The circuit of the walls of London which were left by the Romans was never afterwards enlarged, and the population did not overflow into the suburbs to any extent until the Tudor period.
It is the source of the Rio Limay and receives the overflow from two smaller neighbouring lakes.
Each of the larger streams, as well as a large proportion of the smaller ones, is accompanied by a belt of bottom land, of greater or less width, lying low as regards the stream, and liable to overflow at times of high water.
43-409) there was ample time for cities to grow up from small beginnings, to overflow their borders and to be more than once rebuilt.
On the appearance of serious leakage the overflow level of the water originally at of was lowered for safety to gh; and for many years the reservoir was worked with its general level much below gh.
There are a number of lakes in the lowland region of the Amazon valley, but these are mainly overflow reservoirs whose areas expand and contract with the rise and fall of the great river.
They are constructed not only as navigable waterways, but also to relieve the rivers from periodical overflow, and to drain the marshy districts.
In the heart of the delta numerous large lakes or marshes abounding in fish are formed by the overflow of the Irrawaddy river during the rainy season, but these either assume very diminutive proportions or disappear altogether in the dry season.
M., and is fed by a number of small streams from the neighbouring mountains, and by the overflow of the other lakes..
Wide, which serves as an outlet for the overflow of those lakes and as a waterway for the natives who bring in flowers and vegetables for sale.
This makes a difference of level, at the outside, of six or seven feet; and yet the water shed by the surrounding hills is insignificant in amount, and this overflow must be referred to causes which affect the deep springs.
The alluvial region of the state in 1909 was mainly protected against overflow from the Mississippi river by 754 m.
Through the French territories of Cambodia and Cochin China, and to its annual overflow these countries owe their extraordinary fertility.
The great engineering works by means of which the marshes were drained and the overflow of the rivers regulated by canals went back to Sumerian times, like a considerable part of later Babylonian religion and the beginnings of Babylonian law.
Hence the regulation of the zerethra or subterranean conduits which drained away the overflow southward was a matter of vital importance both to Tegea and to Mantineia, and a cause of frequent quarrels.
The earliest effort to correct this evil was by the Dutch engineer Maartens (Span., Martinez), who planned a deep cutting through Nochistongo Hill, north of the city, to carry away the overflow of Lake Zumpango (7493 ft.
Above the timber-bearing soil along the banks, and all along the lower river the country is liable to overflow; and as the land backward from the stream slopes downward from the banks heaped up by successive flood-deposits, each overflow creates along the river a fringe of swamps.
The north-east barrier was pierced by underground passages (katavothra) which carried off the overflow from Copais.
In length, prevent the overflow of the Wabash river, which for nine months in the year is navigable from this point to the Ohio.
They overflow into the extensive clearings made by man in the primeval mountain forests.
Its lower course lies for some distance through marshes, where in times of overflow its breadth increases from the normal 700 ft.
These channels are filled, sometimes with sea-water, sometimes with overflow water from the Volga and the Kuma.
It is certain that, until the cultivator availed himself of the natural overflow of the Nile to saturate the soil, Egypt must have been a desert, and it is a very small step from that to baling up the water from the river and pouring it over lands which the natural flood has not touched.
The taper retards the motion of the water, which constantly decreases by overflow as it proceeds, whilst it continues to fill the feeder to the brim.
Piercing the desert, and at its annual overflow depositing rich sediment brought from the Abyssinian highlands, the river has created the Delta and the fertile strip in Upper Egypt.
And the reservoir lakes of the lowland plains caused by the annual overflow of the rivers.
The rainy season, or invierno, is broken by a short period of dry weather, called the veranillo (little summer), shortly after the December solstice; otherwise it rains every day, the streams overflow, land traffic is suspended, and the air is drenched with moisture and becomes oppressive and pestiferous.
Mr Whymper's explanation of the phenomenon is that the fish are scattered over the land by the sudden overflow during volcanic eruptions of the rivers and lakes which they inhabit.
In Sind and the Punjab there are many canals which act merely as distributaries of the overflow of the great rivers at the time of inundation; but where the utility of the canals has been increased by permanent headworks the supply of water is perennial and practically inexhaustible, thus contrasting favourably with the less certain protection given by tanks.
The great boundary rivers flow through low-lying valleys fertilized by their overflow or percolation, while a high bank leads up to the central upland, which, though naturally dry and unproductive except where irrigated by wells, has been transformed by various canal systems. This favoured region may be regarded as the granary of upper India.
After a long repose Ometepe also burst into renewed activity on the 19th of June 1883, when the lavas from a new crater began to overflow and continued for seven days to spread in various directions over the whole island.
With further experience it has become obvious that very few reservoirs are capable of equalizing the full flow of the three consecutive driest years, and each engineer, in estimating the yield of such reservoirs, has deducted from the quantity ascertained on the assumption that they do so, a certain quantity representing, according to his judgment, the overflow which in one or more of such years might be lost from the reservoir.
It may be at first sight objected that a case is assumed in which there is no overflow before the reservoir begins to fall, and therefore no such loss as generally occurs from that cause.
The reservoir begins to fall at the end of February, and continues to do so with few and short exceptions until the end of August, and it so happens that about the end of August this dotted line, b b representing actual cumulative demand, crosses the straight line a a of uniform demand, so that the excess of demand, represented by the slope from June to September, is balanced by the deficiency of demand, represented by the flatter slope in the first five months, except as regards the small quantity b e near the end of February, which, not having been drawn off during January and February, must overflow before the end of February.
In assuming a demand at the beginning of the year below the mean, resulting in an overflow equal in this case to b e at the end of February and increasing our reservoir to meet it, we assume also that some additional supply to that reservoir beyond the 11% of the streamflow from the driest year can be obtained from the previous year.
On a small scale, however, springs are fairly distributed over the United Kingdom, for there are no formations, except perhaps blown sand, which do not vary greatly in their resistance to the percolation of water, and therefore tend to produce overflow from underground at some points above the valley levels.
The weight of the water original salt water above the sea-level, and of the fresh below water so superimposed upon it, caused an overflow towards the sea.
But in the lower parts of the trench, where the Overflow level or later in a condition unfit for use.
In this way the rivers in the delta slowly build themselves up into canals, which every autumn break through or overflow their margins, and leave their silt upon the adjacent flats.
In years of exceptional flood the Seistan lakes spread southwards into an overflow channel called the Shelag which, running parallel to the northern course of the Helmund in the opposite direction, finally loses its waters in the Gaod-i-Zirreh swamp, which thus becomes the final bourne of the river.
The keeping of swine in a dwelling-house, or so as to be a nuisance, is made an offence punishable by a penalty in an urban district, as also is the suffering of any waste or stagnant water to remain in any cellar, or within any dwelling-house after notice, and the allowing of the contents of any closet, privy or cesspool to overflow or soak therefrom.
These are commonly called lakes, but are in reality shallow depressions receiving water from the overflow of the rivers in times of flood, and in return feeding them when the floods have subsided.