INGENIEUR
Figure 4.5 : Replacing swale with box culvert due to site constraint
Figure 4.6 : Replacing swale perimeter drain with concrete drain
For example , the width required for swale may lead to insufficient design requirements for other infrastructures . At Site B , the designed swale of type A with an overall width of 2.0m led to insufficient width required for parking lots and road width adjacent to the Assembly Hall ( Figure 4.5 ). Design modification was done by replacing the BIOECODS swale with a 300mm box culvert beneath parking lots .
A similar solution was identified at the Male Hostel at Site B ( Figure 4.6 ). The swale designed as perimeter drain at the courtyard area has resulted in a deep invert level , which could further lead into a deeper invert level and increase in the swale width for the main drain .
The provision of road crossing will require designers to check on the final invert level of the
Figure 4.7 : Excavator during swale construction ( Site B )
66 VOL 88 OCTOBER-DECEMBER 2021