The rainwater collector or impluvium, probably the work of the Muradid Bey Mohamed Bey al-Mouradi (1686–1696), is an ingenious system that ensures the capture (with the slightly sloping surface of the courtyard) then filtering stormwater at a central basin furnished with horseshoe arches sculpted in white marble. Freed from its impurities, the water flows into an underground cistern supported by seven-metre-high pillars.
The rainwater collector, possibly built by the Muradid Bey Mohamed Bey al-Mouradi (1686–1696), is a remarkable system that captures rainwater from the courtyard using its sloping surface and then filters it through a central basin with white marble horseshoe arches. The purified water flows into an underground cistern supported by seven-meter-high pillars.