A sand-storage dam is a weir built in stages across a stream or wadi.

Dams across the river were built at Waldersea and Guyhirne, and an underwater weir was constructed below the bridge at Wisbech.

When a stretch of river is made navigable a lock is required to bypass an obstruction such as a rapid, dam, or mill weir — because of the change in river level across the obstacle.

A weir () is a barrier across a river designed to alter the flow characteristics.

They approached a weir ( a series of poles across the river, like thousands along the shore and the shoreline of the bay, across which nets could be strung ).

The Imperial Diversion Dam ( National ID # CA10159 ) is a concrete slab and buttress, ogee weir structure across the California / Arizona border, northeast of Yuma.

When the river is in spate the tunnel cannot cope and river water enters the canal, flows across the basin, and exits via the weir and manually operated gates.

Immediately across the river is the Berkshire village of Streatley, and the two are often considered as twin villages, linked by Goring and Streatley Bridge and its adjacent lock and weir.

The large bow shaped weir stretches across to Teddington from an island upstream of the lock which also acts as the centre point for the two bridges making up Teddington Lock Footbridge.

The weir is almost parallel to the lock and carries a footbridge across the river.

Bray Lock is a lock and weir on the River Thames in England near Bray and Dorney and is just above the M4 Bridge across the Thames.

The weir is almost level with the lock and runs straight across to the opposite bank from the other side of the lock island.

The weir built across the river to form the Derwent Basin still exists behind the Council House, downstream of the Exeter Bridge, and the timber causeway on trestles, which was used as the towpath, remained until 1959.

The SRWSC then constructed a weir across the river downstream of the bridge in 1954, which had the effect of funnelling even higher volumes of floodwater directly into Rainbow Creek.

In the 1270s or 80s, the Countess of Devon, Isabella de Fortibus, built a weir across the river to power her mills ( this weir is remembered in the name of the nearby suburb Countess Wear ).

The weir stretches across the river, in both counties.

The weir runs from the lock island in a long curve across the river between the two villages.

However no access is possible across the weir, and without a boat, journeys between the two villages require a lengthy detour via Reading or Pangbourne.

Mapledurham Mill is still functioning across the river from the lock, making this the only lock and weir combination on the Thames that supports the two functions that were originally the norm on river navigations.

The lock was rebuilt in 1876 and access across the weir was closed.

It was founded in 1905 as Springfield when the Natal government built a weir across the Little Tugela River.

There is a weir across the river just above the town.

At the inn, which was situated close to a broad weir, Byron was greeted by the landlord with obsequious deference and addressed as `` milord ''.

Lock 11 is unique in that the lock was built inside a bend of the river, with the weir in the bend itself.

A Channel was dug to the lock, creating an island between it and the weir.

Others were replaced by a footbridge when the weir was removed as at Hart's Weir Footbridge.

The river bank by the weir collapsed in the early 1920s, and was not repaired, resulting in the mill and cottage deteriorating and being demolished in 1927.

A weir was constructed near Fullers Bridge which converted the middle section of the river from tidal salt-water to a fresh-water area with constant water level suitable for recreational use in rowing boats and canoes.

Chalmore Lock, a summer or low-water lock and weir, was built at Chalmore Hole, Wallingford in 1838, However, much of the time the fall was only 18 inches, and the lock was open at both ends.

As the removal of the lock and weir meant that this was the longest clear stretch of the upper river, it was an ideal site for rowing, and so the Oxford University Boat Club which had long trained here built a boathouse at Chalmore in 2006.

This was a canal running from a diversion weir on the Loup River in Nance County to the Platte River about below the mouth of the Loup.

In its earliest days ( and as late as 1791 ), Fair Lawn was known as Slooterdam: a Dutch word denoting a native-American weir used to trap fish on the Passaic River.

A feeder canal, navigable to Llangollen, was constructed from Trevor to tap water from the River Dee at Llantysilio ( at the weir called " Horseshoe Falls ").

A collaboration between the Welland Rivers Trust, the Wild Trout Trust and the Environment Agency has resulted in the construction of a rock ramp, to allow migrating sea trout to pass up the river beyond the weir on the Maxey Cut, which was acting as a barrier.

An appeal to the Court of Chancery by the Commissioners also failed, and the dams were removed, as was the Wisbech weir, after an accident involving a train of lighters.

Just above Barton Mills, a side weir connects the river to the start of the Cut-off Channel, a 25-mile ( 40 km ) drain running from there to Denver along the south-eastern edge of the Fens, which was constructed in the 1950s and 1960s.

Saltford Lock and weir are overlooked by the remains of the Kelston Brass Mill, which was working until 1925.

Netham Lock and the weir form part of Bristol's flood defence mechanisms and it was announced in December 2008 that they would be upgraded as part of the £ 11 million City Docks Capital Project.

Once joined, the river flows in a northerly direction, past Fletland Mill, a former grain mill which was built in 1759, and Kate's Bridge weir, where a modern bridge carries the A15 road over it.

Originally there was a second lock at Beeston Cut to allow small vessels to enter the Trent below the weir, but this was abandoned c. 1940.

A recently opened fish pass at Monmouth allowing migratory fish to by-pass a previously impassable weir has once more given salmon and sea trout access to the majority of the catchment and salmon were seen jumping at Kentchurch weir for the first time for many years in the Autumn of 2008.

The first major MEL weir was the Clermont weir ( Qld, Australia 1963 ), if the small control weir at the entrance of Redcliffe culvert is not counted.

The other elements of the scheme include a weir on Blackmans Swamp Creek, which creates a 3 megalitre pool and the site for the first pump station, a 200 megalitre dam and two 17 megalitre batching ponds. The pumps on the creek transfer stormwater to the 200 megalitre dam at a rate of up to 450 litres per second and are designed to rapidly extract peak storm flows from the creek.

The first Australian fishsteps were built when the current concrete weir was built at the beginning of the Nepean Gorge, an anticendant entrenched meander caused by the slow uplift during the Blue Mountains orogeny carved down through the Hawkesbury sandstone ~ 50Mya.

The first phase of the project, which involved repairs to four of the five weir structures at Arborfield, was designed to create lower water levels on the section above the mill site, to reduce the risk of flooding.

A pound lock and weir were first proposed in 1833 for the " improvement of navigation two or three miles above ".

The first recorded use of the name Warwickshire being in the year 1001, named after Warwick ( meaning " dwellings by the weir ").

In the 1840s, an artificial weir was built on the natural bar of basalt boulders to provide water to the " Ceres " flour mill, one of the first in Victoria.

The first Furrow originated from the Rooirivier ( Red river ) and later a diversionary weir was built at the Camphersdrift River.

It was the first place in Australia to introduce a fish ladder next to a weir.