LADM-NO 1130-2-23 San Antonio Dam FCB OM Manual 02-1960.pdf

LADM NO. 1130-2-23

SANTA ANA RIVER BASIN,CALIFORNPA

OPERATION AND MAINTENANCE MANUAL

FOR

OPERATIONS

SAN ANTONIO AND CHINO CREEKS IMPROVEMENT

SAN ANTONIO DAM

U. S. ARMY ENGINEER DISVRICT,LOS ANRIGELES

CORPS OF ENGINEERS

FEBRUARY 1960

3. S , AZCf EIJGIIJZER DISTRICT, ZOC AKGEL&S

CORPS OE' E'IGlrA!L;E%

OPERATION MID KADqmAPaCE IJXNUAL

FOR

SAN r n T O N I 0 DAI4

SAN 5FlTOiglO AND CHTEJO CIEEXS IblPXOm~%P.JT

SANTA ANA FCLV'ER WIN, C-M.IFQRiiA

PREPARED UNDZR TIU D1RF:CTION OF

APPmm BY SOUTH PACIFIC UPVTSZCXT

21 OCTOIXR 1959

U. S. Aill~iY ENGINEER DISTRICT, LOS ANCELES, FSBRUARY 1960

F O R E W O R D

1. This manual prescribes standard ppoeedures f o r the operation and maintenance of the federa l ly constructed San Antonio Dm, Los Angeles County Drainage Area, California. A l l previously issued operation and maintenance manuals f o r t h i s dam a r e superseded by t h i s manual.

2. The Dams Section, Design Branch, Engineering Division, i s responsible f o r the preparation of this manual and f o r k e e p i n ~ it up-to-date. Suggested revis ions should be forwarded through channels t o t ha t section.

Lt. Colonel, Corps of ~n.ginee& Deputy D i s t r i c t Engineer

TABLE QH CQNTFJTS

SECTION 2 . I~PRODUCTZBN

AuLeh~rfzatfon. .........~.....................O Project location m . b . e ~ ~ b ~ . . a ~ ~ ~ ~ a L ~ . e e ~ . e B a ~ e D C O B . ~ . ~ ~ a ~ ~ . ~ 1 Principal structure^^^^^..^^^^^^^^^^^^^.^.^^^^^.^.^.^^ a . 1 Protection provided Design analyses ............................................ 3 ..................................... Construction history.. 3 Foundation of San Antonio Dam S i t e Topography ~ . . ~ . ~ ~ ~ ~ b ~ ~ L b b . . b ~ D Y U O O ~ O s O a e e e o e e a e ~ ~ e a ~ a ~ e ~ ~ 6 e 15 ........................ Hydrometeorological character is t ies 6 Pertinent data.. ~ ~ ~ ~ o ~ e e ~ e o ~ a O ~ ~ e ~ ~ e a . e ~ . e e ~ m ~ ~ e ~ ~ ~ ~ ~ ~ ~ ~ . ~ ~ '1

SECTION 2 . GENERAL PROCEDURES

Approved regulations . . e b b . b . * * * b e m e * * e * . b a a a e e e a 9 Furpose of manual ~ . ~ ~ m ~ b b ~ ~ b ~ ~ . ~ u e o ~ ~ a o o e ~ a e e ~ o ~ a m a ~ . ~ e ~ 3 . . 9 Definitions ~ ~ . ~ ~ b . ~ ~ m b . ~ ~ b b ~ ~ e ~ ~ ~ b a ~ a d a B e b b b o 9 Referenoe drawings and manuals ............................. -10 Functions of the Construction Division Functions of the &gineering Division ...................... 10 ... Joint funations of Conetruation & Engineering Divit3ion.. 11 Duties of the damtender F'unctions of the U.S. Geologioal Survey Training of key personnel. ......a.b Prevention of encroaahment or trespass Permits for entry or use of rights-of-way ............O Routine inspeations and maintenance .......................O 13 a . Periodic routine spect ti on^..........^..^^ b . hspeotion and servicing of gagas .................... 14.

c. Ebgineering inspection. .............................. 1 L

d. Safety Branah inapestLon

Routine t e s t operations. ..e Repofis ~ ~ ~ . ~ ~ ~ ~ ~ e e ~ e e a O e b ~ ~ b . e . ~ ~ ~ ~ b ~ m b m b . 15

SECTION 3 . ~ ~ T I 0 9 R AREA AND EN3ANKMENT

mm * * . . * * * . * * * * * . * * . * . a * * ~ ~ o e a e c , a * * * ~ o . * * . * * * * * . * * * * . * * * . * .

Access r ~ a d ~ . o ~ e e ~ e e u ~ ~ e e . r n e

Control house ...............b.................e Thubankment drainage Uti l i ty gallery ........................Do Ut i l i t i e s * ~ * * m . b ~ ~ * * b b * m . . * e . * . * * b . . ~ ~ e e e e a a ~ e e ~ a * * * * . * a . City of Upland pipeline b . Canon Water Company pipeline c . San Antonio Water Company pipeline

Inspactions and mbnteabance a . Jbbankments ........e....................e

TABLE OF CONTENTS.. Cgu'at.inue&!

Paragraph SECTION 3 RESERVOIR A R A AND EJWbi:d%mYT . Contd

3-08 b. Concrete and riprap.. .............................. ............................. . c Access roads and bema . ................................~. d Burrowing anfmale ............................. B Hazardous o b s t m ~ t i o n s f vehioles and equipment

SECTION 4 - OUTLE!E WQm

General features Approach channel Intake struoture Access gallery ............................................. .............................................. Gate a i r vente Conduit transition Outlet conduit . . . a . . b ~ Q ~ G 9 . ~ e . e ~ ~ ~ ~ ~ ~ . . . ~ C e ~ . ~ e ~ e e e o ~ ~ . . o .

Outlet charnel .........O Float reoorder weU ..e Drabage ................................................... .............................. Inspections and maintenanae...

8 . Cbamels .......* b . Drain pipes ..............e...............O

SECTION 5 . SPILLMAY

Description ..............................................e.

Approach channel .................a.m.aee............... . C O O *

0gee L e f Q g ~ ~ i t y block ......a.....oa..e..............eo.o.....a Right pavity block Side charnel . . . e e ~ ~ ~ . . . ~ o ~ . . a b ~ ~ ~ . ~ ~ D ~ O O O Q Q O e e ~ . . ~

Downatseam channel ....e.....................e Buoket Drahage . b B O O e G B P e ~ ~ . b ~ ~ . ~ ~ ~ ~ ~ . e e m ~ ~ O O a ~ . ~ ~ ~ ~ . e b b . ~ ~ u o o a o a Q

Fences ........................~~...................~...8...

Inspeotions and Maintenance ~ a ~ ~ ~ . ~ ~ . . ~ . . ~ . . ~ ~ e O O O O ( I e Y ~ O . e e o

EL* Drainage

6.0% Geno~ab featwe8 ~ . ~ ~ . ~ o . D O O D O F ) Q ~ e o ~ ~ ~ ~ ~ ~ ~ ~ ~ e ~ ~ e ~ ~ a o a o ~ ~ ~ ~ * *

a. Conduit l lnere and bomet.. .............O bo Gate leaf......... ........................~~a...... .......................... c . Bearing strips.........'.. .......................... d . Gate leaf stem and nuts.. ..... o . Bonnet cover... ...~......DOOeO~OBaa.~....C1... ....................... f. Roist cylinders and pfst~n8~

6-02 Operating equipment . . . . * . . e . . O e c . . . . . . H . . . . . . w e e e o B . * . .

a. Hydraulic.. ...e...e

SECTlON 6 . GATES . G~ntd

. ...........*.........*.**.*............. .c n e c t r i c d 33 Gate operations .......................................... 3d Inspections. t e s t s and maintenance .................O..... 34.

a . General be @ t e ~ . m e ~ s ~ m e e e e e a . m a ~ ~ o e e ~ o e ~ . ~ e ~ a e . ~ e o e e o 35 ............................... oe bdiba tors & MaSoro 35 .......................................... a,, Pajntfag 35

SECTION 7 . ELECTRICAL FACILITIES

Electr ical mpply and s e m i c e ~ . .......................... 37 ..................................... Standby power unit.. 37 .................................. Generator c o n t r ~ 1 panel 37 ........................................... Light f ixtures 38 transformer^ ........................................... 38 ....................... Inspections. t e s t a and maintenance 38 a . Bnera l ............................O.............. 38 ........................... b . Electrical supply l ines 39 c . Standby power un i t d . Generator oontrol panel and fixture^......^....... 40 . e Operation of e l ea t r i ca l facilities ................ .40 ............. . f Transferring plant t o standby service 40 . g Transferring plant t o Edison service h . Shutting down power plant during emergenoite~.,,~,, 42

SECTION 8 . HYDROGRAPHIC INSTALLATIONS

Gener8rlo.e ............................................... &?

Staff gages Resemo%r water stage recorder .................a....a.... 4.2 Gate poeition reaorders.. .....OO.O...............OO Gate position indicatore..... ............................ 4.2 ................................... Outflow gaging s tat ion 43 ....................................... Standard rain gage 43 Automatic rah gage.. .................................... 43 .................................. S d b e n t a t l o n monuments 43 Inapeotione. sez-vici.n@t, maintenance and regostiag.,., , , , , 4.4

a. By the damtendler...o.o..eOOOOOOOeBO ............... 4-4 .................. b a By the U . 9 . Geologioal survey.. 44 00 By the m i n e e r i n g Division ...................a..a 4L

SECTION FACILITIES

.......................................... Radio station.. 45 TelephoneeoOBeO ~ e a e ~ ~ ~ a e ~ ~ ~ e a ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 45 Mabtemmoe sf radio f a a i l i t i e s

TABLE OF CONTmTS.. Continued

SECTION 9 . COi.II.RINTCATION FACILITIES . Contd

9.04, lllaintenaece of commercial telephone em ice...........^^ 45 9-05 Maintenance of intercommunication telephone service

SECTION 10 . WATER SUPPLY AND SEMAGE

Watersupplysystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . .a . .e Sewage system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O.. . . . . . . . . h7 Snspections and maintenance a . . e . ~ . * e . e . e . e . a e e ~ 8 e d 0 e o o.d 47

SECTION 11 . FIIULFIGrHTING EQUPX-T AHD FPW 3UmTI8N

Control house. . . . . . . . . . . . . . .m Access gallery . . . . . . . . . . . . . . . . . . . . . . . . .*. . . . . .O kspections. testa. and maintemce a . Fire extinguishere .............................. 49 . d m b Fire hoses and bLbbs.... .....................* 50 ................................. c. Fire prevention 50

SECTION 12 . SPECIAL N3JUIItEBBNTS DURING HIGH-WATER PERIQDS

6Rneral . .0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~ 51 Reservoir regulation.. Q B ~ ~ e e ~ e c B ~ s s ~ e m ~ c e c e o * ~ e ~ O e . 51 Flood-emergency prepration patrol^.^ Fled warning Mobilization . . . . . . . . . . . . . . . . . . . . .m Notification of reservoir r e l e a a e a . o Q ~ , ~ 0 4 0 P 0 0 B a O O D O 0 0 0 0 53

Title - A Wojeot leeation B General. plan 6 %nspeotion oheck lists

No. 1 Embankment No. 2 Outlet works NO* 3 Spillway NO, !: Gates and standby unit NO* 5 l-lydrographie installations & c o d c a t i o n f ac i l i t i e s No. 6 ! .~ sce l lmssus

D Test operation reports E General Safety Requireinsnts, Corps of Engineers, U, S, Amy, EM 385-1-1, 13 Ekrch 1558

F Drawinga (unattached) G Reference mtnud~!

No. 1 1956 Safety program No, 2 Instructions for operation of gates No. 3 Buda-Mesel, Inetructions for operating and servicing Model 6DA-779 No. 4 Enternational Power Unit, Gperatorls Xanual No. 5 Inclined Elevator, Coast &levator Company

$33y1J9 \,!QRKS

-I 1 - P..ILE NO 4 B l ) TITLE

P ~ s j e c t Locatiors: and Index Lo Drawingo RaFnPrill Data -- U,S. Weather Bureau, Cbai-enont, C,&1ino Hydrograph -- San Antonio Gsoek F o ~ ~ d a t l o n Zxploration Plan, Profi le askd Ssottiaa Approach Chamel - Reinforcement Details Intake Structure -- Dimensional Detsils Intake Struoture -- RoLnfsrcement Details No, B

Stsuotuas -- IRelnforcsment Dotails No. 2 Conduit Trsnsiti~n Detafis Conduit Seotions Rubber Jo in t Seal Details Trash Iiacks 9c Moo, Metd. Details Mator Line Rebscati~n

5 9 . 4 g x 101-0" SLIDE GATES P r o j w t Loeatlosl and Index t o Drakrlngg ~enerd . Plan Gate Eilockout -- Relnfomsmont DoLaXLs Gate Assembly Upstream F m e Ds~mstraarn Frame Upstroam and Downstream EbmeO;

Bonnet Cover Cate Leaf Frsme and Lsaf Seals Gate Hoist CylLndcr Gate Position B-dicatss Gate Vent Pipe

MBLLN-T, SPUldAY AND COEfLPLBTIClM OF

OUTLET MOMS -

h d e x ts Contract DrawLngs - Pro3 ec t Laca t ion Rainfall Data Elydrographs Pomdatlon Eqlorat f on PIm Geology E q l 0 -- Right Abutment and Spillima- SoUs and Geology -- Logs No. 1 Soills and Geology -- Logs No, 2 Soi l s and Cb~l~a Logs Noo 3 h b a n h u n t - U t a i t y R~Zocat isn Ut i l i ty Gallsay - Plan, Profile a d Section Ut i l i t y W s q - Mfac. Details San -Antonio Watar Co. - b l w a t i o n Details No, 1 %a Water Co. -- Relocation DetaUs No. 2

, Canyon \dater CQ, - R Q ~ o c ~ ~ ~ Q ~ Detail8

[;! ,fg Ti"'<',L3 :,i i,, Plan and Prof i l s

Cbnnol Typical RsinforcsnentArrangenent

Excavation Crosa Section

Subsurhcu Drainage Detail8 No. 2 Prossuro Gage znd Pieaometer Tube I l s s ~ .

CWLZTION OF QUTLET WORKS

Float Racorder Intake Detaile

Cants02 House - Sanitar i Syotcxn

Control HOWO - Iiydr. Control Cabinet Details

Guard bil and Gate Details

OPERATION AND IJAINTENANCE MANUAL

F O R

SAM ANTONIO AMD CHINO CREEKS IMPROVEMENT

SAM r n 0 N I O Dm

SAHTA AM RIVER BASIN, @AEI .FOWU

SECTION 1

INTROWCT I Q N

1-01. Authorization.--The plan of improvement f o r the control of floods on Stan Ihntan%.o and 9hbo Creeke, a8 descs$bd In House Document

No. 688, Seventy-Put$ Congress, Third Seslsfon, was adlop%& by Act, sf eongreae (Public Law 761, Seventy-fifth Clongress, Third Session, B. 8, 10618) and approved 28 June 1938.

W

1-02 . .&n Antonio Ram is a flood and debris regulating reservoir whiah, i n sombinatfon with the San Antonio and Chino

Creeks ahamel imp~ovemnt, p ~ s v i d e s f o r the usntaol sf floods oa %in

Antonio and CMno Creeks, The a f t e of -%a Antonio Dam is on %a Antossis

Creek a t the boundary of Eos Angeles and Sari Bernardfno Courat%es, California, about 30 miles east of Loe Angeles, 22 miles west of San

Bernardino, and a t the aanyon mouth through which §an Antonio Creek emerges f r o m t h e SanGabr i imaun tahs . The location of the project is ahown in Ekhibit A.

1-03. Principal s tnnotwe~~--The principal a tmc twea csrasist of the e m a e n t , the spillway and the out le t work$.

The earth fill embanbent f a 3,820 f e e t long with top elevation

J 2,2668 the rnaxhm height above streambed is 160 feet .

( 1 - Par. 1-03 Gontd

The spbllway i s benched i n t o rock in t h e r fgh t abutment and consists of a concrete ogee, 200 f e e t long, with a concrete roetangular s i d e channel, 909 fee t in length, %ermSnaLing in a 75-foot radiu8 f l i p bucket, (See pas, 5-01, page 26)

The ou t l e t works 3e bsnohed i n t o rock a t t h e t oe of t he r fgh t abutment and consis ts of an in take with three gated opmhgs, 5 f e e t

8 inches wide by 10 f e e t high, converging i n t o a c i r au l a r concrete conduit

14.5 f e e t i n diameter which extends under the dam embankment 4x1 discharge in an open rectangular ohannel. The overa l l length of t h s c l o a d aoctfon is 621 f ee t , The gate sills are a t elevation 2125, 0 Protection prov$decE.--Because of' the tendency ~f Sari A J I % O ~ ~ ~

Creek t o alter i ts course on the debr i s cone below the mouth of San Antonis

Canyon, an area of 57,000 acres of highly improved ag r i cu l t u r a l property and valuable res iden t ia l , oornmercfal and i ndus t r i a l property i n t h e c i t i e s of Pomona, Claremont, Chino, Ontario and Upland i s protected against overflow and damage.

The p ~ b c f p e r l eas tern transporkitbow goutlet from %he LOB awgeass eroe and ita W b o s is through e gap between t he Elan Gabriel Mountains on t he north and the Pueate, AfPPs on t h e south. §an Antonio and Chfno Creeks

- - fl-thad aamas ~ a @ h t - & b u t h e ~ P a & f p e a&Unlen-Paciffc

Railroads cross t he overflow area j u s t e a s t of Pomona, md t he Santa Fe

Railway crosses ea s t of the City of Claremont. The Pac i f ic E lec t r i c

Railway, a l o c a l e a r r i e r of large q m t i t i e o sf reloaded t m n ~ c s n t d n e n t e l f re igh t , a l s o orosaes east sf Clasemsnt, The railroad t r a f f i c represents a t beast 88 percent of all eaet-west t ranscont inenta l t r a f f i c enthring

Par, 1-04 Contd or leaving the general kos "bgeles area. Four trmscontinental highways roade and s t r ee t s croee the flood plain, The lasgs s t ee l a i l l a , which ars only a few dies eas t sf the overflaw area, wxi4,d be sor%ously effecce.1-i f the t m s p o r t a t i o n syeteme a h a U be b%ersupted in tPle overfle~a area.

Two extremely imporbmt high-power transIP9ssfon Pfnee crose the overflow areat One from Hoover Dam t o Loe Angeles and the other from Hoover D m t o

Sen Diego. A l l of these f a c i l i t i e s would be damaged and the service would be disrupted i n the event of a large flood, if not proteat& by the Sarr

Antonio Dam.

1-85. & s i m . B a e a . - - D e t a i l e d de~cr ip t iona 4 esmputat%ons ere given in the following reposts iesueQI by the Cospe ~f Ehgheara, U. S. Amy

E n g h e e ~ D i ~ t r i o t , Les hgelese

Hhd.ysia of Design on Sari Antonio andl Chino Creeks Impr~vemaent, Sen Antonio Dam, Outlet Works," dated January 1952

"Design Memorendtam No. 1 su Sari Antonio mid Chino Creeks bpssvenon%, San Antonio Dam, Spillway," dated January 1953

"Design Memorandum No. 2 on San Antonio and Chino Creeks Improvenont, Sen Antonio Dm, Embankment and Completion of Outlet WoskaBn dated January 1954

"Analyeie of Design an Saa Antonis and Chino Creeks hprovement, SaPl Antonio Dam, 5f-8nx101-0n Slide Gates," dated May 1953 contracte, aopies of whioh are on f i l e i n the Office of' the Distrio%

Engineer, Loe Angeles Dis t r ic t , C s q o of Engineers, Lo@ hgebe8, C d A f ~ f n f a .

Par, 1-C6 Contd, 0 - Pertinent data an the major contracts are as follows:

a. ,Outlet Works

Contractors K. B, Nicholas Contract Number: DA-18gq-CIVERG 52-25 Work started: Xl April 1952 Work completed: 6 lkruh 1933

Contractor: Petrolem Comtmacticra Cmpmy, Compt~nr , Galifomla Contract EJrrmber: DA-04-353-Bg-3160 Uork ataPted: Deczaraber 1953 Work campleted: 22 December I954 Aeaeptd by the Wted States: 31 January 1955

c. Rnbankmat, Spillway and ComFjletion of' Outlet Works

Contsactort Winston Bros. C o w Contract W r t DA-0&35sE$g-3190 Work started: Wch 1954 Work completdn February 1956 Accepted by the United Stateat 1 May 1956

1-07. Foundation of Sa. Antonio Bmsftet-Bedrock along the outlet wsrb C B ~ L S ~ S ~ B chiefly of: closely fractured banded g ~ e i s s , wh.ich e-xt&s

9a mere or less uont inum expostrre~ 619- each side of the road cut am1 is covered withia the paved road ere& with road building nrateriab. The greater part of the bedrock near the aurface along the outlet works is deeply weathard and is cut by minor fau l t s and shear planes. Hwever, hard, un-weathered gneiss occura locally above the subgrade of the &te s t r ~ e t ~ a in surface exposures nearby.

OlperMm materLab aacw wLth%ls the limits of the outlet construction

Ln arsLy two smPP areas: (1) a t the upstream end of the approach channel where coarse streambed alluvium covers the bedrock t o a depth of several feet below subgrade, and (2) along t he west side of the out let works, where

Par, 2-87 Cslstd.

a small area of s l ide material covers the bedrock t o a ahallow depth.

The out let works is founded on f i r m t o hard bedrock, except for the upstream portion of the approach charnel, where the overburden materiala below subgrade are rsplaoed by eonerete, The spillway sits ia.on a terraas of Oldes alluvium, which Older a%Luvim consists of" oxidized, well-coneolidated, coarse t o f ine materials tha t a re in various stages of decomposition, The loaations f o r the various spillway structures ware selected so a s t o provide rock foundations where required.

The ent i re ogee section and djacsent gmvity block8 BPQ f8z22%de13 0 ~ 3 c l o ~ e l y fmattssed banded gneiss and granite of various degrees aL'hhr,&ess, The greater part 0% the spillway cb_amel i s Pounded on rock. The foundation, rock between the upstream end of the channel, s ta t ion 7+Q, and s tat ion U+O0 approxhately, is closely fractured gneiss, schis t , and m i t e .

The reach of channel between s tat ions U+00 and 16-60 along thw ~ i g h t w a l l , and etation 14t30 and b6WO along the l e f t wall is founded e-;l Older hl11p~vim~

The epillway bu~Be% %e f0~1l1dsd on clseely fmcLwed gneiss, which i s weathered but f i r m .

1-08. Topomaphy.-The drainage area above the s i t e of San Antonio

Dam comprises some of the most rugged mountains and some of the most precipitous canyons i n southern California, The p rhc ipa1 canyon QSD

Antonio Canyon) through whiah the main stream flaws, extends geaemEly wo~%heast - southwest along the long axis 0% the drainage area. Elevations

Par. 1-08 Contd.

in the drainage area vary from about '2,150 f e e t above aea level a-b %fie mouth of San AnnSonSo canyon to more thm 16,800 Pee$ at San Antonio Peak

0x1 the nsrthwes t boundary.

The so i l s , which a r e mostly residual, are ooarse, porous, rocky and generally ehaPPow. Large areas of decomposed and &isintegrated bedro~k are exposed, Qrowth of fir, pine and spruae ocaur mostly i n the upper p r t of tho drainage area above the site of San Antonio Dann, Moat sf the bower of the area i s eove~ed with heavy growth of. brush, boluding eumao, mom-

$a* mhsgaay, c h a p s w l , and elharnise. Sycamores and alders grow along the stmams, a8d sorub oaks grow in sheltered areas on the north sPopss

0% tr923utq myons .

Cliraatiu aonditflone in the drainage area generally vary with e L ~ v ~ " i r ~ i o n ~

The climate is temperate and humid a t the higher e%evatisne, whioh are nner~ely i n the upstream part of the area, and I r a mbtsopiaal sad subhumid at the lower elevations at and near the Antonio Dam s f te , 1-03 Wdrsmeteoroloa%cal charac t e r i s t l c s .-Most preaipitation i n the drainage area resu l t s from general w h t e r storms. During the months of November t o April, auah a t o m move south over the ocean and then inland t o southern California and r e su l t in preaigitation over large areas, Thunderstorms, which ma^^ r e su l t i n intense preolpita%ion during shark pe~iod..;

over small areas, such sa the dmimge area abave tho %n Antonio Dam s f t e , osour oocaeionally e i the r in assooh%%en with general storm or independently, S-~T thwderstoms are Wrequent , Rm~fff concentrates quickly from the steep s l o p c of t he drainage area, Eiigh intensi ty ra infa l l , fn combination with the effects of s t s o p gradients and occasional denudation of the area by f i r e , resu2-k %n intense debris-laden floodsr

1 1 0 Pertinent data, ANTONIO DAM

1, DraSnane area sq. miles 26.7

2 , Reservoir desfm flood Peak inflow Volume (maxtrmun 4.8 kmrs) Controlled outflow

3, Spillway design flood Peak inflow Volume ( to ta l h ~ ~ ~ t i ) Peak outflow cof a s . 19,000 acre-f ae t 22,500 ~ . f 08. 8,500

0.f 0 8 0 60,000 acre-f eat 18,500 C o f me. 53, '760

4 . &g Type earth f i l l Crest elevatim- ~n.e.1, feet 2,260 lkxbnm height above s t r e a b e d f e e t 100 Crest length feet 3, $50

Cre8t length Crest elevation m,s.l.

Height of ogee (above approach channel) Surcharge above crest , spillway design f lo& Channel width Channel length

6, Outlet works Type Type of gates Type of gate Number of openings Size of openings Number of gates Conduit diameter

Conmete ogee with side cheulnel feet 200 f e e t 2,238 fee t 10 f e e t 16.9 f e e t varies 80 t o 50 feet 909

Gated concrete conduit sli do hyd&ic three f e e t 5.67 x 10 three f e e t 14.5

Par 1-10 Contd

6, Outlet works-continued

Gate stmctume and conduit losngth Gate sill elevation m.s .1 .

Invert elevation, downstreann end of conduit, m.s .1 , Conduit capc i ty , gates fu l ly span, water 8wTiac3e a t epillway arest

7 , Raservoir Length (maximxn water surface elevation) Storage allocation below spillway creetx

&Flood control Debris (exclusive of that cont&Lnid fn reservoir desPgn flood)

8, p e a and c a w c i t y tabulatilont Elevation feet.m,s,l, Spillway oreet 2,238 Haximum water surface, 2,254.5 Top of dam 2,260 feet 621 feet 2,125 feet 2,044.05 cubic yards 3,226,000

Ares - Gross capacity BOTBB - acre-f eet U3 9,285 161 11,880 164 12,715

SECTION 2

2-01. -0

Engineering Y m u d f o r C i v i l Works, Flood Emergency E~Rmd, Lss h g e l e s Biatr3.ct.

Fire Hghters Training Manual, General Safety Requirements, Coma of bgineers , U, S, Army, EM 385-1-1, 13 Y.&Tc~ 1958.

Xotor Veh3.cle Illgpection - Technical IJanual 38-660-1 Operatorts Ydntenance Instructione & Procedures f o r Administrative lwbtor Vehicles, L6 Apri l 1957.

F i m Frevention Code N.P.F,U.

National E l e c t r i d Code, N.F,P,A, Reservoir Regulation lfmual for San A n t d o Dam, 2-02. Purpose of manual, The purpose of this manual i s t o suppla the dm tender and the Dis t r ic t operating ~ r s o n n e l with instrmctions for prober inspection, oper+at%on, and maintenance of the Sari Antonio Dam, These % ~ I S % ~ L L C -t ions w i l l insure the continuous maintenance of s t ructures and equipment and t h e i r operation i n order t o obtain optimm benefits.

2-03, Definitions. Specialized terms used i n this manual a re defined ae followst nEngbeerSng Mvieionn and tlConstruetion Divisioetl r e f e r t o organization::

d t h h %he h e Angeles M s t r i e t , Corps of Engineers, U. S. Amy, RFlood seasona refers t o the pePSOd from 15 November %s 15 April, when most ps t f l o d h a v e occurred.

Ht:ajor high water periodf1 refera t o a period i n which the reservoir

0 w water surface r ises above the invert of the gated ou t l e t s at elevation 2l25.

~~Emesgency fPo& o ~ n d f t f o n ~ ~ refers to periodis during whioh the reservoir water surface r i ses above the c res t of t he spillway a t elevation

2238.

A l l elevations refer t o mean sea leve l datum.

2-04. Eference drawhsfs and manualtit.-Referenoes. in t h i s .manual Lo dmwbg f i l e numbers refer to nas-eesnatmotedn drawinge, which are half size, a e p r a t e l y bsuad, and compriw exhib2t P, DmwBngs.

Drawings 02 mm&aotaarers~ equipment and other speoiaf drawings, muals, and jlnstnxctiona referred t o in this manual a re l i r s t ~ d in exhibit G, Reference 14~~1~1s.

2-05. Functions of the Constmotion Division.--All project inspec.t;ion, operation, m d maintenance funotione a re under the jur idiot iosr of tho

Constmution Division, with the exception sf those fop hydrographic br?a-Lall%-tiswa, which are deserbbd 3a Seation 8.

The Constnratfon Division reueives a d f i l e s a l l routine inspection and operation reports and participates in engineering inspections os described in par, 2-07, 2-06. Fbnotione of the Engineerha Divia&.-Th@ Engineering Division prepares and executes a l l flood fighting plans for the project and thsgugh i ts Hydrology aand Reaemoir Regulation S e c t i ~ n direots the damtender or assigned alternates h the operation of the gates, When major repair of any progect struoture is necessary, the Engineer-ing Division makes surveys and reco~l~~endations for repair at the request of the Chief, Constmation Division, Tar. 2-06 contd, -

The Engirleesbg DLv%sion keeps reaa~ds 0% F B B B S V O ~ ~ %Sages, ~ ~ P Y O I ~ T to the sesesa~ois, releases through the outle% struotwea and spiPlway overfPow. The Engineering DivSsion a lso keeps on f i l e one copy of a l l semi-monthly t e s t reports on stand-by generator uni t and monthly reports on gate t ea ts , The Engineering Division is responsible f o r t h e inagoctim, aeyviciug and maintenance of all h y d ~ " ~ g ~ a p M ~ instalkit%ons. Theis routBrle inspec-t ion u U be dmo by the; da teade r , 2-07, Joint functions of @oarstmction and Engineering Divisions,--

Emmediately after each major htgh water p e r i d and ~lach severe earthquake, a qualified engineer from the Engineering Division and one from the

Constmotion Division shall inspect the project and shall report their findings in a joint report t o the Chiefs of the Engineeffng Constmotisa L' Dfviaions.

2-08, Duties of t h e damtender,--The damlender at San Antonio Dam is required %os

Be plreaent a t the dam when rainfa%% o r m o f f i s ocourfng, See tha t a11 equipment at the ~esekvois, including reoarding, indicating gages, gate mechanism, power units, radios, etc., is in operating condition, Perform routine t e s t operatione.

Operate the gates In accordance with % n s t m ~ t % o n s from the PEydrology md M B B W O ~ j;ie@ations Section, Follow the fixed-gate operation schedule posted 3.n t h e control house in the abeence of coamnunfcations with the Hydrology and liesemols

'J Regulations Seotion or in the absence of a repreeentatfve from that group, Pas, 2-08 COD'&

Servfoe a l l gages and recorders, (wind the clocks, install new records paper, eta. 1.

Quad the project against vandaliem, sabotage, and f i res .

Guard against unsafe oonditiom in t h e proJeet artxi.

Report on trtzwgacshg and enaroaohent of right-of-vay.

Maintain mathe seaoxds, including water surface elevations, outflow gage heighte, preafpfbtfon amounts, gate openings, and logs on prescribed

~QIT~s kinbin the beat possible relat ions with aommunitiee interested in the projeot, 2-09. &not L p s of the. Geolsaical Sumreg.--By agreeneat becrmen the Corps of Eagineers and the U. S. Geologiaab Survey, the l a t t e r wfU oomgfle the outflow ~euopds 88 obtained a t the gaging s ta t ion in the out-l e t o h m e l , and will publjbeh sene, in the U. S. GeoPogioaP Water Supply papera, 2-10. Trabfna of key ~eraonns&,--The Ehgineering Division of the

Bfatriot shall t r a i n key personnel in the operation of servioe gates, st-d-by power units, oommunioation f a c i l i t i e s , and sgeratioa and mahte~a63.ce of hydrographio instablatione. They s U beeoile familiar w%th t h i s manual, the Flood Emergenoy NaaP%al, arid the "as ~ o n ~ t r u c t e c l ~ ~ drawings.

2-XL, Prevention sf enomachent o r trespass.-Any encroachment or tmspase on the rights-of-way tha t hindere the e f f i c i en t operation and maintenanae of the grojeat sha l l not be allowed. The damtender shell poet ssNo Trespassingn signs a t conspicuous plaoes on the p ~ s d e c t m d a b l l report any unresolved disputes t o the Chief, Mainterrame Seetiow, who Ln turn w i l l re fer them t o the Real Esfate Divieion, 2-12. Permits f o r entry o r use sf rights-of-wax.--Requests fss p 8 d - F ; ~ ~ fo r .bemp~repy rBgh &o~L'ri .j~i ;,~y BS f o r US@ of Go=i~ernmen%-owned rightis-of-way sha l l be carefully considered t o determine tha t such use w i l l neither decrease the safety of the project nor h h d e r its proper functioning at any time. These requests s h a l l be referred t o the

Engineering Division through the Real Estate Division f o r appropriate action.

2-13. Routine hspect ions and maintenance,

a. Periodic routine hspectSons.-Periodic routine inspec-t ions of alructures and equipment and of the reservoir area shall be made by the dmtendler or h is ass i s tan ts t o determine maintenance measures that a r e required, These inspections shall be made around h October and

1 April and immediately following each flood. More frequent i n s p e ~ t i e n s s h a l l be made i f sequised for the safety and ef f ic ien t maintenance sf soae features s f the p ~ o j e o t . Dansing each inspec$%ml item requiring asahtemnse a b l b be cheeked and describedl on t h e inspection check l ists included a s exhibit 12. After each inspection, one s e t of the inspection lists shall be promptly submL%led t o the Chief, Maintenance Section, who w i l l route it t o Distrht employees concerned with maintenance; one s e t sha l l be submitted t o the Chief, Operations Branch, and one ae t shall be retained by the i n s p e e t s ~ , If mintenmae r e q d r e s h i r ing addbtLom% labor or equipment, %he damtender shal l subdt %0 the Chief, Operations Branch, a l f s t of pro-posed maintenance measures. This l f s t may be omitted when dangerous conditions require immediate attention. Normal maintenance sha l l be made without delay d u r h g the nonflood season. All repairs sha l l conform

Par, 2-13 Cons t o standard engineering practice and t o the de ta i l s shown on the

"as-csnstructed'~ drawings, exhibit F, be Ine~~ect isrr and e e m i c h ~ ? of maes.--In general, mutho

~ ~ p e c t i a a a a d ejemhc$sg ~ d ' the hydsographfo gages W be pe3sEamd by the danhmdler o r h i s aesistante, fi accordlance with instructions from the Hydrolorn and Reservoir Regulation Section of the Engineering

Division, This work is described i n d e t a i l under par. 8-10.

e. En~ineerina ins~eotien,--After high water and severe earthqudces, eee gar. 2-07.

d, Safety Branch ing~ectian.--All i ' i r eba id activities i n e o m e c t i ~ n with flood em~rgemeies are under the eupesvision of the Chief, Safety Branch. A t %he beginning of each flood seaeon and periodiclally thereafter, ss required, he w i l l inspect the project, see that proper equipment is a t hand, and make certain tha t the damtender and h i s a s ~ i s -tants a re adequately instructed in first-aid prooedures. Appropriate equipment includes standard f i rs t -aid k i t s and such items a s blankets, stretchers, safety bel ts , l i f e l ines , and kapok vests. Grappling i r ~ n s a re provided from the yard and gas m a k ~ are provided by %he Lss

Angebes B i ~ t r f s e off ice, (see moodl hergenay Manuaf, paragraph 6.66)

2-f4., Routine t e s t ouerationg.--The demteder o r h i s ass i s tan te ePlaPE test-operate the service gates and e leot r ica l f a c i l i t i e s i n the control house every 30 days, and the standby power uni t every 15 days, Teslt operation reports (exhibit D) a W be completed in quadruplicate a f t e r eauh tea t , One copy sha l l be pronptly eubmitted t o the Chief, Par. 2-U, Contd l*hintenance Soction, one copy shall be eubmitted to the Chief, Engineering

Division, one copy t o the Chief, Constmction Division for inclusion in the annual report, and one copy shall be retained by the dam tender.

DarLng reservoir regulation by the Engineering Division, 'the d m tender or personnel assigned frm the EngineeAng Division shall mise and lower eaoh gate in aeoordmce with radio or telephone hs%mc%bsna from the Hydrology andl Reservoir riegulation Ssction.

2-15. Reports. Hscellaneous reports are desaribed i n detai l in paragrapher 2-07, 2-11, 2-12, 2-13, 2-14 and 8-10 and ale0 i n paragrapha t i t l e d "Inspections and maintenance.*

- I llESERVO1PZ AFWl AND l13mBnU;imT

3?01. Bescription.-The d m embankment is creating a reservoir with a gross oapacity of 9,285 acre-feet and an area of I43 acres a t spillway crest , (elevation 2238), and a gross capacity of b1,880 aese-f ee t and an area of 161 acre8 a t water surface, (elevation

2,254.5). The reservoir %$ iideguats %Q coaa%sol the s e s c s s r o P r 4 e e i ~ flood t o an outffow of 8,580 c.f.s, w i th debris storage of 2,800 acre-fee t , whfah is the estiredlted SO-year debris accmulatioa. (See drawing, f i l e no. 365/36, exhibit F and exhibit A).

3-02. &,-The dam is an earth ( ro l led-f i l l ) embankment, 3820 fee t i n length, with top a t elevatisa 2,260. The m&m height of embanhen t above streambed is babO fee t , The a h b e n t crose section has a top width 0% 30 fee t with upstream and downstream slopes of 1 ver t ica l on

2 horizontal between elevations 2260 and 2220 and P ver t ica l on 2.5 horizontal below elevation 2220. The embankment cross esction consists of' sandom pervious f i l l with an Znrpervious core that is flanked on each side by a t ransi t ion zone 12 f e e t wide, Across the valley bottom an hpervfme blanket exbends upatream under the random pervious zone f s o a the core t o the upstream t ~ s , The ups%rsm $ 1 ~ ~ 8 8s protected by a layer of' ~ m r s e pervious material. The downstream slope has no formal slope protection, (See drawing, f i l e 80. 33/37, exhibit F).

3-03. Aocess roads.--An acoess road on the downstream f i c e near the east abutment leads from Mountain Avenue t o the top of the dm. An access road, s ta r t ing a t the M t . Baldy Road on the west bank, crossee the s p i l l -way forebay and terminates near the control houm a t the top of' dan, Par, 3-03 COD'^^^, Additional rmda lead from %he top of dam dma t h e upstrean face sf bhs dam, one t o the top of t he out let gate structure and enother '60 wd.%s

No. b and No. 2. The access roads a r e provided with gates and r a i l -guards a t t he i r entrances.

1 house.--The control house on top of the dam consists

0% two aashforced csner;.ete uni ts , the control room and the generator room, 8epamtd by a car port t o reduoe objectionable noiee when the generator is operating. The Q Q ~ ~ F Q ~ room 60Eb~hE3 two 16) H e P o , 220/4/(3 volt, 60 cycles, 3 phase, 3.200 RR4 e lec t r i c mo%o~s a d power a d l i g h t panels, the gate position and reservoir etage indicators and recorders, radio transmitter and receiver, htercomwuli8ation telephone, electsim,b g ~ n t r o l p 8 l . 8 and arr o i l heater3 a s t o r a ~ e and off ice room and a t o i l e t are p r t i t i o n e d o f fb .The generator room h w e s the Diesel generator atandby unfh 62.5 I.V.A. SQ K,W., 3 phaee, 60 cycles, 480 vol t , 1200 RPM, a rad is standby power uni t , two 258 gel, Fuel tanks, an elec%sioab csn t s s l panel and an exhaust fan. (see drawings, f i l e Nos. 365/68 t o 365/7% inc&usive, exhibit F, and pl.at~~, exhibit G2)

3-04. -.--The 10-foot fmpsrvlous blanket, extend-b g fron the impervious core t o the u p s t r e m t o e of the embankment, provides an adeqwtte oentrsl of undexaeapge a d drainage. With this method o f underseepage eontrol, amU quanti t ies ~f seepage w i l l s s e w along the exfireme Power portion of the d o w n s t s e ~ ~ ~ $see Bmever, the ereit gradient is low, probably not exoeedfng 0.2. A8 t h i s gradient is considerably below the critical gr~dienta of the foundation and embankment shell materials, no piping of the fines i n the foundation and embankment w i l l r esu l t , 3-06. -1lerx.-The uk i l i t y gallery consf sts of a 4-foot diameter reinforced concrete section about 459 f e e t i n length benched

Par, 44% Contd.

i n to bedrock a t the t oe of the l e f t abutment. I@ is founded on bedrock throughout. The upstream end of the gallery is closed wi th a 12-inah thick reinforced concrete bulkhead construated integral ly w i t h thu gallery. The downstream end terminateo in a &-foot -square re9nforced eono~s te box, o r aaaess chamber, ooveretd with stew2 doors, h a ah diameter oessugated metal pipe dmb from %he concrete box is provided

Lo take oare of leakage and seepage. (See drawbgs, f i l e 0 965131 and 364432, d i b i t F) , 3-W. UtUitSes ,

a. City of Upland pipelhe.-&bedded i n the bulkhead of' the u t i l i t y gallery is a &inoh diameter flanged pipe sonnectfon assembly t o which the City of Upland has somected a pipeline which car r ies the f b w from wel ls No, U a& 2 located a% the upstreea.tos of the d m to the storage reservoyz-s located a t the downstream toe near

%he east abutment. (see drawing, fils No. 3&5/3CI0 exhibit F).

"o a n o n Water Company pipeline,--An 18-inch concrete p i p e l h e serving the Canon Water Company and a combination 12-inoh s t e e l and eonurete pipeline, delivering water f o r the North Paloares Ir~lga-t i on Company from a check dam An Evey Gaaoa. Lo the Canon Water Campy g ips lho , ape provided under and alongside of the outlet works. Bort%ona% of the 8ystem BQDS%S~ of 15-heh mBnfor~ed concrete pipe kura 119-inch s t e e l p%pe, and a junction box. (See drawing, f i l e 110. 3 6 5 1 3 ~ ~ exhibit F) ,

a. San Antonio Water Company pipel%ne.-An Antonio Water

Company f a c i l i t i e s are located outside of the basin w i t h the exception a concrete pipeline through the besip, of the in f i l t r a t ion tunnel located %n the valley graveyand the diversion tunnel through the eas t abutment. (Set3 drawing, f i l e No. 365130, 9xhLbit

2-08, hupsetfsns mci maintenance.--%he damtendes QP h i s assistardbs

- a h P 1 perform periodic inspectismand mafPl%enmae m d t s h ~ l l comp%ele inspection check l ist a s show i n exhibit C. Maintenance work is described i n d e t a i l Jn the following paragraphs:

a. ~ . o - M a f n t ~ n ~ o e methods f o r repa i r o r reconstruc-t i on of the embankment s h a l l depend upon the extent of the damaged section, n t damage is small, omd and gravel QP s the r coarse granular mtesi&~P may be ueea for repair , If t he damage is lmge, the fill s h a l l be made in the same manner a s the or ig ina l construction and homogenous material from borrow p i t s approved f o r the project s h a l l be used and compa$xd t o a density equal t o the or ig ina l embankment section.

b. Concrete and r i p r ap . - -Uged concrete o r r ip rap s t ruc tures hall be repaired promptly, Broken concrete surfaaes and exposed rein-forcement ateel eha l l be tho~aughly cleaned by chipping or smdblas tbg and e b U be b u i l t up t o the o r i g h a l dheas ions ; p n e m t i a a l l y placed

Portland-cement mortar is sa t i s fac tory f o r t h i s work. Small smcks i n the conorste may be f i l l e d with asphalt. Any indication of settlement, up l i f t , o r f a i l u r e of conorete s t ructures s h a l l be reported by t he Chief, Construction Division, t o the Chief, Engineering Division, f o r analysis and f o r recommendation on remedial action.

G O Access made, and b e m c - d ~ ~ e s s I P O ~ ~ E I and emberdment b e m sh11L be adequa%caly maintxiheal f o r vehioular t m v e l 80 t h a t ordSrs_e~y maintenance of the prsJect a d flood-fightha; operations w i 1 1 be f a c i l i -tated. The c r e s t with the roadway on the darn s h a l l be well asowned and maintained t o drain readily.

Par, 3-08 Contd.

d , Rblr~owfna animals.-9usrowing animals in o r near the d m

SW be exterminated. TbePr runways and dene &hal l be opened up and thorou&ly compacted a t the same time they are backfil led, Trapping and poiasioning m y be ueed f o r the externination of burrowing animals, Informa-t i on about other methods of animal extermination may be obtained from the county agr icu l tura l agent.

cite Baza~dous obstrwtidnrs.--Resewation &Pee ueed by authsr%%ed p e ~ s o m d shall be kept free from ~ b s t r ~ c t i o t b s fAat nay cause LnJury ss impede inspections, maintenance, o r flood-fighting operatione. Materials, equipment, and auxi l ia ry construction sha l l be stored i n such a way t h a t they a r e not haaardous t o personnkl.

f. Vehicles and esuiloment,--Vehicles and equipment, including tools , ahal l be kept i n first a l a s s condition, Government-owned motor trehiclca w i l l be inapeated and maintained by the base yard i n aecsdanee with "Teeh$-eeP1 Manual 38460-1, Opsratoz;.~ Maintenance Iaastructions and Ps~cedares fss

Administrative %$or vehicle^ -- 16 April 1957."

SEC'l'iOlJ 4

OUTLET W O W

L'+-BB. General foaturoq.--The ou t l e t works, located, i n tho etrearn-bed along the right abutment of %he dam, oonaiat of an approach c b n e B , sxteendbg from statieoz 667.50 t o s tat ion 7456,O; tm intake structwe between e$Ehtions 7+=56.Q and 8+25.%2 ssmgs~d sf three psoages, eoeh

5 f e e t 8 hohee wide by PO f ee t high through which the Blow 9s controlled.

by hydraulically operated s l ide gabes of the game size; a t ransi t ion section from stat ion 7.1.82.50 t o s ta t ion 8.t68.94 connecting the gats sjtructure t o the out let aonduitj a circular out let conduit, 14 f ee t

6 frsohes i n d h e t e r , extending from stat ion 8-Mi8.94, t o station 13+77,0 mdsr the embahen%g asd an outlet channel t m e i t i s a from station 13-1-77

$0 stat ion P4912e23, discharging Plows ~ L Q o temporary QEvereion ch-.wne?

and thence in to the existing diversion structure. (See drtiwings, file

Nos. 364/35, and 365164 Rev, "At1, exhibit F).

4-02 Approach channel.-Tho approach oharmel consists of an open rectangular reinforced concrete section 88.50 f e e t long with a bass ~ i d t h of 27 feet 9 inches a d with wall heights, v a ~ y i n g from 3 f ee t 6 inehss t o

$7 fee% 9 fnckae~ of whish 3 feet 6 inches extend above the embankmeat, Hn the approach channel, Just upstream of the intake s tructure is atrash rack, consisting of hal ined 16-inch steel beams spaced t o give 4-foot d e a r openings, The trash rack is designed t o pass snall debris and avoid ~lshinglfngu or blookhg and yet t o prevent gassage of large debris that might lodge in the conduit. A c l e w opening 3 f e e t 6 inches abovc

'&he invert 9s pr~vfded t o allow pasage of small debris during low stagoo, (See drawhgs, f i l e HOB, 36d36 and 36u43, exhibit F ) .

4-63. Intake etructure,--The intake structure, &9e72 feet in length, contains the three 5 f e e t 8 hohes by 10 f e e t intakes, gab;es, gate

Par -LA , 1 ckabei , hu3 t l lJ~-~~c i t ;13ur~be~ ti nri access galler> jo ins at .tt ~downs~~~eain f r : -of the gaLe cha~bes. T h a t air vents e n t w thz s t ructure above t h c e a t t chamber and conlhue withLi t h e csncsete walls and floor of the conduits, The t ransi t ion of the three 5 f e e t 8 inches by 10 feet intakes irztl~ t h e

U, fee t 6 inches diameter cirntii-r con&dt is pas t ia l ly eccsmplishd i n ~nc,:

intake structure. (See drawing, Zi le No. 364/37, exhibit F).

4-04. Access ~allery.--The ou t l e t works access gallery consists of e reinforced rectangular concrete box, 5 f e e t wide by 10 f ee t high and 268 feeL loag plaoed on a 1 on 2.25 slope i n the embanlanent near the upstream facc, extending ft.m the gate chamber i n the intake s t ructure a t f loor e l e v a t i ~ r

2U5.58 t o elevation 2247.93 on the domatseam face of the mh&caltB LUL-necting the gate chamber with the control house on '&sp of the dm. the g a l l - L provides the sole access ko the out le t works gate chamber. The ga2izry S1-:~r

( ) consists of a 3 foot wide continuous stairway with 212 steps. An inclined w elevator has been provided along the stairway t o rel ieve the s t r a i n of cli..~-irzg the stairs. The gallery contains water, phone, power, gate position

M l e a t o s system and OU presswe l i n e s fop hjdraulie gate operation extend-ing from the Contra3. house, t o the gate ember. (see drawings, file No&, 3&5/'61 and %5/62, exhibft P; f o r elevator, see exhf'bf % G2pLste a d exhibit G-5).

4-05. Gate a i r vent@.--The three gate a i r vents supplying a i r t o the downstream side of the gates consist of extra strength 33-h1ch rein-fore& concrete pipea placed En the face of the embankment and exteading between the air intake a t top of dam and the ducts i r n the out le t works gaLe slmctwe, The intake to t h e a i r vents esns is t s of a rsctangulsr box recessad into the em"m&menL a t the top of t he dm, The a i r intake

- Par. 4-65 Contd, 0 V is covered with a s t e e l grate and provided with a safety fence. (See drawings, f i l e Nos. 365161 and 365163, exhibit F).

4-06, Conduit transition.-A transi t ion dmstmam from t h e gases conveys the flow from the three jfeet 8 Lnahes x 10 feet reatangular intakes t o a single clradar GOXNIUI% OF 14 f ee t 6 Snakes diameter. The t ransi t ion

8~ dssi@ed t o eliminate a l l relat ively sudden ahmges i n boundary shape and crose-sectfonaf area, which could be a souroe of cavitation.

The piera which separate the gates were reduced in the t ransi t ion from a width of 5 f e e t 4 inches t o a width of 13 inches in a length sf

~ i 0 4 fee t , from stat ion 7+82.50 t o etation 8146.54. Revera@ odscular curves were used in the aide walls t o redudae the ~vembS width from 29 feet

8 inches a t the gates %o the f ee t 6 inshes diameter a t the circular

( 1 conduit. A s t raight l ine roof t ransi t ion changes the height from 10 feet

V at the gate section to 14 feet 6 igohee,at the aircular conduit, Ths t ransi t ion from rectangular t o circular tmrs aocomplished by the UBQ of f i l l e t s . (see drawings, f i l e Hoe. 364135, 36u.0 and 364/41, exhibit 3')

4-07. &&let cond~it..-The naiw outlet conduit is built of beLn-forced concrete, eireuhr in orsss seotics! a d %ms a diameter of 14 fee t

6 inches, a length of 508.06 fee t , and slope of 0.~52056, The elevation of %be invePt at the beginning of the oircular oonduiie is 2120.5 fee t and the elevation of the invert a t the ex i t portal i s 2094.05 feet , The maxbnm capacity of the conduit, with gates f u l l y open, is

11,000 c. f .a. f o r water surface a t spillway orest (elevation 2238), Ths maximum internal head i n the circular conduit is appfsfimtely 5 feet, Par, 4-07 Contd, Velocity i n the conduit with a discharge of 11,000 c.f.s, f s about I-)

67 feet per second, (see drawing, f i l e No, 36u35, exhibit F), 4.-08. Tm~zpomy out le t chaylzlel. --The t omporary outlet channel eomects the cfssules out le t conduit of f e e t 6 hshes d i m e t e ~ cad the diversion headworks of the Pornona Valley Protective ~ S S O C ~ ~ ~ % Q E I un t i l the proposed downstream channel and diversion s t ructure are constructed. It is construoted of reinforced concrete and grouted cobblestones ernd f o r m a s t i l l i n g b a s h to reduce the vekocftg of ~ X Q W and provide water depth at the headworke f o r diversion t o the spreading grounds, The outlet chamel is conpaaedi of (1) a ~ o m w e t e t rxas i t ion section from s ta t ion 13-l-77 "I; stattion U+1.B2,23, o k n g h g the cross sectioa from the foe t 6 inches circular conduit t o a fl, foet 6 inches wide rectangular open channel; (2) a concrete rectangular section between

L' s ta t ion 14.F.U.23 andl 15f80 within which about 57 f e e t are curved on a centerline radius of 150 feet . This sectif on 2s II, f e e t 6 inches wide with an 8 foot high center guide mll 64 feet long; and (3) a trapeeoidal s t i l l i n g b a s h section sf grouted cobblestone from stalicm 15WO t o station

174-00, increasing Ln width from 14 feet 6 hchee t o about $0 feet, The diversion weir of the head work^ forms t h e end si l l of the s t i l l i n g 'basin and the sidewalls and headgates of the s t ructure a r e joined by the paved slopes and walla of the out le t channel t o f o m the side boundaries of the s t i l l i n g basin. (See drawing, fils No. 365/6A8 exhibit F), 4-09. Float reaorder well.--The recorder well csnsiats of a rein-

£OPC& concrete shaft , l, f e e t ;bn ins ide diameter and 142 f e e t high, which is f ~ m d e d i n bedisoak a d s i s e ~ through %he hnpemEous core t~ the $look of the control house. The well is supplied from an intake Pocatd 118 feet upstream of the out let works intake s t ructure through 460 f e e t of 12-inch tni - .C $

I - ) altlinet~r , ._zr plp t -ncasea i n - .lL'orc_ l co- ret,e, rne c e n t e r l ~ ,- V the well a m in take is 19 feet eas t of thc, cen te r l ine of the out1 770r-

The recorder w e l l is provided with a switch operated by a f l o a t wnich is s e t f o r a cerLain water elevation. It sends out warning signals by ~ 3 i o t o the Hydrology and Reservoir Regulation Section and r ings a b e l l irr the dmtelnderls house. (sea drawing, File No. 365666, exhibi t F,Plats No. A , exhibi t 6-2 ) .

4-10. Drafm~e.-Grainage is provided by 6-inch perforated, v i ~ r i l i w clay pipe drains located behind the retaining w a l l and the c h c l sectior waUs. l?le drain pipes are surrounded with dra in material. and discharge through the ualls i n t o the channel. (see drawing, f i l e NO. 365164, oxnibi t Fj, 4-U e .--The damtender o r his assistant:

shall inspect aach year, before tho…