FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ
The Devon Karst Research Society & Speleološko Društvo "Zelena Brda"
Istočna Hercegovina, Bosna i Hercegovina.
Источна Херцеговина, Босна и Херцеговина,
FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ
Fatnica Polje, Eastern Herzegovina, Bosnia & Herzegovina.
updated 04 October 2005. Section 5.0.    THE PERIODIC LAKE  -  PERIODIČNO JEZERO  -  ПЕРИОДИЧНО ЈЕЗЕРО :
FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ

Polje Flood-level Hydrometrics 

Flooding in this polje can last from between 79 to 213 days and the highest water level can be as much as 38 - 40m. above the lowest point on the polje floor.
According to the records of the Yugoslav Meteorological Service, the maximum registered flood level is 500.77 m. asl. which occurred on 30 December 1950. The estimated quantity of accumulated surface water was 228 million m3, covering a surface area of 8.7 km2.

The principal supply of water for the lake comes from the "Obod", "Baba Jama" and "Pribabići" Estavelles in the Upper Polje The reason for the existence of the lake is that, during periods of high rainfall in the winter months, the water input to the Polje via its springs and estavelles, is greater than the polje output via its combined ponor drainage capacity. The karst springs, ponors and estavelles are dealt with separately in these Webpages.

The guaged relationship between the head of water in the lake (H) given in metres depth and the swallowing capacity (Q) of the ponors, given in m3sec-1. is as follows :-

----------------------------------------------------
..H....................Q
-----------------------------------------------------
.0 m................20  m³ sec-¹.
10 m...............43  m³ sec-¹.
20 m...............70  m³ sec-¹.
38 m +..........120  m³ sec-¹.
-----------------------------------------------------



 
 
 
 
 
 
 

FP5.1.  HYDROMETRIC EQUIPMENT.
(Photo :  B. Lewarne, 05 March 2002.  Digital Sony FD92)
The view, looking east from Pađeni, indicates water level guages used to determine the height of the flood level,
rising up the side of the polje, from the lowest point.

FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ

The Arrival of the Periodic Flood


FP5.2. (above-left). (Photo :  B. Lewarne, 19 April 2002.  Digital Sony FD71)
The view, looking west from above Estavela "Obod", indicates a rising water level as the flood level rises in the polje.
FP5.3. (above-right). (Photo :  B. Lewarne, 19 April 2002.  Digital Sony FD71)
The view, looking east from Divin, indicating the poor weather conditions and a rising water level.
The residual limestone hill Humac, (centre-left), is nearly an island with a rapidly disappearing causeway on its western side,
nearest the camera. The "Pasmica" Ponor in the Lower Polje (middle right) is now completely inundated.
FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ

The Arrival of the Periodic Flood


 
 
 
 
 
 
 
 
 
 
 

FP5.4.  (Photo :  B. Lewarne, 19 April 2002.  Digital Sony FD71)
The view, looking from the west of the polje, indicating the poor weather conditions and a rising water level.
The residual limestone hill Humac, (centre-right), is more easily seen, together with its church on the top.
The "Obod - Baba Jama" streamway is in full spate, overflowing its riverbanks.

FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ

The Flood Abates


FP5.5.   (Photo :  Zoran Vujović, 18 February, 2005.)
The view, looking from the road above Estavela "Obod", indicating the very poor weather conditions of the 2004 / 2005 winter and a falling water level.
The residual limestone hill Humac, (centre-right), can be seen, together with its church on the top.
The Flood-level is added to by water from the melting snow.
[The break in the middle of the full-colour panoramic montage is where the photographer failed to provide either a continuous or overlap image.]
FATNIČKO POLJE - ФАТНИЧКО ПОЉЕ
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