The Detention Weir Wall Is Positioned in the Entrance Channel to the Detention Pond
RSA WEIR WALL/DETENTION BASIN FLOOD CONTROL SYSTEM The RSA Weir Wall/Detention Basin Flood Control System is designed to divert and so regulate the flow of flood water in streams to prevent downstream flooding and property damage during abnormally heavy rain events. The system is designed to meet the ASCE 7 Minimum Design Loads for Buildings and other Structures and the FEMA 55 Coastal Construction Manual as applicable. The systems are designed and engineered based on hydraulic and hydrology analysis of the location and the local soil conditions. The RSA Weir Walls/Detention Basin system consists of a Canal Weir Wall structure stretching across the stream with one or more movable gates. The height and width on the dam structure depends on the stream dimensions and the amount of water to be retained. The number and size of gates will depend on the desired flow rate. An adjacent Detention Pond Weir Wall is positioned in the excavated connection between the canal and the pond. The Detention Weir Wall structure incorporates one or more weir gates to control the flow into and out of the detention pond. Additionally, there are a series of sluice gates connecting the detention pond to the canal which will allow a controlled water flow between the pond and the upstream and downstream canal. Early on in the storm cycle as the water level in the stream rises higher than normal, water is allowed to flow into a connected detention basin. The Detention Basin may be excavated below the channel’s depth to increase the volumetric storage.
The Detention Weir Wall is positioned in the entrance channel to the detention pond. The detention weir wall is a concrete dam structure spanning the entrance. The detention gates are positioned flush to the bottom of the entrance channel to allow the maximum amount of water to flow into the detention pond. With the gates in the retracted or open position, the water will flow
Patent Pending unimpeded into the detention pond. Once the maximum water level is reached, the detention gates may be closed to hold the water in the detention pond for release back into the main stream once conditions improve. The water can be released slowly through sluice gates or more quickly by lowering the weir gates.
OPERATIONS During a storm, the Canal gates are closed to back up water. Once the water level rises to the detention entrance level, water will flow into the pond through the gates. Once the maximum water level is reached, the detention gates are closed to hold the water. The stored water can be released slowly through sluice gates or more quickly by lowering the weir gates back into the main channel. The Canal gates will open to allow flow downstream as conditions improve. The control architecture allows real time water control as conditions change balancing the upstream canal water level, downstream canal water level and detention pond level to achieve the best balance. RSA DUAL WEIR WALL/DETENTION BASIN FLOOD CONTROL SYSTEM BLOCKS AND DIVERTS UPSTREAM RIVER WATER TO PREVENT DOWNSTREAM FLOODING
MAXIMUM WATER LEVEL NORMAL FLOW 1 SYSTEM BASIC ELEMENT ARRANGEMENT
2 STORM WATER BACKS UP BEHIND CLOSED CANAL WEIR
STORM WATER IS DIVERTED TO THE DETENTION POND
3 DETENTION DISCHARGE GATE FLOW BLOCKS TO PREVENT SCOURING
DETENTION WEIR SHOWN OPEN
4 CANAL WEIR WALL- OPEN
WATER BACKING UP BEHIND CANAL WEIR 5 NORMAL WATER FLOW SLUICE GATES OPEN
WATER LEVEL REACHES THE DETENTION LEVEL
6 DETENTION WEIRS AND GATES BALANCE THE WATER LEVEL IN THE CANAL
7 DETENTION WEIRS AND GATES BALANCE THE WATER LEVEL IN THE CANAL
8 SYSTEM CONTROL ARCHITECTURE ALLOWS REAL TIME CONTROL OF CHANGING CANAL WATER CONDITIONS
9 CANAL SLUICE GATES AND WEIR GATES CONTROL THE WATER DISCHARGE DOWNSTREAM
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