Cluster 4 - Lubisi Scheme: Water Treatment Works, Pumping Stations, Primary Steel Pipelines and Reservoir to Sikungwini.
BVi was responsible for the full scope design of civil and structural elements of the water treatment works. 8.4km of 350mm ø steel pumping mains, 1.2km of 350mm ø PVC pumping mains, Three pumping stations, varying in capacity between 106 ℓ/s and 4.5 ℓ/s, 3 concrete reservoirs: 1.25 Mℓ, 300 kℓ and 200 kℓ
Construction of new pipelines and associated valve chambers, crossings etc.
Design consultants for a 12 Ml reinforced concrete Reservoir for NamWater in the town of Rundu.
The geotechnical conditions were extremely difficult and the Rapid Impact Compaction method was used to improve soil conditions to achieve the required bearing capacity. This reservoir is some 53m in diameter and 6m high. Construction is progressing well at this point in time!
Construction of 4.3km 80 mm dia/ 100mm Dia Ductile Iron, 8km/ 110mm Dia PVC, 3km/ 160mm Dia MPVC, 5km/ 250mm Dia PVC pipeline from various boreholes to and from a newly constructed 1.6ML Reinforced concrete Reservoir, 2 new Booster pump stations equipping of 5 boreholes, valves, chambers etc
Blocuso irrigation dam is lined with HDPE pipelines and has capacity of 22,5 mega litres. The Dam has storage capacity for 18 hours for the total 216 ha.
Earthworks during construction of the Blocuso Bulk Irrigation Scheme. The infrastructure is designed to supply irrigation water to 216ha newly established vineyards.
River embankment protection at Farm Raap-en-Skraap near Onseepkans. Water for approximately 300ha of export quality table grapes is abstracted at Raap-en-Skraap. The embankment protects an inlet canal from where water is abstracted with multiple pumps. The embankment juts out into the stream and without protection is vulnerable to erosion due to the high water velocities in the river. The project was funded by the farm owners Keboes Fruit Farms which is a subsidairy of Karsten Farms (Pty) Ltd.
The Sedibeng pipeline project is funded by Department of Water and Sanitation. The project entails the upgrading of existing 120km pipelines from the Treatment Plant at Henkries alongside the Orange River to Springbok. The works include the replacement of existing pipelines, upgrading of 4 main pumpstations and construction of concrete reservoirs. The installation of new pipelines to the communities of Concordia, Carolusberg and Nababeep is also part of the project. The approved budget for the project amounts to R500m. The first phase of the construction of the main pipeline will be completed in May 2016. The planning and design of the next phase is already in an advanced stage and construction will commence middle 2016.
Graaff-Reinet Water Augmentation Scheme for Drought Relief
Construction of a 600mm diameter steel potable water line for 6.7km, supplementing the Port Elizabeth bulk supply from Churchill Dam
350m of 315mm diam PVC sewer, 450m of 450mm diameter and 1 400m of 600mm diameter ductile iron sewer
The project includes the full consulting engineering services for the following: (1) 4 800m of 600mm dia GRP main water carrier (2) New pump station for the extraction of 2 100 m3/hr (3) New filtration installation for 2 100 m3/hr 4) New 40ML earth-lined storage reservoir
This project was initiated due to the increasing frequency of algal blooms in the Orange River due to eutrophication. The high occurrence of algae tends to block sand filters hindering the production of potable water. A dissolved air flotation plant was constructed to remove the algae from the water.
This facility consists of the following structures or process units:
Bulk water supply from the Orange River to the town of Kenhardt and Lennertsville Village. Project comprised the following major components: Raw water abstraction pump station, 3km raw water rising main, 2.4 Ml/day water treatment plant, booster pump station, 28km rising main, 300kl elevated reservoir, 48km gravity main, MV power supply line, telemetry system.
This contract is for the supply of materials, equipment, plant and labour for the construction of an earth dam reservoir, receiving water for the Kalahari East Pipe Line, a 117m x 98m rectangular earth reservoir (33 200 cubic metre) HDPE lined earth dam with floating HDPE roof cover.
The project is about conducting feasibility studies on river structures and investigation on the Skoenmakers River which has been utilised as a conveyance system and spillway to Darlington Dam since 1981. The feasibility studies are necessitated by deterioration of the river channel over the years which have resulted in the erosion of the river embankments, creation of an island in the river bed, loss of vegetation, erosion of some bridge-supporting embankments and transportation of vegetation and silt downstream. Investigate the impact of water releases down the river bridge and compilation of a river rehabilitation strategy to improve access across the river and to halt further degradation of the river.
The aim of the assignment is to assist the National Water Resources Infrastructure (NWRI) in understanding the impact of water release down the Skoenmakers River in an effort to have intervention measures put in place to upgrade the river bridge structures and prevent further deterioration of the river embankments and bed to minimise the loss of human lives, livestock and wildlife in the area.
Formulation of Storm Water Management Plan:
1 ) Identify clean and dirty water areas according to GN704
2) Build a numerical hydrological model of the RLT complex in PCSWMM to quantify the runoff volumes for a 50y storm event
3) Identify and design required infrastructure like pollution control dams on a conceptual design level
4) Define scope of work of the following phases that will be required for RLT to become GN704-compliant
Relocation of concrete-lined channel (4.5km long). Construction of three reinforced concrete culverts (each 60m long). Bulk earthworks design haul roads, concrete silt traps, concrete canal access ramp. Construction of 4.8km steel pipeline above ground.