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Cross-Vane Weir Diversion POLLUTANTS ADDRESSED: Sediments

DESCRIPTION: The cross-vane weir is a diversion dam intended to channel water to an alternate waterway such as an irrigation canal, another stream, or a water spreading system. It is built in a V-shape and angled upstream.

POTENTIAL TREATMENT AREAS: Streams

LOAD REDUCTION MECHANISM: Sediment Reduction - Diverts stream flow while maintaining the transport of flood waters and sediments. The geometry increases flow and velocity in the center of the river maintaining sediment transport.

ALTERNATIVE MANAGEMENT MEASURES: Grazing Management Water Facilities Irrigation Water Management Irrigation Pipeline

LAND USE CLASSIFICATION: Disturbed areas Agricultural lands Grazing lands

PERMITTING REQUIREMENTS: Permits are required under Sections 404 and 401 of the Clean Water Act. Water diversions are based on a water right administered by state and/ or federal agencies. Contact ADWR for additional information.

ADDITIONAL BENEFITS: The weir helps stabilizes the stream channel.

Arid Southwest BMP

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Cross-Vane Weir Diversion POLLUTANTS ADDRESSED: Sediments

Level 500: INTENSE ENGINEERING LOAD REDUCTION POTENTIAL: LOW

MEDIUM

The effects of this practice on water quantity, water quality, and the environment should be considered during the planning process.

HIGH

Some effects to be considered are:

ESTIMATED TIME FOR LOAD REDUCTION: IMMEDIATE

MONTHS2 YEARS

1. Effects on the water budget, on volume and rate of runoff, infiltration, evaporation, transpiration, deep percolation, and ground water recharge.

> 2 YEARS

EXPECTED MAINTENANCE: LOW

MEDIUM

2. Effects of the use of diverted waters for irrigation.

HIGH

3. Effects on the original watercourse, on the newly constructed watercourse, and on the area where the water is being diverted to and from.

ESTIMATED COST: LOW

MEDIUM

HIGH

4. Effects on erosion and the movement of sediment, pathogens, and soluble and sedimentattached substances carried by runoff. 5. Effects on the natural migration of fish. Riparian Planting Zone: Base flow. .

PLANNING AND IMPLEMENTATION: Arid Southwest BMP

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Cross-Vane Weir Diversion