The order is implemented as part of the project "A comprehensive project of forest and forestry adaptation to climate change - low retention and counteracting water erosion in lowland areas".
The project is co-financed from the funds from the European Community budget (Cohesion Fund) under the Operational Program Infrastructure and Environment 2014-2020)
The investment is carried out in order to build up and retain inland surface waters through the construction of equipment for the regulation of flows on existing, reconstructed drainage ditches in the Rudy River catchment in the State Forests of the Szprotawa Forest District. The entire investment will be implemented in three stages, however, this tender procedure covers the first two stages.
Stage I - Task No. 1, within which the construction of retention devices for small retention and six pond objects together with the reconstruction of drainage ditches with a length of 14.5 km, designated as R44 in the catchment ID16544 - "Inflow from the Bobrowic Ponds" and ID91601 - " Bobrowickie ponds, from km 0 + 100 to 5 + 608 of the R44-0 detailed ditch and its tributaries from R44-1 to R44-10 (without pond 6 and ditch R44-6-1).
Task No. I includes:
A) Maintenance of pond / tilting ponds, strengthening of dikes with a hermetic wall:
- hm 24 + 90.00-MNICH MN2 Staw No. 4, part of the flight. DN600 mm from PP or PE, stacking height H = 0.97 m,
- hm 23 + 11.00-MNICH MN1 of No. 5, part of the flight. DN600 mm from PP or PE, stacking height H = 0.99 m;
B) Renovation of existing pond and damper structures:
- hm 42 + 90.00-MNICH MN5 Pond No. 1, reinforced concrete, part of the passage. DN600 mm, stacking height H = 0.99 m,
- hm 38 + 77.00-MNICH MN4 Pond No. 2, reinforced concrete, part of the passage. DN600 mm, stacking height H = 0.94 m
- hm 27 + 80.00-MNICH MN3 Pond No. 3, reinforced concrete, part of the flight. DN600 mm, stacking height H = 0.93 m,
- hm 20 + 68.00 - object made - threshold PR1 of the pond No. 6, dirt, width 2.0 m, height of damming H = 2.12 m;
C) Designed water devices on ditches:
- DN600 mm culverts with medium length L = 8.0 m with maximum damming H = 0.6 m, piece 17,
- DN600 mm culverts with an average length of L = 8.0 m without stacking, 1-2% drop; items 12,
- reinforced concrete / stone valves with maximum damming H = 0.8 m 2,
- stone steps with maximum damming H = 0.4 m, pcs. 10;
D) Reconstruction of ditches according to designed cross-sections and slopes, including silting and deepening ditches existing on the length of about 14.5 km, with longitudinal slopes 0.2% - 0.4%, slopes 1 / 1.5;
E) Measuring devices, in the bottom of the Stawów Bobrowickie, it is planned to install six water level gauges in order to determine the water level, with a plate indicating the capacity of the pond, ie the maximum level of damming up. As part of the investment, it is planned to obtain pond retention of about 315.1 thousand. m
Bobrowicki Pond No. 1 - area of 11.2 ha, damming level of 132.90 meters above sea level on a monk - H = 0.99 m.
Bobrowicki Pond No. 2 - 5.1 ha, damming level 132.80 meters above sea level, on the monk - H = 0.99 m
Bobrowicki Pond No. 3 - area of 3.7 ha, damming level 129.70 mnpm, on the monk - H = 0.96 m
Bobrowicki Pond No. 4 - 4.1 ha, damming level 129.30 mnpm, on the monk - H = 0.97 m
Bobrowicki Pond No. 5 - area of 2.3 ha, level of damming 129.00 meters above sea level, on the monk - H = 0.99 m
Bobrowicki Pond No. 6 - area 3.9 ha, damming level 128.90 mnpm, on the threshold - H = 2.12 m - object made.
Stage II - includes Task No. II, under which the construction of retention facilities for small retention with the reconstruction of drainage ditches with a length of about 13.7 km, marked as R46 - section ID16546 - "Inflow from Śliwnik" in km from 1 + 570 to 4 +000 detailed R46-0 ditch with its tributaries from R46-1 to R46-10 and R45 - ID16545 - "Ruda from the tributary from the Bobrowicki Ponds to the end. from Śliwnik "in km from 0 + 561 to 4 + 650 detailed ditch R45-0 and its tributaries from R45-1 to R45-12.
Task No. II includes:
A) Designed water devices on ditches:
- DN 600 culverts with medium length L = 8,0 m with maximum damming H = 0,6 m, piece 14
- DN 600 culverts with an average length of L = 8,0 m without stacking, 1-2% drop; items 16
- reinforced concrete / stone valves with maximum damming H = 0.8 m pcs. 8
- stone steps with maximum damming H = 0.4 m, piece 15;
B) Reconstruction of ditches according to designed cross-sections and inheritances, including silting and deepening ditches existing on the length of about 7.0 km for R46 and 6.7 km for R45, longitudinal slopes 0.2% - 0.4%, slope slopes 1 / 1.5. Valves and culverts with damming will fulfill regulatory and retention functions and retention thresholds. Within the planned devices, it is planned to reconstruct slopes and embankments.