The average gestation period for rabbits is 31 days; however, it can vary from 29 to 35 days. Does should be pregnancy-checked 14 days after mating. If not pregnant, they can be re-bred immediately.
Buttresses and an arch of the Roselend Dam in France. A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports.The dam wall may be straight or curved. Most buttress dams are made of reinforced concrete and are heavy, pushing the dam into the ground.ater pushes against the dam, but the buttresses are inflexible and prevent the dam from falling over. Buttress or hollow gravity dams were originally built to retain water for irrigation or mining in areas of scarce or expensive resources but cheap labour.
With a buttress dam, the face of the dam is held by a series of supports or buttresses that are placed at intervals on the downstream side. The buttresses work to combat the force of reservoir water from trying to push the dam over.Sugar Hollow Reservoir Dam-White Hall, VA.s a result, this type of dam is also referred to as an Ambursen dam. Ambursenâs flat slab buttress dam design took advantage of the stabilizing effect of the vertical water load on the strongly inclined upstream face that required a minimal buttress thickness per unit of dam length.