The main areas on water structures
in which sediment gathers are headwater,
hollows in construction and tailwater. The
processes of accumulation of upstream and
downstream positions develop according to
duration of the object’s exploitation. This
article analyses working conditions of an
elongated pipeline of culvert in Potok Służewiecki
stream. These conditions were examined
with the aim to evaluate the degree
of discharge limitation of the object by the
pipeline executed below an old construction
of a road culvert under Łączyny street. The
object of investigation is an old culvert under
Łączyny Street to which pipeline was added.
In the assembly chamber, on the rout of pipeline,
a rainy collector is connected to the
culvert. It is characterized by high changeability
of transverse sections, bed line slopes
and hydraulic conditions. An old section of
the culvert has the largest capacity. The trash
screen is another element that considerably
reduces the capacity of the object. The tendency
to segregating rubble occurs in the
section of culvert. The largest sediments gather
in the headwater position, near the outlet
– the smallest. In the stream below the object
sediments have a similar material composition
to the one in the upper position. The theoretical
curves of longitudinal line of slope
counted with formula (2) divide the area of
Fig. 2 in three zones. On the left and below
the curve Jn37 the accumulation zone is located,
in which the movement of sediment
does not occur. Above the curve Jn60 in the
right the zone of intensive sediment transport
appears. Among the curves Jn37 and Jn60
the transitory zone is located, correspondive
to the conditions in which erosive processes
begin with growing intensity of fl ow or
accumulation processes, when fl ow diminishes. For the fl ows, for which the counted
gradient is larger than the gradient of water
surface the diffi culties with transportation of
sediment through the object may occur. In
the opposite situation the transportation should
continue without obstacles. Exceeding
this fl ow does not guarantee, however, that
an intensive carrying out of earlier accumulated
bed material happens. The appearing of
rinsing fl ows is an accelerating factor to this
process.
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