Placement of spawning gravel in the river

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Introduction

File:Spawning gravel eggs.jpg
Figure 1: Salmon eggs in gravel.
Figure 2:
Figure 3: Excavator placing spawning gravel in a river.

Methods, tools, and devices

During planning

During implementation

During operation

Classification Table

Classification

 

Selection (multiple)

Fish species measure designed for

All

Does the measure require loss of power production?

Structural (requires no additional flow release)

Recurrence of maintenance

Less often than yearly

Which life-stage of fish is measure aimed at?

All

Which physical parameter mitigated?

 

Substrate

Water temperature

Water velocity

Water depth

Hydropower type the measure is suitable for

Plant in dam

Plant with bypass section

Dam height [m] the measure is suitable for

All

Section in the regulated system measure is designed for

Bypass section

Downstream outlet

River type implemented

 

Fairly steep with rocks, boulders (< 0.4; > 0.05 %)

Slow flowing, lowland, sandy (< 0.05 %)

Level of certainty in effect

Moderately certain

Technology readiness level

TRL 9

 

actual system proven in operational environment