It is only necessary, however, to provide for these exceptional discharges during very short periods, so that the rise in the water-level of the reservoir may be taken into consideration; but subject to this, provision must be made at the bye-wash for preventing such a flood, however rare, from filling the reservoir to a dangerous height.
Above the water-level, had long been an object of local interest on account of its pits and oval hollows or sink-holes, through one of which, on the s3th of August 1878, Andrew J.
Along the central ridge, the water-level lies at a great depth from the surface (228 ft.), but it rises gradually as the country declines towards the great rivers.
The influence of wind project for laying a telegraph cable between Ireland and on water-level is most remarkable in heavy storms on the flat Newfoundland.
The summer water-level of the pasture polders south of the former Y is about 4 to 8 ft.
If, as often happens, the water-level sinks, the nests stand out higher.
In a striking form of the experiment, the water is contained, to the depth of perhaps one inch, in a large flat dish, and the operative part of the surface is limited by a flexible hoop of thin sheet brass lying in the dish and rising above the water-level.
The level at which it is desired to keep the water in these ditches constitutes the unit of water measurement for the polder, and is called the polder's zomer peil (Z.P.) or summer water-level.
Boezems, like polders, have a standard water-level which may not be exceeded, and as in the polder this level may vary in the different parts of an extended boezem.
Mortar made from pure or "fat" lime cannot withstand the action of water, and is only used for work done above water-level.