In 1841 Elizabeth Riach 70, head of household, is still at the Haugh, Rothes with Margaret Riach 30, Isabel Bremner 70 and a 17 year old servant Jannet Cruickshank. This is remarkable given that the farmhouse was destroyed in the Great Moray Flood of 1829. It is possible that there is another Riach farmhouse in the Haugh which could have been swept away although Freecen only has two dwellings under that name in the 1841 census so it is unlikely. In his "Recollections of a Speyside Parish" James Thomson remembers the flood at Rothes:
Below us lay the fertile and once beautiful haugh of Rothes. The rich crops of corn and hay that made it a joy to look upon were buried beneath stones and gravel or swept to the sea by the raging flood. The ruins of Widow Riach's farm-house at the upper end of the haugh completed the picture of desolation. The village houses seemed deserted, and their straw thatched roofs looked like clay huts. The crops in the gardens lay beaten to the earth. A great chasm of stones and gravel marked the course of the burn that divides the village into two parts. The bridge that crossed it was entirely swept away, thus preventing communication by wheeled vehicles from either side. On the opposite side of the river the beautifully wooded banks below Arndilly were converted in many places into naked yellow crags. In whatever direction our eyes were turned nothing but ruin and desolation was seen.
There is a vivid description of the event and the rescue of the family in Thomas Dick Lauder's "The Great Floods of August 1829 in the Province of Moray and Adjoining Districts" pages 220-223 which can be read on-line. archive.org/details/greatfloods. I'm hopeless at posting links. Maybe someone can add it properly for me.
Scotlands People have a George Riach dying in Rothes in 1821, possibly the husband of Elizabeth.