TENDER NO. 01-15/16 MOSSEL BAY: UPGRADING OF STORMWATER: IN MOSSEL-, KIEWIET-, CUPIDO-, SINKFONTEIN-, EILAND- AND BAKKE STREETS

• The project required the upgrading/altering of the existing stormwater system in D’Almeida in the vicinity and adjacent to Mossel Street and Bakke Street.
• The slopes of the network are very steep and super critical flow with high flow velocities were calculated throughout the system.
• This required extra care and necessitated to switch the design from 2D computer modelling to 3D modelling, done at Stellenbosch University.
• Max flow velocity = 16 m/s.
• System required two SAF Stilling Basins, one to handle 3,4 m³/s through 90° bend and another to break energy of 4,4 m³/s x 11,0 m/s flow.