Miljøforhold i elva som varierer systematisk

Regler for bruk <svg data-icon="" fill="currentColor" aria-hidden="true" preserveAspectRatio="xMidYMid meet" data-license="Apache License 2.0" data-source="Material Design" viewBox="0 0 24 24" class="eqszgqi0 css-z5tn7-StyledIcon-nsmall-StyledChevron e1fbf8js0">