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  • River Foreland Development in the Kovin Area

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Projects River Foreland Development in the Kovin Area
River Foreland Development in the Kovin Area PDF Print E-mail

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Client: Electric Power Industry of Serbia/Iron Gate Hydroelectric Power    Plants LLC
Chief Design Engineer: Zoran Gavrilović, FE
Design Engineers: Renata Puzović, FE; Mileta Milojević, FE

River foreland is unprotected land between a river and a dike, which is generally used to grow trees. The purpose of foreland forests, in addition to timber production and dike protection from high flows, flood waves and ice, is to considerably reduce dike lining and maintenance costs.

The change in the water regime and protracted floods due to the operation of the Iron Gate 1 HPP are threatening the survival of foreland forests, especially forest belts adjacent to dikes, since these sites were originally used to borrow material for the erection of dikes and were later afforested.

The terms of reference and work program for the preliminary and detailed designs under this project for the development of the Danube River foreland in the Kovin area called for forest restoration along a particular foreland stretch.

 

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The preliminary design addressed economic viability of land filling, using material dredged for Danube waterway maintenance. Backfill elevations were defined based on flood durations in the vegetation period, which are 55 days for poplars and 85 days for willows. Flood durations were established for seedlings, because of their short height and vulnerability to protracted floods. Selected criteria were a result of long-term monitoring of foreland forests. Such criteria are generally used in forest management planning.

Since elevations differed by 20 cm depending on the type of tree, the scenario which required a higher backfill elevation (poplar) was selected, to allow for more profitable poplar-forest plantations to be established.
For purposes of the preliminary and detailed designs, assessments and analyses addressed natural characteristics, geological and pedological soil composition, the condition of forest vegetation, and the duration of hydrologic events.

The foreland was surveyed in detail to produce a digital model of the terrain.

The project also called for the rearrangement of a large trench leading to the reservoir, to provide a fish-breeding site. In addition, a canal was designed to drain the foreland, to maintain water levels, and to act as a fishway.

 

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