September 2023
By Katlego Baakile
katlego@hydrocon.org
Fast Facts
WHAT IS VACUUM SEWERAGE?
Vacuum sewerage is a type of wastewater collection and transport system that differs from traditional gravity-based sewer systems. In vacuum sewerage, sewage, and wastewater are transported through a network of underground pipes using differential air pressure instead of gravity.
In a vacuum sewerage system:
Collection Points: Homes, businesses, and facilities have collection points, known as vacuum interface chambers, connecting them to the sewer network.
Vacuum Stations: Strategically placed in the sewer network contain vacuum pumps and equipment to maintain partial vacuum conditions within the sewer pipes.
Transporting Wastewater: Wastewater from collection points flows into vacuum sewer pipes, where vacuum stations create low-pressure conditions, causing wastewater to move towards these stations.
Collection at Vacuum Stations: Vacuum stations collect and pump wastewater to a central treatment facility.
Dam Levels
Dam Levels as of 25.09.2023
Dam |
Current Level (%)25.09.23 |
Last year’s level (%)25.09.22 |
Months of Supply without Inflow |
Dikgatlhong | 88.2 | 78.1 | 24 |
Molatedi | 56.9 | 39.4 | 56 |
Gaborone | 59.2 | 47.1 | 21 |
Letsibogo | 70.6 | 84.0 | 18 |
Thune | 67.8 | 67.2 | 39 |
Shashe | 78.6 | 74.9 | 20 |
Ntimbale | 79.3 | 82.8 | 15 |
Lotsane | 42.3 | 60.0 | 17 |
Bokaa | 73.5 | 74.0 | 11 |
Nnywane | 83.4 | 93.0 | 11 |
Total Dam Capacities
Source: Water Utilities Corporation
Projects
ROEDIGER VACUUM SYSTEMS COMPLETED PROJECTS
Shoshong
• Pipeline Network 55 KM
• 6 Vacuum Pumps
• 3 Discharge Pumps
GoodHope
• Pipeline Network 11.3 KM
• 3 Vacuum Pumps
• 2 Discharge Pumps
Jwaneng
• Pipeline Network 16 KM
• 4 Vacuum Pumps
• 2 Discharge Pumps
Ghanzi
• Pipeline Network 2.6 KM
• 2 Vacuum Pumps
• 2 Discharge Pumps
Selebi Phikwe
• 35 Vacuum Chambers
• 1 Vacuum station – 3 x vacuum pumps
• 1000m of discharge line to STP
Products & Services
HYDROCON WATER STORAGE

-Manufactured by Hydrocon Green
-Capacity from 17,000L to 600,000L
-Height options – 2.4m and 1.2m
-PVC lining material is standard 600gsm with UV
protection (food-grade material also available)
-Opt covers – both PVC and solid steel available

liners
-Guntex bidum bedding liner
-Double hot edge welding is done on-site
-Seams pressure tested
-Supplied, installed and maintained

-Capacities from 12kLitres up to 3301kLitres.
-Installation Time Typically (on-site work time)
-Wall structure: Zincalume® steel panels
-Liner: PVC SBS 700g or 1000g. [AS/NZS 4020:2005]
-Dome Roof: Zincalume® steel corrugated sheets.

-Panels 1.22m x 1.22m
-Cold-pressed quality steel
-All panels and internal bracings are hot dip galvanized
-Nuts and bolts are high tensile grade
-Capacity from 1.8m3 to > 2,000m3
-EDPM rubber gaskets used for all joint sealing
Rainfall
Rainy Season Data for the Months of April – June 2022
Hydrocon Green Maun Office
+267 6840259
John Wilson: john@hydrocon.org