7/23/2019 Aludes Torrenciales La Guaira Usgs-i2772-Sheet1

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400

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1100

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1 100

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1969

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526

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72

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6

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35

66

408

324

18

507

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33

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6

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726000 728000 730000 732000 734000 736000 738000 740000 742000 744000 746000 748000 750000

728000 730000 732000 734000 736000 738000 740000 742000 744000 746000 748000 750000

2 KILOMETERS1 .5 0

SCALE 1:25 000

1 MILE1 1/2 0

12 1.5

CONTOURINTERVAL20METERS

C A R I B B E A N S E A

O s o r i o

C a r i a c o

S a n J o s d

e G a l i p n

E l C o j o

C a m u r C

h i q u i t o

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S e c a

C e r r o G

r a n d e

N a i g u a t

C a m u r G r a n d e

A l c a n t a r i l l a

U r i a

CARABALLEDA

LaGuaira

Macuto

ElCojo

Naiguat

4416

S26

4121

4122

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41264125

4127

4914111

4101

41024103

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4101241010 41011

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41020410154101641021

410541064107

4104 451 452453

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71177118

4411

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482

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483484

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41114

4412

7107

ExtentofDecember1416,1999,debrisflowsandfloodinginmajorchannelsMappedfrom aerialphotographs andfield examination

Channelobservation andmeasurement siteMeasurementsfor channelsareincludedinappendixA

Landslideobservation andmeasurement siteMeasurementsfor landslidesonhillsidesareincludedinappendixB

4416

EXPLANATION

S27

MAIQUETIA

NAIGUATACARABALLEDA

SIERRA DE AVILA

ObservatorioCajagal Caracas

40 0

3 7 5

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66 50'

10 35'

Figure 2 .Mapofestimated rainfallfrom Geostationary OperationalEnvironmentalSatellites (GOES8)infraredsatellite data forthe storm ofDecember1416,1999.GOES8 rainfalldatasuppliedby the NationalOceanicand Space Administration (NOAA).Sites of ground-basedrainfallmeasurements include MaiquetaandObservatorio Cajagalin Caracas.The fewground-basedrainfallmeasurements variedgreatly with those obtainedfrom the GOES8estimatedrainfall.Rainfallcontour intervalis 25mm. Photographicbase ofFebruary 1994was furnishedbyVenezuelaMinistryof EnvironmentandNaturalResources.

Area of study (fig. 1)

Coastalmountains

LOCATIONMAP

Venezuela

Colombia

Brazil

Map Slopeangle,Width,Length, Thickness, Volume, Geologicdescription Comments n o. in degrees in m in m in m in m 3

CamurChiquito

S1 53 5 15 0.75 56.3 Foliated schist S2 48 8 100 0.5 40 Soil slip. S3 49 5 15 0.5 37.5 Foliated gneiss

San Julin S4 34 3 5 2 5 2 5 30 2 ? 1 ,2 50 De ep- re dso il Rot ati on al soi lsl ide . S5 60 5 8 0.2 20 Tan soil over schist Planar soil slide. S6 48 5 10 0.3 15 Soil of schist fragments Debris slide. S7 30 10 10 1.5 150 Weathered tan schist Debrissl ide. S8 37 30 30 0.5 450 Parallel to foliation in schist S9 3942 4 3 0.3 3.6 Blocky debris slide S10 4 4 0.5 8 Blocky schist Debris slide. S2 7 4 7 4 5 2 59 2 .0 3 .0 29 ,1 38 Mi ca schi st Re mov ed ma te ri al to ma in ch an ne l. S28 53 39 136 1.02.0 7,956 Mica schist Blocky debris slide.

Camur Grande S11 35 20 22 1.02.0 660 Deep-red soil Soil slide. S12 40 25 25 0.4 250 S13 38 4 6 1 24 Soil overweathered schist Soil slide.

S14 42 8 4 0.2 6.4 Soil slide. S15 50 5 20 0.2 20 Soil slide.

Alcantarilla S16 3842 18 21 0.550.80 255 Blockycolluvium Reactivated debris sl ide overweathered bedrock. S 17 3 0 4 0 5 0 4 8 ,0 00 B lo ck yr ed so il B lo ck so il sl id eo ve r gr ay we at he re ds ch is t. S18 Thin soil over rock Soil slide.

Seca S19 37 19 136 2 5,168 Blocky red soil Debris slide. S20 46 39 32 2 2,496 Brown soil over schist Soil slide. S21 30 98 200 3 58,500 Rotational soil slide

El Cojo S2 2 4 8 4 10 1 4 0 Re dsoi lschi st fr ag me nt s Soi lsl ip wi thi no ld la nds li de .

San Jos de Galipn S23 3537 25 20 2 1,000 Blocky schist Debris slide.

S24 4244 8 8 0.7 44.8 Blocky rock Debris slide. S25 39 3 5 0.5 7.5 Blocky rock in brown soil Debris slide.

Osorio S26 48 10 10 1 100 Blocky yellow colluvium Debris slide.

APPENDIXB.LANDSLIDE MEASUREMENTS[Mapno.refersto fieldmeasurementsitelocationsshowninfigure1.Slopeangleisestimateof originalhil lsidesteepnessprior to landsliding made bymeasuring steepness adjacent to flank and scarp of landslide. Width, length, and thickness refer to dimensions of initial landslide source area beforetransition todebris-flowtrack.Geologicdescription refersto descriptionofmaterials visibleinmain scarpandbase ofinitial landslidearea.Commentsinclude classificationofinitiallandslide movement.,indicatesno measurementsorobservations]

10.3 6.7(7.4) Bothschistandgneissboulders;largestgneissbouldercarriedinmatrix. B us b u ri e d wi t h wi n do w s in t ac t ; la m in a r de p os i ti o n ar o un d b us ; b ou l de r s supportedbycoarse,sandypebblymatrix.

N e wd e br i s- f lo w t er r ac e w it h m in i mu m t hi c kn e ss o f 2 .9 m c u t by s u bs e qu e nt f l oo d in g. D e br i s fl o w fr o m tr i bu t ar y c ha n ne l l e av i ng d e po s it s a to p d ep o si t s in m a in c h an n el .

1 4 .0 9 . 2 (1 0 .2 ) D e br i s fl o w mo v ed o v er t o p of o l d ho us e f ou n da t io n . 11.4 8.6 (9.5)

I m br i ca t ed b o ul d er s ( ma x im um d i me n si o n of 1 t o 3 m ) i n ma t ri x ; de b ri s -f l ow d e po si t o ve r f lo o d de p os i t. 2.03.0 5.8 Evidenceofasequenceofthreeevents:fromtoptobottom,coarsedebrisflow,finergraineddebrisflow, fine-graineddepositionofsedimentfromflood. 14.5 8.8(9.8) Boulderdepositedwithtopdebris-flowevent;olddebrisflowexposedatbaseofchannel withatmost1.5-m-sizebouldersoverlainwithbrownish-redsoil. 11.1 8.3(9.3) Gneissicboulder;highconcentrationoflargeboulderswith1maveragedimension. S om e l ar g e ol d b ou l de r s no t r em o ve d f ro m b ot t om o f c ha n ne l ; so me b o ul d er d e po s it i on . D eb ri s fl ow e nt er in g at j un ct io n of m aj or t ri bu ta ry . L a nd s li d e bl o ck i ng c ha n ne l m or e l ik e ly t h an s u pe r el e va t io n o f de b ri s f lo w.

8 .3 5 .2 (5 .7 ) G ne is si cb ou ld er .

S eq u en c e of t h re e o ld d e br i s- f lo w d ep o si t s wi t h co m bi n ed t h ic kn e ss o f 7 m c ap pe d b y ne w d ep o si t s. 8 . 4 6 . 3 (6 . 9) G ne i ss i c bo u ld e r su p po r te d i n ma t ri x . 9 . 3 6 . 3 (7 .0 ) G ne i ss i c bo u ld e r su p po r te d i n ma t ri x .

7 .3 6 . 1 (6 . 8) D a rk - co l or e d gn e is si c b ou l de r w it hi n a s a nd y g ra v el m a tr i x. 8.3 6.0 (6.6) C en tr al d ep os it io na lp ar to fc ha nn el . 11.6 7.9 (8.7) 11.6 6.8 (7.5) D e br i s fl o w en t er i ng m a in c h an ne l f r om t r ib u ta r y ch a nn e l of Q u eb r ad a l as C h or a s; debrisflowssplitcommunityofSanJulin. 7. 5 5 .3 (5 .9 ) G ne is si cb ou ld er . 10.5 6.8(7.6) Semi-roundedgneissicboulderdepositednearcenterofchannel. Top o f o ld d e br i s- f lo w t er r ac e 1 7. 4 m a bo v e pr e se n t- d ay c ha n ne l l e ve l ; 8 -c m- t hi c k carbon-richlayeroverolddebrisflowwith2- to3-m-sizebouldersat7.3mabove present-day channellevel. 6 .9 5 .5 (6 .1 ) G ne is si cb ou ld er . 8.3 5.6(6.2) Matrixofdebrisflowprotectedunderrock;11 ofthelargestbouldersmeasuredatthislocation.

7 .8 5 . 7 (6 . 4) G ne i ss i c bo u ld e r de p os i te d a t co ns t ri c ti o n po i nt o f c ha n ne l . M a ny b o ul d er s g re a te r t ha n 3 m d ep o si t ed o n u pp e r be n ch o f c ha n ne l . 11.7 7.0(7.8) Olddebris-flowterraceoneastsideofchannelwithsemi-roundedgneissicbouldersof2.5m depositedabout5to7 mabovelevel ofpresent-daychannel. 1 0. 3 7 .5 ( 8. 3) G ne is si c bo ul de r. I s la n ds o f b ou l de r y de b ri s -f l ow d e po s it s i nc i se d 2 t o 3 m d ee p b y su bs e qu e nt f l oo d in g.

S eq u en c e of r e ce n t de b ri s f lo w, f l oo d , de b ri s f lo w, e x po s ed i n 4 -m - th i ck s e ct i on o v er o l d debris-flowdeposits;channelerodedtoschistbedrock;middleofchannelfilledwithblockydebris. 12.3 8.2(9.1) Dark-bandedgneissicbouldersupportedinmatrix;boulderpluckedoutfromnearbyoutcrop. B ou ld er s su pp or te d in m at ri x of o ld d eb ri s fl ow . B ou ld er s su pp or te d in m at ri x of o ld d eb ri s fl ow .

I n ta c t is l an d o f ol d d eb r is - fl o w de p os i ts t o pp e d wi t h re c en t d eb r is - fl o w de p os i ts i n m id d le ofchannel;slightlyraisedbedrockbenchononesideofchannel;steep north-dipping foliationinbedrock. 8.4 5.7(6.3) Trimlinefromflood12.5mabovepresent-daylevelofchannel;muchhigherthantrimline fromdebrisflow;gneissicboulder.

M os t ly e r os i on a l sc ou r i n n ar r ow c ha n ne l ; on l y th i n la y er o f d ep o si t io n r em a in i ng o n h ig h t er r ac e .

14.7 9.7(10.7) Bouldermoved(?)allsidesofboulderappeartobefreshandunweathered;somepartsofboulder are covered by fresh deposits. 1 2 .8 8 . 4 (9 . 3) N e w2 - m- t hi c k de b ri s -f l ow d e po si t a to p o ld t e rr a ce . E v id e nc e o f de b ri s f lo ws i n m ai n a nd t r ib u ta r y ch a nn e ls . D e br i s fl o w in m a in c h an n el o n a s l op e o f

6 to7 carriedthelargestboulders;subsequentdebrisflowfromtributarychannelona 15 slope crossedandtemporarilyblockedmainchannel. L a rg e b ou l de r s i mb r ic a te d o ve r i nc l in e d, s a nd y p re - ev e nt ( ?) s u rf a ce . T h ic k bo u ld e ry d e br i s- f lo w de p os i t in c is e d ju s t be l ow j u nc t io n o f tr i bu t ar y . O l d ve r y r ou n de d g ne i ss i c bo u ld e r at e d ge o f c ha n ne l ; re c en t d ep o si t , 1 t o 3 m th i ck , plasteredagainstolddebris-flowterrace.

A t w es t er n t ri b ut a ry c h an n el , e ro s io n al z o ne w i th o n ly 1 t o 1 .5 m o f d ep o si t io n ; ol d 5 -m -t h ic k debris-flowterraceofangularto semi-roundedgneissicbouldersabout9 mabovepresent-day levelofchannel. 11.4 8.1(9.0) Steepsidechanneloffaultzone(?)nearmainchannelofRoSanJulin. E r os i on a l se c ti o n wi t h st e p- l ik e , ir r eg ul a r t op o gr a ph y o f be d ro ck i n c ha n ne l . S em i -r o un de d b ou l de r o f a ug e n gn e is s ; ey e wi t ne s s re p or t s ar e a wa s t er r ac e wi t h ma n gr o ve t r ee s ; pothole eroded into bedrock indicates previous exposure. 17.1 10.6(11.8) Largebouldermovedandjammedintoplaceinsteepscouredsectionofchannel withirregularslopedsurface.

O l d ro u nd e d bo ul d er e x po se d i n de b ri s -f l ow t e rr a ce 1 4 m a bo v e pr e se n t- d ay l e ve l o f st r ea m; multiplebedrockstepsinchannel.

M a in c h an n el c o mp l et e ly s c ou r ed e x po si n g be d ro ck ; s id e c ha n ne l s ch o ke d w it h b ou l de r s; semi-roundedbouldersareseenwithinolddebris-flowterraces. U -s h ap e d ch a nn e l in b e dr o ck w i th ou t a ny r e ma i ni n g de p os i ts .

1 2 .5 7 .0 B e dr o ck - co n tr o ll e d ch a nn e l; c h an n el c l ea n o f de b ri s e xc e pt f o r th a t le f t ab o ve t e rr a ce . D e ep l y sc o ur e d be d ro c k ch a nn e l wi t h se v er a l ol d b as e l ev e ls . 7.58.04.24.4 Weiratconfluenceoftributary;debrisflowsfrombothchannels;belowthispoint, well-sortedflooddeposits;westerntributaryhadU-shapedbedrockchannel,with 18 slopeinfoliatedschist. Well-sorted flood deposits nearquarry.

F lo od d ep os it s of s an d, g ra ve l, a nd c ob bl es i n wi de c ha nn el . F lood de po si ts in cha nn el.

A t C lu b Ta n ag u ar e na , 0 .5 m o f s li g ht l y cl a ye y , re d di s h, f i ne - gr a in e d de b ri s f lo w ov e r 2 .0 m oftanfine-grainedsediment.

O ve rb an ks an dy f lo od de po si ts . F lo od d ep os it s th ro ug ho ut u ni ve rs it y bu il di ng s.

F l oo d d ep o si t s of f i ne - gr a in e d se d im e nt a m on gs t b ui l di n gs o f S im n B o l v ar U n iv e rs i ty . 6 . 7 4 . 6 (5 . 1) D e br i s- f lo w de p os i t co v er e d by s a nd y f lo o d de p os i t. 8.3 5.4(6.0) Terminusofdebris-flowdepositnearoldhouseupstreamfromtheuniversity. Flood deposits. 9.7 6.8(7.5) Onlyali t tlesandremainingfromasingledeposit ionaleventwithoutstratif ication butwithsomeimbricationofsmallboulders.

A 0 . 75 - m- t hi ck d e br i s fl o w ov e r a 0 .2 5 -m - th i ck f l oo d d ep o si t ; to p o f de b ri s f lo w i nc i se d bysubsequentfloodflow. 5.9 4.4(4.9) Compositedebrisflow-flooddepositwithsandymatrix;differentterracelevelsshow evidenceofthreestagesofflooding. L a rg e b ou l de r s i n sa n dy m a tr i x fo u nd a t d ow ns t re a m ex t en t o f de b ri s -f l ow d e po si t . I n ci s ed c h an n el , 2 5 t o 30 m w i de a n d 3 m de e p, c u t in t o de b ri s -f l ow d e po s it s b y fl o od ; debrisflowfromtributarytemporarilyblockedmainchannel. Si nu ous na rr ow cha nn el .

T ri m l in e s sh ow t wo s e pa r at e e ve n ts ; d ep o si t s in di c at e t wo e p is o de s o f co bb l y de b ri s f lo w separatedbythinlayer offine-grainedsand. 10.0 13.6 11.011.5 1 1.6 0 0 .5 3 .5 6 .5 4 .9 (5 .5 ) 5 .0 5.4 6.1 4.1 (4.6) 7.3 5.4 (5.9) Deposits of boulders in matrix neartributary.

At road crossing. 6.9 4.6 (5.1) 8.4 5.5 (6.1) 10.5 6.3(7.0) Newboulderdepositedoverfloorti lesfromhousefoundation. 10.7 7.0 (7.8) Schistose boulder. 9.7 5.7 (6.4) 6.3 4.1(4.5) Mostlyerosionalinthissection;7-m-thickolddebris-flowdepositonwestbank oversaproliteinschist;threebedrockbenchlevelsinchannel. 3.0 3.3 8.4 6.0(6.6) A3-to4-m-thickblockageofchannelbyboulders;olddebrisflow,5to6m thick, oversaproliteexposedinchannelbank. 8.0 5.1(5.7) Steepslopealinedwithbedrockfoliation;erosionalzonewithnodeposits. 4.9 3.9(4.4) Thickdebris-flowterraceabovebedrockchannel;recentdepositsplasteredoverold debris-flowterrace. R i ff l e- a nd - po o l er o de d b ed r oc k ch a nn e l; o l d de b ri s -f l ow t e rr a ce > 1 0 m ab o ve present-day level of channel; prominent bedrock bench 1.5 mabove present-day level of channel;hillsideslopes40 to45 .

L a rg e b ou l de r i n o ld d e br i s- f lo w de p os i t, u n de r cu t a nd c o ll a ps e d in to c h an n el . A n 11 . 2- m bo u ld e r wi t hi n a 1 3 -m -t h ic k o ld d e br i s- f lo w de p os i t. 6 .1 4 .8 ( 5. 3) L oc at io n of o ld w ei r. Just below channel bedrockconstriction. 8.0 4.9(5.5) Debris-flowdepositofbouldersinpebblysandymatrixoverfinergraineddeposits .

1 0 .1 7 .4 ( 8 .2 ) B ou l de r s wi t hi n p eb b ly s a nd y m at r ix ; e vi d en c e of l o g ja m > 2 m hi g h. A 2 - m- hi g h ol d d eb r is - fl o w de p os i t ex p os e d in c h an ne l ; ~3 0 -y r -o l d su r vi v in g mangotreewithrootswrappedaroundbouldersof olddebrisflow.

B a se o f o ld t r ee t r un k a bo u t 1 m ab o ve b o tt o m of i n ci s ed c h an n el . 10.2 7.1(7.9) Atjunctionofchannelsevidenceoftreehitbydebrisflowsfrombothdirections; evidenceofdebris-flowlevee.

11.0 7.8 (8.7) L ar ge , ol d de br is -f lo w bo ul de r on t ri bu ta ry . T wo d eb ri s- fl ow e ve nt s in m ai n ch an ne l. Two d e br i s- f lo w e ve n ts i n b ed r oc k ch a nn e l of t r ib ut a ry . 6.9 5.2 (5.7) F i ve t e rr a ce s ; up p er m os t t er r ac e i s a de b ri s -f l ow d e po s it .

1 3 .2 9 . 3 (1 0 .3 ) S e t of l a rg e b ou l de r s re f er r ed t o a s "F o ur S i st e rs . " 10.9 6.8(7.5) Gneiss-l inedbedrockchannel,steeplydippingfoliationonchannelsides, about50mupstreamfrom"FourSisters." 4 . 5 5 .0 5 . 2 A t w at e r in t ak e , ra d iu s o f cu r va t ur e = 3 1. 4 m . 2 .5 3 .2 7. 8 6 .0 ( 6. 7) R ad iu s of c ur va tu re = 2 4 m. 2. 5 3 .9 R ad iu so fc ur va tu re = 32 .6 m. R e ce n t de b ri s -f l ow d e po si t w it h 2 - to 3 - m- s iz e b ou l de r s in s a nd y , pe b bl y m at r ix ; boulderontopofolddebris-flowterrace. P a rt i al b l oc ka g e of c ha n ne l b y bo u ld e rs i n f la t a r ea ; b ou l de r s wi t hi n s an d y gravelmatrix;gneissicbedrockonsidesofchannel.

F ro m ma in h ig hw ay , 10 0 m up st re am i n ch an ne l. O v er f lo w ch a nn e l to t h e we s t of m a in c ha n ne l ; de b ri s -f l ow d e po s it o v er f i ne - gr a in e d

fluvialdeposit. 6 .5 5 .1 (5 .6 ) B ou ld er i ns tr ee t. 7 .8 5 . 8 (6 . 4) B o ul d er s a to p w at e r tr e at me n t pl a nt . U ps tr ea m in a re a of w id en ed c ha nn el . 8.0 5.6 (6.2) Recently deposited boulders in sandy matrix; tree barkremoved to height of 2.3 m. 4.0 4.4 B e dr o ck b e nc h, 6 . 8 m a bo v e pr e se n t- d ay l e v el o f c ha n ne l w it h o ld b o ul d er s o n to p . 7.1 4.6 (5.1) 7 .8 6 . 3 (7 .0 ) L a rg e b ou l de r w it h in s a nd y m at r ix . B o ul d er s i n o ld d e br i s- f lo w de p os i t; U - sh a pe d s id e c ha n ne l . B ox -s ha pe d ch an ne l in b ed ro ck w it h st ee p (6 0 )foliation;olddebris-flowterrace exposedinside channel;largeamountofolddebris-flowmaterialremovedfromchannel.

Ver y n a rr o w, b o x- s ha p ed c ha n ne l w it h s te e p fo l ia t io n; b e dr o ck b e nc h, 0 . 5 t o 1. 0 m a bo v e present-daylevelofchannel. W at er f lo wi ng i n th is c ha nn el w as s li gh tl y tu rb id .

E s ti ma t ed a v er a ge h e ig h t of f l ow b e tw e en b u il d in g s at m a in h i gh wa y . B o ul d er y d e po s it i on i n m ai n c ha n ne l w it h p ar t ia l ly i n un d at e d ho u se s . D am ag et oh ou se sa lo ng ch an ne l. B e dr o ck - co n tr o ll e d ch a nn e l ne a r Sp a ni s h fo r t at a p ex o f f an . 9.0 5.8 7.8 5.5 (6.1) O l d bo u ld e r ca u gh t i n ch a nn e l; c h an n el b a nk e x po s es 2 0 -m -h i gh d e br i s- f lo w terracewithlargeboulders. 7 .1 ( 7. 9 ) G n ei s si c b ou l de r l e ft s t an d in g o n en d . O ld b ou ld er m ov ed s li gh tl y as i nd ic at ed b y 30 tiltinhousefoundation builtuponboulder. 6 . 0 4 .1 O ld b ou ld er s pl it i nt o tw o pa rt s by r ec en t ev en t. 7.08.5 5.5 10.7 7.8(8.6) Boulderdepositedwithinmatrix. D e br i s fl o ws c a me f r om u p pe r p ar t o f dr a in a ge a b ov e w at e rf a ll .

6 .3 4 .4 ( 4. 9) A t ea st er n en d of h ig hw ay b ri dg e. S em i- ro un de dg ne is si c bo ul de r. S em i- an gu la r gn ei ss ic bo ul de r. 9 . 0 6 . 2 (6 . 9) S e mi - an g ul a r g ne i ss i c bo u ld e r. 9 .0 5 .9 ( 6. 6) S em i- an gu la r bo ul de r. B ou ld er s ov er fl ow ed ch an ne la tb en d.

1 0 .0 6 . 8 (7 .6 ) T h in n in g d ep o si t s as d e br i s fl o w sp r ea d s at b e nd i n c ha n ne l . 7. 5 5 .9 ( 6. 6) S em i- an gu la r bo ul de r. 8 .6 5 .9 (6 .5 ) T ab ul ar bo ul de r. 9 . 6 6 . 0 (6 . 6) D e br i s fl o w co m pl e te l y bu r ie d f ir s t fl o or s o f ho u se s . F i ne - gr a in e d de p os i ts o n t op o f m at r ix - su p po r te d d eb r is f l ow. 1 2 .1 6 . 9 (7 .6 ) A t i nt e rs e ct i on w i th m a in h i gh wa y . Tabularboulder. 9.3 6.1(6.8) Bouldersdepositedonhigh-risepatio;largeboulderswithinmatrixdepositedaboveroad. O ld de br is -f lo wt er ra ce up to 5 m th ic k. O l d de b ri s -f l ow t e rr a ce , 1 7 m h ig h , di s pl a ys a s e qu e nc e o f at l e a st f o ur e v en t s; yellowish-brown,sandymatrix. O ld de br is-f low te rr ace . S eq ue nc e of t hr ee e ve nt s wi th a c ap pi ng d eb ri s fl ow . Sandy gravel deposits. F i ne - gr a in e d sa n dy d e po s it s wi t h li t tl e s tr u ct u ra l d am ag e . Semi-angularboulder. 8.4 6.1(6.8) Blockageoflargebouldersandtreetrucksprotectedhousedownstream. Debris blockage. S a nd y d ep o si t s on a s i de s t re e t pe r pe n di c ul a r t o fl o w di r ec ti o n. 5 .8 4 .0 ( 4. 4) G ra ve ll y sa nd d ep os it s. O l d de b ri s -f l ow b o ul d er s i nc o rp o ra t ed w i th i n wa l l an d p ar t ia l ly b u ri e d in l a wn . O l d de b ri s -f l ow t e rr a ce > 5 m t hi ck w i th s ch i st o se a n d gn e is si c b ou l de r s. L i tt l e da m ag e t o tr e es a l on g r oa d ; im p ac t ma r ks n o h ig h er t h an 0 . 5 m. 5.9 4.1(4.5) Afewlargeboulderswithincoarse-grainedsandydeposits;f lowthroughirregular topography in yards between houses. 10.5 6.3(7.0) Flowdepositsofverycoarsegrainedsanddistributedalongstreet . L a rg e b ou l de r s fi l li n g ho us e a nd y a rd c a us i ng c o ll a ps e o f wa l l. Large boulders supported by sandy matrix.

S ma l l bo u ld e rs , 2 0 to 3 0 c m in s i ze , i n gr a ve l ly , s an d y ma t ri x t ha t h as s o me l a mi n at i on s . A t P la z a de P i ed r as , o ld d e br i s- f lo w b ou l de r s di s tr i bu t ed a r ou n d ho u se b u il t i n 19 1 7. O l d sc hi s to s e, d e br i s- f lo w b ou l de r s ex p os e d in 1 5 -m - hi g h ro a dc ut i n r e d so i ls . C ub ed -s ha pe dg ne is si cb ou ld er . S i de c h an ne l w it h 3 .5 - m- hi g h ex p os ur e o f th r ee o l d de b ri s -f l ow e v en t s, w i th m o st l y schistosebouldersbutraregneissicboulders.

S i de c h an ne l w it h 3 -m -h i gh i n ci s ed b o x- s ha p ed c ha n ne l e xp o si n g th r ee o l d de b ri s -f l ow events;lowestdeposithascementedmatrixandgneissicboulders. 7.3 5.2(5.8) AlongRoSanJulinnearvillageofSanJulin,a15-m-highexposurewiththreeunits: debrisflow,fluvial,anddebrisflowtoppedby redsoil;lowestunithas tan-colored 2-m-sizeboulders. 10.7 6.9(7.7) AlongAvenidaPrincipal,oneblockfromoldshoreline;coarse-grained,sandymatrixatop gneissicboulders.

1 0 .0 5 . 8 (6 . 4) A l on g Ave n id a P ri n ci p al , 1 / 2 bl o ck f r om o l d sh o re l in e . No boulders found at old shoreline. 7.3 5.5 (6.1) Gneissic boulders reached road at old shoreline. 4 . 9 3 . 6 (4 . 1) F l ow b e tw e en b u il d in g s us i ng r o ad a s t he c h an n el . E y ew it n es s r ep o rt e d th a t la r ge b o ul d er s h ad b e en r e mo v ed s u bs e qu e nt t o t he e v e nt .

4 . 1 3 . 0 (3 . 3) R e si d en t r ep o rt e d am o un t o f ma t er i al r e mo v ed w a s 3. 4 m t hi ck . 5 .5 4 .0 ( 4. 4) F lo w tr av el ed b et we en h ou se s. 7. 6 4 .9 ( 5. 5) V er y ir re gu la r be nc he d sl op e. 7. 3 4 .9 ( 5. 4) G ne is si c bo ul de r. 6.7 4.4(4.8) Olddebris-flowdepositbeneathfoundationofcrushedhouse.

8.7 5.9(6.5) Boulderydepositf il l ingfirstf loorofbuilding;1-m-sizebouldersdepositedatoproof. B o ul d er f r om o l d de b ri s -f l ow e v en t ; st r ee t e ro d ed a n d se r ve d a s ch a nn e l. 8 . 0 5 . 6 (6 . 3) A b ou t 1 m o f er o si o n be n ea t h ro a d le v el . S ch i st os e b ou l de r o f ol d d eb r is - fl o w de p os i t in c or p or a te d w it h in f o un d at i on o f h ou s e. 10.6 6.7(7.4) Withinalargedepositofboulders,oneboulderwithinmatrixrestsonsteelrebarfrom buildingfoundation. O l d 1- m -s i ze b o ul d er i n m at r ix o f r ed s o il b e ne a th r e ce n t de b ri s -f l ow d e po s it s ; localirregular steppedtopography. 9.2 6.5 (7.2) 9.6 7.0(7.8) Gneissicboulderislargestwithindeposit,butschistosebouldersalsopresent. 12.6 7.3(8.1) Siteofpartial lycollapsedapartmenthouseonupper partoffan;schistoseboulder collapsedintochannel,erodedby late-stageflooding;3.5-m-sizebouldersdeposited

onsecondfloorofstructure. 9.2 6.0 (6.7) 12.7 8.7(9.6) Gneissicboulderorientedwithlongaxisparallel toflowdirection. N e wl y c on st r uc t ed c ha n ne l w it h c ro s s- s ec t io na l a r ea o f 2 38 m 2. Fluvial deposition. N e wl y c on st r uc t ed c ha n ne l w it h c ro s s- s ec t io na l a r ea o f 2 61 m 2. F lu vi al de posi ti on (?) . F in e- gr ai ne d de po si ti on o f fl uv ia l or ig in (? ). Small boulders deposited on roof of one-story building. 6 .7 5 .0 ( 5. 5) G ne is si c bo ul de r. 6.9 4.8 (5.3) 7 .6 5 . 5 (6 . 1) G n ei s si c b ou l de r ; bo u ld e r ga r de n i n fr o nt y a rd o f h ou se . F l oo d d ep os i ti o n wi t h a fe w sm a ll b o ul d er s ; ey e wi t ne s s re p or t ed f l ow o f m os t ly m u dd y waterwithafewboulders. 8 .3 5 .2 ( 5. 7) G ne is si c bo ul de r.

S e qu e nc e o f th r ee o l d de b ri s -f l ow d ep o si t s wi t h co mb i ne d t hi c kn e ss o f 7 m c ap p ed b y n ew d e po s it s. 5.7 4.0(4.4) Roundboulderpunchedthroughtwowallsofhouse;housestoppedmostofdebrisflow. 5.9 3.9 (4.4) 6 . 3 3 . 9 (4 . 4) E x te n si o n of s t re e t us e d as c ha n ne l b y fl o w. 7.6 5.5(6.1) Verythin,coarse-grained,sandymatrixwithbouldertobouldercontact. 7.3 5.4 (5.9) 8.0 5.8 (6.4)

8.0 5.5(6.1) Thicknessofdepositsdecreasedasflowmovedbetweenhouses;some bouldershavelikelybeensubsequentlyremovedfromstreets. F in e- gr ai ne d de po si ti on a lo ng s tr ee t.

5.7 4.2 (4.6) 8 .9 6 .2 (6 .9 ) Ro un db ou ld er . 7 .3 4 .7 ( 5. 3) B ou ld er s su pp or te d by m at ri x. M in i ma l a mo u nt o f f lo w ov e r br i dg e , bu t a pp a re n tl y f lo w fi l le d c ha n ne l . 4.9 3.4(3.8) 0.7-m-thick,fine-grainedfluvial(?)depositover1.7-m-thickbouldery, debris-flowdeposit. U ni fo rm c oa rs e- gr ai ne d, s an dy d ep os it . A ll d ep os it s ha ve b ee n re mo ve d su bs eq ue nt t o ev en t. D e po s it s d ec r ea s in g i n th i ck ne s s al o ng l e ng t h of s i de s t re e t. O nl y fi ne -g ra in ed de po si ts . O nl y fi ne -g ra in ed de po si ts . 5.8 4.0 (4.4) O nl y fi ne -g ra in ed de po si ts . O nl y fi ne -g ra in ed ,s an dy de po si ts . Sandy deposits. Mo st ly fi ne -g ra in ed de po si ts . D r il l in g s ho we d 4 .5 - m- t hi c k ol d d eb r is - fl o w de p os i ts w i th b o ul d er s ; on l y fine-graineddepositioninrecentdepositsatthislocation. 5.9 3.9(4.3) Boulderstraveleddownstreetwhichactedlikeachannel;depositsof imbricatedboulders. 4.7 3.4 (3.7) 4.7 3.8 (4.2) 4.7 3.6 (4.0)

CamurChiquito441 3.84.0 6.0 4.5 95.3 442 2.53.0 5.1 4.1 2 41.8 3.47 (4.31)443 2.5 0.40.5

4 4 4 2. 9 4 4 5 446 3.0 7.8 7.6 5 .0 296.4 6.67 (8.27)446 11.3 5.0 3.5 197.8 5.83 (7.23)447 4.55.0 3.04.0 1.03.0 448 8.0 5.5 78.0

449 4.5 4.5 12.0 8.2 2.4 236.2 6.18 (7.67)

4410 7.5 1.0 10. 0 4.7 3.5 164.5 5.48 (6.80)4411 4.05.0 7.0 12.0 54.0 4412 6.0 6.0 9 .0 27.4 4 4 1 3 1 3. 0 14 .0 1 6. 0 1 0. 0 17. 4 4414 5.06.0 9.0 8.0 26.0 1.0

SanJulin (channel)7101 5.0 3.5 3.5 172.0 3.1 2.6 1.0 8.1 2.01 (2.49)7101 3.6 3.0 1.2 13.0 7102 3.03.5 1.7 181.0 2.5 7102 3.03.5 7103 3.55.0 3.0 111.0 5.3 2.7 1.9 27.2 3.00 (.73)7103 5. 9 3.3 1.5 29.2 3.08 (3.82)451 2.5 0.75 7104 4.05.0 3.06.0 135.0 6.3 2.0 1.9 23.9 2.88 (3.58)7104 4. 4 2.6 1.8 20.6 2.74 (3.40)452 3.0 1.02.0 453 3.0 2.5 1.0 4 5 4 2. 53 .5 1. 5 75 .0 2. 0 4 5 5 2 . 0 3 .0 456 3.04.0 1.0 5.6 5.2 3.9 113.6 4.84 (6.00)456 5.5 5.2 1.6 45.76 3.58 (4.43)4 5 7 1 4 .0 1. 2 0 3 . 0 4 .0

7 10 5 5 . 5 > 10 . 0 1 2 9. 0 1 4 5. 0 3 . 0 2 . 1 1 . 5 9 . 5 2. 11 ( 2 .6 2 )7105 4.4 4.2 2.5 46.2 3.59 (4.45)7 10 6 1 45 .0

7107 6.0 11.0 9.0 140.0 4.8 1.8 1.4 12.1 2.30 (2.85)458 5.0 2.6 1.0 13.0 2.35 (2.92)7108 5.56.0 10.6 10.6 75.0 3.6 2.3 1.9 15.7 2.51 (3.11)7109 4.0 71.0 3.5 71010 6.06.5 5.0 98.0 6.0 5.3 1.8 57.2 3.85 (4.78)

71011 5.5 6.0 131.0 6.9 4.1 2.9 82.0 4.35 (5.39)459 3.5 1.02.0 7 10 12 5 . 0 6 .0 4 . 0 11 3 .0 1 . 5 4510 4 .0 5.0 12.0 4.0 71.0 2.03.0

71013 5.0 5.0 4.0 90.094.0 9.5 5.9 2.6 145.7 5.26 (6.53)71013 5.0 71013 5.0 4511

71014 4.04.5 12.5 4.0 96.0 3.4 2.7 1.6 14.7 2.45 (3.04)

7 1 0 15 4 .5 0. 5 5 5. 0

4512 2.03.0 3.0 3.0 95.0 10.4 8.4 4.8 419.3 7.48 (9.29)71016 3.54.5 12.0 >2.0 66.0 8.4 6.4 3.2 172.0 5.56 (6.90)4513 6.07.0 6.0

4514 15.0 1.5 2.0 4515 6.07.0 5.0 2.5 71017 7.0 1.03.0 40.0

7111 6.06.5 8.7 1.01.5 49.0

7112 16. 0 7.0 5.0 4.0 140.0 5.19 (6.44)7 11 3 4 .5 7. 0 1 0. 9 1 .0 43 .0 7114 12.5 31.0

7115 5.07.0 7.3 3 1.0 18.4 11.5 3.5 740.6 9.05 (11.23)

7116 10.0 34.0

7117 8.5 12.7 40.0

7118 10.014. 0 12.0 1 8.0

CerroGrande461 5.06.0 8.0 22.1 462 6.0 17.0 37.5 463 3.04.0 15.0 13. 7 0.1

4 6 4 0 . 2 0 .4 4 6 5 4 6 6 4 6 7 2. 5

CamurGrande481 0.51.0 1.5 482 1.0 0.20.4 483 2.0 0.91.0 484 3.0 1.01.2 2.7 1.7 0.9 4.1 1.60 (1.99)485 4.5 2.0 1.5 2.7 2.6 1.5 10.5 2.19 (2.72)486 2.5 3.1 75.0 0.7 487 2.02.5 1.0 4.1 3.6 3.1 45.8 3.58 (4.44)

4 8 8 2 . 0 1 .0

489 4.0 2.8 1.3 0.8 2.9 1.43 (1.77)

4810 2.5 3.0 4811

4 8 1 2 4. 0 6. 0 1. 0

Alcantarilla491 4.0 3.2 0.4

492 4.0 4.0 493 6.0 1.0 8.0 4.5 494 2.7 1.6 1.4 6.0 1.82 (2.26)495 4.54.8 33.5 1.7 1.4 0.8 2.0 1.26 (1.57)496 2.7 2.0 1.9 10.3 2.17 (2.70)

Seca497 4.0 1.0 498 4.04.5 2.0 2.4 1.8 0.9 4.1 1.60 (1.99)498 4.04.5 3.6 2.7 1.3 12.6 2.33 (2.89)499 5.0 19.4 5.1 4.2 1.3 27.8 3.03 (3.76)499 6.3 4.4 2.0 55.4 3.81 (4.70)499 5.5 3.6 0.8 15.8 2.51 (3.12)4910 4.5 6.0 2.0 4 9 11 8 .0 2 .0 3 .0 2 .0 2 .0 3 .0 7131 9.011.0 5.2 3.5 10.0 2.0 1.5 0.6 1.8 1.22 (1.51)

7132 9.0 10.5 4.0 26.4 3.5 7.5 2.7 1.0 20.3 2.73 (3.38)

7133 16.0 6.0 18.0 3.2 2.4 1.0 7.68 1.97 (2.45)7134 10.012.0 8.7 21.0 1.8 0.9 0.9 1.46 1.13(1.41)

7135 12.0 8.012.0 12.0 3.0

ElCojo4101 1.02.04 1 0 2 5 .5 6 .0 2 .7 2. 0 4103 5.06.2 3.2 2.8 38.0 0.50.6 3.0 1.4 1.2 5.0 1.71 (2.13)4104 2.1 2.8 4105 4.55.5 3.6 2.5 2.4 1.0 6.0 1.82 (2.25)4106 6.5 3.5 2.3 6.8 3.9 2.9 76.9 4.25 (5.28)4107 2.0

4108 8.0 2.8 4.5 4109 8.0 6.6 4.0 2.3 60.7 3.93 (4.88)

4109 7.8 4.7 3.0 110.0 4.79 (5.94)41010 10.010.5 4.4 17.5 41011 5.07.0 3.0 0.1 2.0 41012 15.0 5.0 9.0 2.0 41013 4 .05.5 3.0 3.0 1.8 1.5 8.1 2.01 (2.49)41014 6.0 6.0 2.5 41015 9.5 6.8 5.1 329.5 6.91 (8.57)41016 20.0 6.0 4.6 1.6 44.2 3.53 (4.39)

41017 2.03.0 31.4 41018 6.0 4 .55.0 24.0 7.7 2.3 1.2 21.3 2.77 (3.44)41019 6.0 36.2 41020 7.08.0 2.03.0

4 10 21 7 .5 2 . 0 3 .0

SanJosdeGalipn 4111 5.0 4.0 4112 1.01.5 2.1

4113 2.5 3.3 1.6 1.4 7.4 1.90 (2.41)4114 2.02.5 0.51.0 3.2 2.3 2.3 16.9 2.57 (3.19)4115 4.0 2.0 4116 4.05.0 2.3 3.6 2.4 1.5 13.0 2.35 (2.91)4117 6 .0 5.1 3 .4 28.0 4118 4119 7.0 2.5 1.9 0.8 3.8 1.56 (1.94)41110 5.5 5.3 2.3 2.3 28.0 3.04 (3.77)41111 1.01.5 41112 4.0 41113 7.6 3.5

41114 3.04.0 8.010.0 10.0

Osorio4 4 1 5 3 .0 5 .0 4 4 1 6 4121 20.0 4122 3.04.0 4.0 4123 5.05.5 6.3 21.5 3.2 2.3 1.6 11.8 2.28 (2.82)4123

4124 5.7 4.8 2.2 60.2 3.92 (4.86)4124

4125 3.0 5.6 16.5 4126 5.0 7.2 23.8 7.1 4.4 3.5 109.3 4.78 (5.93)4127

SanJulin (Caraballedafan)761 3.03.5 2.0 2.0 1.5 1.0 3.0 1.44 (1.79)762 4.0 3.5 96.0 2.9 2.3 2.2 14.7 762 4.3 2.5 2.1 22.6 762 4.0 3.1 2.1 26.0 2.96 (3.68)763 4.0 2.3 168.0 1.3 764 3.0 1.0 128.0 765 2 .03.0 2.0 213.0 3.9 3.1 1.6 19.3 2.68 (3.33)766 4.0 1.7 79.0 4.0 2.4 2.2 21.1 766 4.1 3.8 3.0 46.7 3.60 (4.47)767 3.0 3.06.0 434.0 5.3 2.1 1.7 18.9 2.66 (3.31)768 3.54.0 >4.0 5.9 2.8 1.1 18.2 2.63 (3.26)769 4.5 4.0 4.1 3.5 1.4 20.1 2.72 (3.37)7 6 1 0 4 .5 5 .0 7611 3.03.5 2 .02.5 6.5 5.7 1.3 48.2 3.64 (4.51)7611 5.0 2.3 1.6 18.4 7612 3.5 2.53.0 3.0 4.4 3.3 1.6 23.2 2.85 (3.54)7 6 1 3 7614 4.56.0 3 .0 2.0 5.2

7 6 1 5 771 2.53.0 1.82.5 1. 0 772 3.03.5 2.02.5 267.0 1.0 773 2.5 1.01.5 774 3.5 1.82.0 3.1 2.6 1.4 11.3 774 3.9 2.7 2.2 23.2 2.85 (3.54)775 4 .0 2.53.0 238.0 2.0 776 3 .0 0.5 239.0 2.5 141.0 2.5 2.0 1.7 8.5 2.04 (2.53)

781 3.04.0 2.5 50.0 4.8 4.4 2.4 50.7 3.70 (4.59)

7 8 1 4. 8 2 .8 1 .4 1 8 .8 782 3.5 1.7 4.5 3.8 1.0 17.1 2.58 (3.20)783 1.0 1.1 784 1.5 2.2 2.5 1.5 0.8 3.0 784 3.8 2.0 1.6 12.2 2.30 (2.85)785 3.5 2.3 13.0 1.3 0.9 0.8 0.9 0.98 (1.21)7 8 6 0 .6 787 3.0 1.82.0 3.4 0.9 0.6 0.5 0.3 0.65 (0.80)788 3.0 1.41.7 1.6 1.1 0.9 1.6 1.17 (1.45)789 1.4 2.3 2.2 1.2 6.1 1.82 (2.26)7810 2.53.5 1.5 3.1 2.0 0.9 5.6 1.77 (2.20)7811 3.5 4.2 2.1 1.7 0.8 2.9 1.42 (1.76)7 8 1 2 2 . 7 7813 3.54.5 >3.0 1.0 3.8 2.9 1.7 18.7 2.66 (3.30)7813 7814 4.0 2.5 2.0 0.75 3.1 2.4 1.9 14.1 2.42 (3.00)7815 7816 5.0 2.03.0 5.6 4.3 1.7 40.9 3.45 (4.28)

7817 2.5 2.0 3.5

7818 3.54.0 1.5 1.0 4.3 3.2 2.5 34.4 3.25 (4.04)7819 4.0 2.0 0.30.4 6.1 3.5 2.6 55.5 3.81 (4.73)7820 2.53.0 2.0 7.2 6.1 1.6 70.3 4.13 (5.12)

7821 4.0 1.0 1.0 1.0 7822 4.0 1.52.5 183.0 3.5 3.2 1.9 21.3 2.77 (3.44)7823 4.0 2.0 8.2 6.2 4.1 208.4 5.93 (7.36)7824 4.0 64.0 7825 4.0 0.4 0.1 1.0 7826 72.0 7827 2.3 1.6 0.2 7828 4.5 1.9 0.4 7829 2.53.0 2.0 1.4 7 8 3 0 3 . 5 6 .0 3 . 0 1. 2 1 .5 7831 4 .5 0.81.5 2.3 1.7 1.6 6.3 1.84 (2.29)7832 4.5 1.8 1.8 2.1 2.8 1.8 1.0 5.0 1.71 (2.13)7833 4.5 2.0 1.0 7 8 3 4 3 . 0 4 .0 1 . 8 1. 0 7835 3.54.0 3.0 3.2 2.2 1.7 12.0 2.29 (2.84)7836 4.55.0 2.3 1.8 1.31.5 7 8 37 1. 7 1. 8 1. 3 1. 0 7838 5.07.5 0.6

7101 5.0 3.5 3.5 172.0 3.1 2.6 1.0 8.1 2.01 (2.49)7101 3.6 3.0 1.2 13.0 7102 3.03.5 1.7 181.0 2.5 7102 3.03.5 7121 3.0 2.0 1.5 1.5 1.2 0.9 1.6 1.17 (1.46)7122 3.03.5 1.5 1.8 1.3 0.6 1.4 1.12 (1.40)7123 2.5 2.5 36.0 2.0 1.5 0.5 1.5 1.14 (1.41)7124 3.0 1.9 1.9 1.52.0 3.0 2.2 1.9 12.5 2.32 (2.88)7124 2.7 2.0 1.9 10.3 2.17 (2.70)7125 4.04.5 64.0 4.6 2.4 1.5 16.6 2.55 (3.16)

7126 6.0 1.8 3.1 2.4 1.7 12.6 2.33 (2.89)

7127 3.54.0 1.8 0.6

7128 3.0 1.5 2.0 1.2 0.9 2.2 1.29 (1.60)7129 2.53.5 1.4 3.2 3.0 2.8 26.9 3.00 (3.72)71210 3.5 2.0 1.52.0 2.0 2.0 1.2 4.8 1.69 (2.10)71211 2.5 2.5 1.7 20.0 71212 2.53.0 37.0 71213 3.0 1.7 1.21.4 1.0 0.9 0.7 0.6 0.84 (1.04)

71214 2.5 1.6 71215 2.5 1.8 1.2 71216 0.70.9 71217 1.01.5 1.6 0.91.4 71218 1.0 1.0 1.0 71219 1.52.0 71220 3.03.5 1.1 0.5 0.5 71221 3.0 0.51.0 0.51.0 71222 0.8 0.6 1.6 1.3 0.8 1.6 1.17(1.45)71223 4.5 0.20.3 0.20.3 71224 3.05.0 0.5 71225 3.03.5 1.21.5 0.81.5 71.0 71226 3.5 1.0 0.40.5 71227 2.5 0.8 0.2 71228 2.0 0.81.1

71229 4.55.0 1.1 1.0 1.3 1.3 0.8 1.4 1.11(1.37)

71229 0.9 0.8 0.8 0.5 0.82 (1.01)71230 4.0 1.2 0.8