ISKUR RIVER HYDROELECTRIC COMPLEX. (INCLUDING MAP SHOWING LOCATION OF DOME, LOCKS, AND KOTALYONE POWER STATIONS)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80T00246A042500500001-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 8
• Document Creation Date: December 22, 2016
• Document Release Date: May 14, 2010
• Sequence Number: 1
• Publication Date: June 3, 1958
• Content Type: REPORT

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CENTRAL INTELLIGENCE AGENCY
This material contains Information affecting the National Defense of the United States within the meaning of the Ssplonage Laws, This
18. U.S.C. Sees. 793 and 784, the transmisdon or revelation of Which in any manner to an unauthorised person Is prohibited by law.
~OCESSING COPY,
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COUNTRY B
ulger is
SUBJECT I
skur River Hydroelectric Complex. DATE DISTR.
3 June 1958
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REFERENCES
DATE OF
INFO.
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PLACE &
DATE ACQ.
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ARMY AVY IR sI
(Note: Washington distribution Indicated by'T j Field dhdribetion by
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Summer
1957 New basin and hydroelectric plant of Kokalyane (a place not
indicated on the available map and located along the Iskur River, about
25 kilometers southeast of Sofia). ?.
The stretch of the Iskur River from about 4 kilometers south of
Gorublyane up to the gorge (included) of Dolni Pasarel has been
dev~iQ ec~.
artificially eii in such a way as, to obtain a series of basins
for the i^i purpose of
a now hydroelectric plant
and also for providing a considerable water reserve for irrigating the
Sofia countryside.
afterw
The favorable variations of climate in the area nil be indirectly
exploited for creating a health and snorer resort in the vicinity, to
be Balled the *Sea of Sofia. "
The hydroelectric plant Ia teheduled to go into operation in 1958
and the irrigation works are also scheduleto be completed in 1958.
The creation of the health and summer resort is to be begun in 1958.
Work on the project was begun in 1953 and was officially concluded
in the spring of 1957. The hydroelectric power plant, however, is not
yet in operation.
7
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The entire system of dams and basins is called the "Barrage Stalin."
The of the work is evident from the sketch in enclosure No. 1,
on which the following numbers indicate the various details of the
project as described below :
1. Earthen dam delimiting the waters of an artificial lake, which
is to serve as a final reservoir for irrigating the Sofia countryside
by means of artificial canals. At present his lake measures only about
250 by 250 meters, because upstream the yfater of the Iskur River is
flowing into the main reserve basinhe depth of the lake is not known.
2. The artificial lake just mentioned.
3. A lock abreast the village of Pancharevo.
4. An uncovered concrete canal about 5 meters wide and about
7 or 8 kilometers long. This canal carries the water flowing down from
the hydroelectric power plant upstream into the lake at No. 1. The
water from the overflow - when the look at No. 3 is put into operation
will flow back into the Iskur River.
5. Foot bridge.
6. New hydroelectric power plant of Kokalyane, whowAM
about 400 meters southeast of the village. The structure is located
on a mountain slope which comes right up against it. On observing it
one has the impression that half of the plant is underground.
The building has a front of about 50 meters and is a 3-story
(at least that is the way it looks from the outside). It is already
pV
equipped with transformer e+,.
The power plant is not yet in operation but it is said that it is scheduled to
maiimol~ begin operating in 1958, when the canal works for the
irrigation of the Sofia area will be completed.
Z/
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of 250,000
the power plant will have a capacity
7, Two pressure conduits running along the slopes of the mountain, part
r underground an*4bove the surface. These are steel conduits
with a diameter of about 1.5 meters; their length is not known. The
volume of the flow is not known.
8. Lock
9. Electric power line, already in place, with the cables.
On the mountainous part, most exposed to thew It is strung on
steel trellises On the level land, where there is less wind, it is
lon
py
hung on concrete " shaped like this . The insulators are
arranged like spark plugs, each equipped with 5 or 7 25X1
porcelain disks. 25X1
10. Concrete dam about 30 meters high, about 60 meters long, and
about 3 meters wide at the (.lL4'
11. Feeder basin about 100 meters long, about 40 meters wide,
and of undetermined depth.
12. Dam of Iezovir (a place not indicated on the available map,
about 30 kilometers from Sofia on the road leading to Samokov),
containing the real main reserve basin. It is a concrete dam about
80 meters high on the downstream side; on the
basin side the water is 70 meters deep. The dam is about 100 meters
c tQ
long and the width at the top-is about 20(?) meters, plus two sidewalks,
each about 2 miters wide.
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13. Three steel locks with floodgates operated by hand winches.
These locks are each about 2 meters wide. A discharge canal carries
the overflow back into the Iskur River.
14. Artificial basin of Iezovir. This basin is about 5 kilometers
long and about one kilometer wide.
about 70 meters deep at the dam.
Note: Because of unforeseen and considerable natural seepage
in the basin, the water level is not rising as rapidly as was calculated.
00% #
Topographic ; Following the creation of the main
basin, three villages
have been submerged. The inhabitants
were moved to the Dobruja area.
The highway to Samokov has undergone a changes- it now runs almost
the entire distance on the left bank of the Iskur. The stretch from
the Iezovir dam to Samokov has been newly laid, since the previous road
bore was submerged. The road is about 6.5 meters wide and is mob of the
paving block type.
Miscellaneous: There is a good deal of natural seepage in the
bed of the Iskur River and it is said that the remaining stretches,
where various waters flow, will all be artificially canalized in the
near future.
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LEGEND aii No , l
1. Earthen dam.
2. Artificial lake.
3. Lock.
4. Exposed artificial canal.
5. Foot bridge.
6. New hydroelectric paler plant of Kokalyane.
7. Pressure ...i.Mri..bjp.
8. Lock.
9. Electric paler line.
10. Dam.
II. Feeder basin.
12. Iezovir dam.
13. Locks.
14. Artificial basin of Iezovir.
IIRArra ~ A"'
4 i
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