The water-management system improvements include master drainage planning, pre-project water quality and wildlife monitoring, computational fluid dynamics modeling, permitting, construction of crenels
and baffles to slow water moving through existing ponds and the design and construction of automated water-monitoring systems.
Tourbillon castle built at the end of 13th century (1290-1308) by the bishop Boniface de Challant; mainly destroyed in 1461 by Patriots of the Valais; rebuilt about 1477 by the bishop Guillaume VI of Raron, with in particular chapel and a wall equipped with crenels
. In 1788, a gigantic fire reduced however the castle in ashes; it was its loss.
Some were sited directly in the landscape; others hung from crenels
or windows, whether outside the palace or in a small structure in the middle of a lake, carrying on a dialogue with the architecture and the sky, competing with the stars.