Covol dei Siorispring

re3

re5

re4

gp1

gp2

gp3gp4

gp5

gp7

gp8

gp8“il laminatoio”

la1la3

la4

gp6

re10

re11re12

re14re14

Re15

re15bis

re16

re20

re21

re22re24

re25

gp10

gp11

gp12

gp13

gp14

-51

+16

Entrance

-17

-18

-18

-15-19

re14

Gp5

A

A’

Upper dry tunnel(re10-re28)

Entrance tunnel with lake(re1-re10)

Underwater passages(gp1-gp14)

re1

Plan view

0 500 1000

m.

?

A A’

diver to scale

MagneticNorth True

North

Magnetic d

eclin

ation

2° 15’

Magnetic declinationin 1959: 2° 15’ W

decreases annually 7’

0°

90°

180°

270°

Rose diagramand main directions of tunnels

1

2

20 m

The Oliero springs at the foot of a huge limestone cliff along Brenta Valley: “i Veci” (onthe left) and ”i Siori” (on the right), during a strong flood in february 2009.

0 5 10 15 20 25

m.

0 10 20 30 40 50

m.

Italian Speleological Sociaty

Arianna Caving Club (Treviso)

Position: Valstagna, VicenzaEntrance elevation: 175 m (asl)Date survey: 2004

Latitude: 45° 50 40,8” N Longitude: 11° 40 05,2” EWGS 84 UTM32T

Survey and photos: Alessio Fileccia (Visual Topo)

survey team: Bonifatto Andrea, Bottacini Eugenio, Cuccato Diego, DalMolin Marco, De Angelis Andrea, Del Longo Arianna,Favaro Andrea,Forte Vally, Genova Dario, La Prova Gianfranco, Malatesta Edoardo,Maran Gabriele, Piovesan Tiziano, Sebellin Marco, Vicenzi Luca

Base map: IGM: 37 IV SE, Valstagna 1:25000Lithology: limestone and dolomitic limestonePrecision survey: from entrance (re1) to gp9 (laminatoio): grade 5/C

from gp9 to gp14: grade 3/B

Point of view for underwater pictures (see elevation view)

Scale (plan)

Scale (sections)

Covol dei Siori spring

Plan

1

Upper dry tunnels

(Visual Topo)

Covol dei Siori (Valstagna, VI)surveyed tunnels 650 mout of 3000 m explored

Entrance

Lower underwater tunnels

+16

-17

-51

Veneto region, NE Italy