Placement of spawning gravel in the river

Introduction

File:Spawning gravel eggs.jpg

Figure 1: Salmon eggs in gravel.

Figure 2:

Figure 3: Excavator placing spawning gravel in a river.

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