A weir is a level control structure used to provide uniform flow. Combined sewers are pipe conveyances that carry both wastewater and storm water in a single pipe. During dry weather conditions, combined sewers discharge to a wastewater treatment plant.
What is the purpose of a water weir?
An improved weir for removal of liquid from wastewater systems which is positively driven and which decants wastewater only over a leading edge of …
Which type of Weir is used to measure discharge?
A weir system for decanting the upper layers of wastewater from a wastewater tank to selectively lower the water level in the tank, comprising, in combination: (a) a rotatably mounted header pipe extending horizontally across the wastewater tank adjacent an end of the wastewater tank below the water level in the tank for withdrawing wastewater from the tank, said pipe …
What are the types of weirs and flow over weirs?
A weir is a concrete or masonry structure which is constructed across the open channel (such as a river) to change its water flow characteristics. Weirs are constructed as an obstruction to flow of water. These are commonly used to measure the volumetric rate of water flow, prevent flooding and make rivers navigable.
What is the difference between contracted Weir and suppressed Weir?
A weir is a device used to measure wastewater flow. Weir overflow rate (or weir loading rate) is the amount of water leaving the settling tank per linear foot of water. The result of this calculation can be compared with design. Normally, weir overflow rates of 10,000 to 20,000 gpd/ft 2 are used in the design of a settling tank.
What is the purpose of weir?
A weir is a small dam built across a body of water, such as a river. We use them to help control the flow of water. Weirs can help raise the water level so that boats can pass through, and they can also reduce the flow of water to prevent flooding.
What is the purpose of a weir in a tank?
Weir tanks work by placing a fixed obstruction (i.e. a thin plate weir) within the flow of effluent. The weir is located within a chamber of sufficient capacity to enable calm and tranquil conditions within the measurement area.
What do you mean by weir?
Definition of weir 1 : a fence or enclosure set in a waterway for taking fish. 2 : a dam in a stream or river to raise the water level or divert its flow.
What is a weir flow?
Weirs to Measure Flow A weir, as defined in the USBR measurement manual, is simply an overflow structure built perpendicular to an open channel axis to measure the rate of flow of water.
What is the main difference between a dam and a weir?
The only main difference between dam and weir is that dam can store water comparatively for longer duration than weir and the dam is at more height than the weir.
What is another word for weir?
What is another word for weir?barrierwalldambarrageleveedikeembankmentobstructiongatebank15 more rows
What is weir and its types?
A weir is a concrete or masonry structure which is constructed across the open channel (such as a river) to change its water flow characteristics. Weirs are constructed as an obstruction to flow of water. These are commonly used to measure the volumetric rate of water flow, prevent flooding and make rivers navigable.
What is a weir and why it is constructed?
A weir is an impervious barrier constructed across a river to raise the water level on the upstream side. The water is raised up to the required height and the water then flows over the weir. In a weir the water overflows the weir, but in a dam the water overflows through a special place called a spillway.
What is weir in irrigation?
Weir is a low obstruction that is built across a river or canal to raise the water level, or in parallel to divert the water. Two types of weirs are used to control flow; an in-stream weir and a diversion weir.
How many types of weir are there?
1. How many types of weirs are there based on the shape of the crest? Explanation: The four types are sharp-crested, broad-crested, narrow-crested and ogee-shaped weir.
What is notch and weir?
Weirs are notches cut in a dam to discharge the surplus quantity of water. The primary difference between a notch and a weir is their quantity or scale at which they measure liquid. A notch is like a large orifice with no upper edge. The water flows over the notch or weir while water passes through an orifice.
How is a weir constructed?
How was the weir built? The site was prepared by excavating the gound to form the weir pool and the level bed of the weir. A step was cut in the edge of the river bed to form the toe of the weir. Between the first two rows of stakes, large flat stones were laid on edge across the face of the weir to prevent seepage.
What is a weir in a river?
A weir is a concrete or masonry structure which is constructed across the open channel (such as a river) to change its water flow characteristics. Weirs are constructed as an obstruction to flow of water. These are commonly used to measure the volumetric rate of water flow, prevent flooding and make rivers navigable.
What are the different types of weirs?
Types of Weirs based on Shape of the Opening. Rectangular weir. Triangular weir. Trapezoidal weir. 2. Types of Weirs based on Shape of the Crest.
What is a triangular weir?
Triangular weir: The shape of the weir is actually reverse triangle like V. so, it is also called V-notch weir. This type of weirs are well suitable for measuring discharge over small flows with greater accuracy.
What is a sharp crested weir?
Sharp-crested weir. The crest of the weir is very sharp such that the water will springs clear of the crest. The weir plate is bevelled at the crest edges to obtain necessary thickness. And weir plate should be made of smooth metal which is free from rust and nicks. Flow over sharp-crested weir is similar as rectangular weir.
What is a V notch weir?
The shape of the weir is actually reverse triangle like V. so, it is also called V-notch weir. This type of weirs are well suitable for measuring discharge over small flows with greater accuracy.
What is a T330 HydroSeeder?
Designed with time-tested features, the T330 HydroSeeder offers value, reliability and productivity to meet the needs of large-scale applications. The T330 features the highly efficient FINN proprietary centrifugal slurry pump with a 134hp John Deere diesel engine and an independently controlled pump ...
What is a 500/800 skimmer?
The light-weight and self-adjusting LWS 500/800’s are user-friendly oil recovery skimming units. The skimmers have high recovery capacity in all operating conditions and utilize the most commonly used skimming principles. The skimmers are designed to provide many years of reliable service and are low maintenance. The large diameter of the LWS’s with their free-floating weir provides ...
What is Greyline OCF 6.1?
Greyline - Model OCF 6.1 - Open Channel Flow Meter. The Greyline OCF 6.1 is an open channel flow meter that doubles as a tank level meter, making it a perfect solution for non-contacting flow and level measurement.
What is a Komara Sea Devil?
The Komara Sea Devil is a robust oil skimmer suitable for use in harsh conditions. It comes equipped with two hinged star disc banks that even operates in icy conditions. The toothed discs work to lift the oil up over raised weir lip to minimize water pick up.
What is a Hubert stoplog?
A Hubert stoplog or sluice gate closes & dewater the channel for maintenance. Stop logs and sluice gates are essential parts of a sea water intake ‘screening train’ , because it makes it possible to close and dewater the chanel for maintenance. A stoplog normally consists of a number of sections which are lowered into channels.
What is Dynasand filter?
DynaSand is a world-leading continuous sand filter developed by the Axel Johnson Institute in Sweden in the late 1970s. DynaSand is used to clean and produce water for drinking, industrial processes, waste water recycling and waste water treatment before the water is discharged into a recipient. With thousands of filters installed worldwide for municipal and industrial use, we have the experience ...
What is a tru flap?
The TRU-FLAP Floating Flap System is designed to prevent flooding and backflows caused by high downstream water levels and acts as a floating weir whose crest elevation self-adjusts. The TRU-FLAP can and has been installed at combined sewer overflow (CSO) locations, sanitary sewer overflow (SSO) locations, retention tank overflows and basin overflows. Overloading of sewer systems and sewage ...
Is ferric alum hazardous?
We all know that working with ferric or alum is hazardous work, requiring a lot of personal protective equipment to be done safely. No one likes working in the ferric or alum area.
Does phosphorus cause algae?
If you have phosphorus in your treatment plant (and who doesn’t?) you know that it can lead to algae growth, particularly in your clarifiers. Even if you treat with the traditional ferric or aluminum-based coagulants, enough phosphorus remains to give algae a foothold, threatening your compliance and coating your weirs with slimy green growth.
