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