Opinion articles discuss a topical aspect of hydrology. These articles are discussed openly in HESSD or EGUsphere so as to stimulate an open debate among peers on new ideas, views, or perceptions in hydrology. Opinion articles will be published under the heading "HESS Opinions" and are handled by the executive editors. Opinion articles are generally invited, but authors with ideas for an opinion paper are encouraged to contact one of the executive editors.

Opinion articles discuss a topical aspect of hydrology. These articles are discussed openly in HESSD or EGUsphere so as to stimulate an open debate among peers on new ideas, views, or perceptions in hydrology. Opinion articles will be published under the heading "HESS Opinions" and are handled by the executive editors. Opinion articles are generally invited, but authors with ideas for an opinion paper are encouraged to contact one of the executive editors.