t he b Esin . curvec show the e "',..ect t hs t the Devil's Gate LP k e w~)ter l evel in the unde:rgTound brsinc . h~s The upon the There is :::. marke ci ri se in t he level o ·" the Wl'. ter in the welh.\ in the upper b e.sin e. "' ter the vmteTS ~ro m the storms in ~-~Hy l-;l 21 were stored behind the dGm . The . ,..lo0d weters nrorn the storms occuring nrorn Dec - ember 1 921 to !jarch 192 ~? th n t were stored behinc1 the d uP.1 .., ~ l. 0 caused e r Bpid rise in the water level ~n the up9er besin so thst by MD y 1~ 2 2 the wells in this basin showea a water level that w~s the hifhest it haG been in 10 ye Rrs, t he level having r i zen ebout 40 ,...eet in "our' mont hs. T:1-.:i level o -" the 1%ter in the 1owe:r bus in is f:l so rising &.l though at E :n-c;.cl: slower The dete ror the by '.Jr. "Mor-r is. ,...ollo~ing curves w~s k indly nurnish ed 17 ..:...' .:.;_ !- ' • :) () j Sc;: t .. ·~ :) ::, }_:ov . u- . J l "' '(~ ,. ."'\ "!' 0 .~ -= ! -~- :_; . 7 ~. -~ J-~l l1 t:; Ti·L:-: ;3 :~) ~;.__:; ,J <.n . . " [11.. " I 'I'~ :.17 ? ,._ ) . ·.r11·- . Y i r --i T -t -~; ( ' .... ,. f lo r; -, ,-··· ( .L \_i 'f" r· . ,...... -:~ .:. ..; ~J .. ... '...) ._·· .. ~) ~ . Cu t. ___ 71~' 1.J_c.:_' • ~ .,. ' ;) .l ..i. ... ; )"' ' .,_, f i.J ".~. ' _, :'"- ...;i.. .... \...- \... • • '. -.)- J. J 1 0 l .·~ c.. J:· " 1 :) 'i L~ -· v 2·r o--:_. r· . C: 0 t . ! ,.) .·, _.-. ·, ; :'. UV . ~"'- r "'l t : ·- c ~ · eb . . ;'>' , . t n ·r ., .J. .. __..... ... (_I c t " (>c::; t:. 1 ,:-) . •) ....:-· '--" ,. ,. . ( ' ? 1 ~~- . rnG 7 :. "·_i •' 1._; 1._. r; - - ... ' f! ; ) \_' ,.• _. ,_. .:. ..:. ( tl [ Lit.....- _, i1 ::c r: -- c o.\ ,, .. , ::: r 1~"1'i' " _.... n n ...-_/· •....- .•_, : ; •·.f · ,_ ) II T·. ' ~-· ·· :..::.. ;_;' :./ . ·, '~..i _)C-; •J • 1:· r- · 1 "\" .-r (t oc~ t. '.J8;t. ~ i r/ ~: '( 5 '."' ..• :1!, _" -·._;' · 'i' .:; ';::· T.,-!-_;:: y ;.}\;_ l~; )'/ :5 5~ l:!·0~.7 :. ~-; ~~~ ~} !:·'.·O\t :.o • r; .': ~ - _- - 1 :J: - () .Ju l ~' : ' ~) \J ~ ' G ~. l .tl f~.'. J 7L ';} t~ '! 1·:r:. ~,. :~Je U" '1 ( '.) ? ~~ ~ Od t . ~ - i:. ."· t. ..:._)[; .-_ ; ·~ .~J c: .: "01" ·j t; ~ ( _, ,. . - .. ~- .I it;' ... \ _!__) T ., S 5-J i .,.: ~'.Tr·~: .J ;~; 3 --. ,.. June __, (;::; . -: ,. - ri ,~ n r 1 r r./ ; ! ~· : ~ .:.J. .; U ...!.. :J11r1.e 2_; ·~ ~ :__; • ·, ;- r• An r:. l J?C -T~ Yi. . .; ) _, ., Cc; t .. l 7 (.'.:± ~: l ·J ~/(~? n .- , r~ ( l__J I T ;' :: ·~- - • ·- '- ~j J U_JJ. 0 f , -. : 1 ":..1 ,_) ;_) ?1_5 r; ~'.'. 0 ., . . ' ·.....; 71; 7 1 )/ Y' I r ~ .. , I~ L / 0 ) 6 () /. Ll£'.' . ( .i CV o~t . .. i_; l . ._, i .'.·:: y"f("' /' \ I -;: - r · r-· r / ·- C' S e ;:J t o l. 8(;. ·' { , : ? ~~ ? 'i'l? "' .;.;_(... ~/ } :>"!' . '' fl T " " (. .::::0 l..; . C1 c't.~ .: L :l 0 ·"' ( .L \.) _., 1'· .' o' .:- -.- .. ... I" • - =~I t·:·: U • I ... { ,._,· ~· .~ ? C · . , so ·.1 t . ~- Ci ~.r ~-:0~:1 OEIO .~\o b • • ;f .r· .. < . :c . ;3e·1J~ . • ::; !'" . Oct . i. oe . r::·' r1 . })E; ;,j .:!tu~e 1 "':"," ·, f JO 7J') l.) G?tl 6?'.J G?J serit . Oct . 6 :3 ·1 G(I,;, G3f3 67 :J 6 '--iG ~\~C ~i- I C~3 !. lf'O? ?ll ,1 lFlo ? •J.:J o-v·. I'""• r, ~-, i \) (_) !·.~[ ;/ !.U.f: . ;.;co. ~ ·~ 11.~' • Dt; t..! • .. . :-.~ ('_·· - /:Hf', LJe 13. ,:r~1 l~;­ ?CJ;~ }\-:~( ~r ::a[:' . 'i'O;' QrJt -1_!0.,J St::~!t. l_i).l l.>80. 7~)5 I.~ t::' ~{ Oct. 71:_ ;:.;·:.;? .i./ 8 ~: • 7(;5 I."r ~ Oot oJO . 15 . ()C . J.)00 . li r~F ~:- ()01. 1'd 3 6-35 ~"' .'.1!' . 6~5 o~JC _l:1 c; .. _.·eu.J.. .~: (-! (j 676 • !. 1~c .l J J L ;-2 . 4- ?()? _)e .:; • 1 . .:·l~~ . l:Jf.0 ] . ...':;Jr • ...., .-.. . ~.~ t . .. - G~·. ') c,40 6Zd ulO 1 l.:O r' .., i i .L ;J 1 9E l "",.... r1 t) t.~ I rt ..-,, r iJdC,, ~)~ (; ... ..., : ... L,; L ' ~·) ? () ::·. . ~T !Jj -~. ? ~)() .3 ~~! ::: J.1CC l') d () Grl? ,.. ,,. r: l._l() ~e·0 Lo 19li3 !·.i( ·r . . ? ~. CJ ~ " , ,v , rt .-, r \_I 0 T.: D-;/ l ,• .. ~· ~ i. u:.: ;J l)~:::.;j GZ-0 I'" r- . ..: Ut.... rt.·_., ,. r:- 11 Ut...; '::; () ~28 . . . jjec . _,.. ~-, r-, oc.:u 1.D ....·c1J . ..,. oct. 3?G Jllne ::~Jl Fov . ) 'i6 )'J L]_ J).:;c . 6?::f~ ::_,:; c !.,, ,t. ~)) 'j_ - r- r, '.Y :r T t; ,... 0c35 ~rf- 11 • (, ;~5 t), . \ ) z,c 6YJ (;.;'~ ~ _.· ~)r. ') :.10 :JdS ~'.'.F "'j :; ) ) 61 1 } llJ10 6 lZ l: e c~ • J_5 }Jc; c . ?.CJ 61.S ,Tf:n. 1 l Jj_:-~ 61 r•I t.T E.i1.7·\J J.C:·04- ~ :~·;~ . J_3 J.iJ~:.b T.!a~/ ior J 1 l :.1r; r) lC)Q(; RAINJ~LL R~C03~3 ! t is becGU8e of the sc~rcity o~ r8infall in southern Cali ·"'o y:ni~~ r~in •a1 1 thE:t v1ete ~c !:.E's such ~· hi t:h vt::.lue. • or ?as&denF ~or t ho past The vve rage ~ourt y ye~rs is 20.275 '!1his is much h:i.e:her tbC<n in otheT :'.lErts inches ~er t>.nnurn . o• Southern Cali~orniR , t he 8VerUf8 ~or LOB Lnffeles bein~ only Ebout 15 inches and •or San Diago it is less than 10 inches. 0° a~y tion ! period o~ wet ye ars wil l be •011owe6 by a period " years as a rule, Bnd it is because of this prolonf8 - o~ a dry neriod that the water Ca li ·"o:rnit::: is serious . supnly so thet i" f su~~icient water. si tu ~t i on There mus t be per i od o~ ~in in southern ~-.,dequate source o" dry yeErs comes there will be The Devil's Gate Reservoir i3 a great aid in ttis direction, in th~t it holds bEck the -1oods o fl wet ye ar e and thus stores t he vw.t ar underground to be dravm L1y1on ~uring & p e riod a~ dry yeRrs. all wi ll reeah the d&m ~ite Durinf E dry ye~r no wBter Et ao that in tha t csse the under - g:r·ou:nti su:-:i-0ly wil l have to be dr'fl'!i'n nyion or e1se so!:'le otber outside sou rce oa supply ~ound . The - allowing Residu&l ~ass Curve shows how a period oD we t yenrs will be rollowea by R number ofl dry ye ar s. Theso periods ere urobably 10 tears cf more in length but tl::.ey cPnno t be absolutely determined. .An fc.ttemp t VoiES m8de by the wr iter to derive a "'or."'!nlF e;ivin[' the runo -~"' o ·"' a dr n in&.fte rref. in te rms o ·"' tLe f.rmLwl r .<in "'a l 1 end s lope o"' the country, but no such "'ormul a in Sou thern Ca li"'ornia . rn~efrs pos~ible "'or strea~s It might be posui bl e to g et t wo •or - .· mul es, one "'or "loo a. yeE•r s t:=:na £:.nether ·"or orc1 inary yet': rs. f-7 :?e.rt 4. CO:r:TC:O:.USIOHS The conclusion drPmn "ram this rep ort iG that although the Devilrs Gate Reservoir is E great Eid to PEs~denc's water su-p··)ly, e nothe r source o.r> wr.ter or l ater . The re ~re snpnl~r must be "ound sooner possible means or bringing water sever~l ·"rorn otheT wa.ter s heds to serve ?c-s :: den!:: r s needs. these t :i1F.t seernEJ "e ~lsib le iB to ob t ~ tir, One o,. ·Heter "rorrr the J1os fl_ngeles Aq_ueduct En8. store it behind a d.bm constructed at S~rcmnore ine to Ct=myon . ~ng ine er The re is e. goou dbm sit e there ~m ci i:;. coord'.:.. Io'Tor:ris o,.. the P t: = :.:;c.ciern :. '.7f•ter DepE~ rtrrwnt, c-~ dRm 200 "eet high,ore l" tinf F reservoir vd.th ·l o :c 5 times the ccipe.cit;7 o'" the Devil's Gt:te Lhke , collld be bnilt o" ~2,000,000 ,..or storing this wnter . Althoup~ 13-ree.t e.rn.ount o ~ ViD.ter "ror:; this ac.:,u&ci uct be:.\.n3' t ~ .. cost h there is c: llovie'-~ ~ to "lov_; into the SC[' er.c i1 yenr theTe wou1d e.pp1:1rentl:1 be di" - "iculty in fatting Los Anfeles to let P&sedena hrve this tnother possible source is to buila a dem in the Te - water . jinfS Creek rnd by meons o~ about two and one - hal~ miles 0° tunnels bring· the v.:Fter to Pt"' SFdena. Los ~nBeles has a hold on the ~os sib1e Tejine~. tho :nresent ti:ne End even i- it were to obtain the vwte:r rigi:ts '"rom Los would be a very expensive nroject nels. f .t The Te j <lllZ& is F bec~:u:-;e .!'~ngeles it o,. t.t.e lontt tun- poor wP ter yiroduci::::1e- v::ce i:. ::~ncl it hEH:3 only about ono-thirci the TQno rr ~er squere mi l e that the 3~n ·.v est -.. ork bcH;E· Uf30 the clouds c ~~ tcl~ u po n the 11if!::. ric~e;e in -"ront. · The v.1eter -ram the St··n Gul:r:Lel vYc ter -shed ~ i@· ht c.lso be br ou ght to serve P~s&den~'s needs, but the construction oc~ CH'!!'. '.'IOUld be 8X08TISiV e bec F.1.lS8 0 - the '\:riv t.'OOd c.lrm Si tee. Ptill c nothe r d1 t: invgo ~re ~ nee r P · s~fiene that is n ot util - ized cs y et -or .,-,E,t,:n· SU) '~l,1 ii:> the V':~ ter - sheu f- :r·ourn1 Lit t le Jo:.<r Lr ke . :Li>c r:10G t o - the othe1· pro je cts this e. lso h<..:.s its ftFults, t he mt i n trouble bu ing becEuse ofl tLe a~o1u1ts a~ exc e s~ive tunne l s thet ~ o uld l1a v e to be construc to5 to br ing the ~nter to Pussden e . It s e ems evident th2t uo~e ad6 itiansl so~rce o- w~ter SUD') ly must be r)rocure d i.n t:iw ne Er "u tu:ce , rr,Lt I ·"i:::-rnl;;r be lie v e thut some o" the but it •r;on1f' t c ]-:: e ~, ~bove rro je ctE c ould berve this neea , cc:re "u1 investie:ation into e ach one to - i nHlly dctenr..i!.le wh i.:::h one i s tLo bes t. _fl_ .?OR:i:I O!T O'"' l'HE IU!:'Oii.T BY CHI E-,,, CITY MANAGER , G.TI.KOIDER , S3?T - 30 rytT~R CONSTI RV ~TION Ber ·ihni.nc with ,h.m:w:r;y, l.Jl4 , the lie D<.rtrnent .h&s 1 "loOl~ Vff; teri:; snre ~ia on tLe g:rvve lf; o ,.. the .1'..rroyo Se oo belo•;r tl1e mouth nrov i de P1ore Virt er to be U;J._ en out 1,f:L:Ln eit :Cwr b;y p.·rt=Jv i ty arn.:.i t hroue:h l.':bout e. :nile o,. tunne ls a t :Devil 1 s G·t::te or b;y the sev - ,..ollowin? t nbJo shows the quLntity o,... w~ ter con~e:rved in e~ch yeFr jr1 o"" " ro~ this manner in 2 ddition to the lG.4 squEre miles a~ percoletion in nor~8l Arroyo seco c ~nyon es me&sur0ti bJ the U:n.i teu st e.tes Geologice1 surv0;; : Ye f:T 3 n d ing Rfci1: ·"'~ ;,J l in ~rter spre~d on Gr~vels: Runofl ~ June ZO Ino1~es Cub ic ....!;eet .Lcre .F eet 1 Jl4 74.lt-: z~· ~ r :°' r'I <' C..1 ~ " °'-ii:.: 2 .~-~60 1 :i1G 1'01? z.,~, 50 8 ' (,.~() l i.l , 90J 5 , 58 -2: 1 91:3 }.:5 • ()'J 19 • 0£3 1 9 • C3 ?: u :; .6 1 14 ? ,zoo ,000 106,000 , OCh-.l J.!± 5 ''700 , 000 1 07 •oco ' 00 ·~) z . z;:JO .L ';:; - .D l'.)20 1 9.ZSJ 51 ,5 UO , OC}·J 1 , H 34 Li21 1 ~) .41 1:::: ,8}8,000 .;;:Jo 6 22 , d <~ O , 006 Aver &fe 2 yerrs - ----- - - - --77 , 8 52 , 000 T4 ,?;21 1 ''i"-30 .., '..l l 1 ~ns In very f:1 c1 c1 i tion bons ~ici~l to tr,e ;-:g ,ouo .ooo lf. , .:_1.?0 , OOJ wt=-teJ~ C> A I~ f.'\ t., , ·~· U\..1 8~5 (""'; "", , . conse rv eci b;y- v1&tor 16.4 SQ. r~i. .!\.c . 1 t. ,ooo 1 5,618 i , 0r.2 z, , Gz·.;s not c orrr::iiled sp~' OH~ ing , e--ect wrs obteined b y the Devil's Q&te DEm 31 The GJ, ?CJO , 000 cubic Jl['.st ser-son clonn the Lrroyo seoo. ~ae"G, bes in L1've beer. hie·hE:T this summer th.~ n l est ~'eEr, v;tile in tt:e lo·~rnr or R[~;y-:'YlonJ Eill Bcsin tlw wcter }1r:s been lovwT t!H:ln in eny previous yeEr. o~ ~upervisors Dis trict in there wes 2nd the Chie~ inst~ll i ng En[in0er oa the Jlooa contro l te~por ~ ry wooden coll8psibl~ gvtes when time i•nc'.i '"unds ·-or the nJ.f.':c'i11t o-C' tbe insu L·~icient permenent gvtes thFt the -iood w£ters were held back end per rni ttea to penetrate into the underground now be en ~or contract has b ~ sin. hy the District to the Ll ewel lyn Iron aw~rded ~orks the construction end instalJetion o~ tha ~ermanent hy- dreul i c~ll~ oper~ted be""ore the next steol ~ a tes which ~re to be inatslle6 wi~ter . :;_:,:~VIL I '3 :During t he yi[1f:it G/ TB TUFlIBLS ye<:r the V'Ork o" conoreting the timtered sections o,.. the main lievil' s Q['te Tunnels Vi~.i s complete((. involveJ t he lining with concre t e o• 2706 the lin i ~ff ~eet a~ tunnels snd and in some cases sinking and lininf oD 10~~ o" tunnel she:; ,..t s . Th is ~eat :Now ~0 11. thiG con-:;r·ete v;ork is completec'l [;nC: the tunnel s ere ~repared to sspely st~nd the addition~l strain which will be put upon them when the Devil ' s GEte Reservoir is "illed. ra~ i dly stresm bed a~ Th2t ~ortion a~ the tunnels p ase inf under the the Arroyo Seco w£s bulkheaded or~ with concret ~ in or6er to "orce greeter piltrPt ion be pore any "load wcters (~ cm Ylenetrnte into the tunne ls F'nCi ·"lov; reservoirs. through the gr8vel into the tunnels , PercoJ~tion however , proved so r <:<p id c "'ter tlle plood dEm thflt it wca necessFr~ severa l days until tLe the cii.st:ri bution ir~to to shut ~~ter or ~ wf.:. ter rec chefl the the tunnel w~ter "or cle2red up bfDin. The Pc tivities in developinf our ~rese~t urderf~OQnG vd.ditionE.l wells anc1 by tLe ins tE:ll[, tion •rffteT :i:·c:;so1nces by o" dee~• ·Ne ll pumns in in f to P~saaene's tr~e nl~: ce 9er~~nent o" "9it t;ype o" pmnps is c.1ot vdC:- wa ter supnly , but it does mcka 0rocurement o ·,.. '<vnter J. ocall;y ·,nore e ,..,..icient 1:md el':l':bles the City to pass more scpely throuet R short cycle o" dry Procuroment o"' a permanent add itional source o " w~ter ye~rs. sup!.)ly is eoso1utely necessi::ry to the I!lf-intenE. nce o"' oui?J pre0 sent City development. This m8 tte r is now receivinf t he ser- ious considerution ~nd study o,.. the City admin istration, Fnd I knov1 it is not neceseery to purt hcr emphasize the -"ect here. Too much hope 0a.nnot be 9lDceCi i n tho relie " o r""ered by the c onstruct io n o,.. the Devil 1 s GHte D~m a s the but 30 S(iUi':re The e nnut~ l o,.. Vl[' ter by this Deprrtment itsel,.. is neErly two times the sur "nee c v pee i ty o,. the Devil ' s G&te P.ese:rv o ir ~ dry ~ rea miles is not su·""icient to t &ke care o"" t he de- marn1 s o" P[~ sad ena P nd surTound ing a :ceas . supplie~ drein0~e se~son no ~~ ter re &ches the Gem s i te at ~ 11. During· e very