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Instructions for Authors


General Information

Open Access

All accepted Hydrology Research papers are published Open Access, and freely available on our website upon payment of the Article Processing Charge (APC). For more information and a full list of IWA Publishing APCs, click here.


Usage of papers published open access by third parties is defined by the type of Creative Commons user licence selected by the author (see all options on our Open Access page).


Upon acceptance of an article, authors will be asked to complete an 'Exclusive Licence Agreement' (for more information see our Rights and Permissions page). Permitted third party reuse of open access articles is determined by the author's choice of user licence.


IWA Publishing supports authors in the developing world through its relationship with Research4Life. Authors from Research4Life’s Group A list are exempt from payment of the APC and authors from Research4Life's Group B list are entitled to a 50% APC waiver.


Ethics in Publishing

You will be required to accept the IWA Publishing Ethics Statement for Authors when you submit your paper to the journal. The statement covers authorship, originality and conflicts of interest. Please read this statement to ensure your submission complies.

Note that conference proceedings are a form of publication.

To verify originality, your article may be checked by the originality detection service CrossCheck.


Ethics: AI Tools

IWA Publishing allows the use of AI tools used within a manuscript, but does not allow for AI-generated content to be used in the place of human authorship.

  • Authors will be held liable for any errors, potential plagiarism or inconsistencies introduced by AI tools.
  • Authorship must be verifiable, which is not possible from an AI tool or content generator.
  • If AI tools are used on an article submitted to IWA Publishing, their use must be clearly explained within the methodology section.

If AI-generated content is included within a manuscript without explanation, this will be grounds for rejection of the work at the discretion of the Editorial Board.


Author Rights

For the rights of the author to reuse your work, please refer to the Rights and Permissions page.


Role of the Funding Source

You are requested to identify who provided financial support for the conduct of the research and/or preparation of the article and to briefly describe the role of the sponsor(s), if any, in study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the article for publication. If the funding source(s) had no such involvement then this should be stated.


Author's Discount

IWA Publishing journal authors are entitled to a 25% discount on IWA Publishing books and reports.


Author Inquiries

For further advice please contact:

Journals Office, IWA Publishing, Republic - Units 1.04 & 1.05 Export Building, 1 Clove Crescent, London, E14 2BA

Tel: +44 (0)207 654 5500; E-mail



Types of Paper

(a) Research Papers: These papers are fully documented, interpreted accounts of significant findings of original research. The maximum acceptable length of a Research Paper is 7500 words (less 350 words for each normal-sized figure or table you include).

(b) Review Papers: These are critical and comprehensive reviews that provide new insights or interpretation of a subject through thorough and systematic evaluation of available evidence. They should not normally exceed 8000 words. Manuscripts exceeding 10,000 words will not be accepted for review.

(c) Comment Papers: A Comment Paper which discusses a paper previously published in Hydrology Research should only be submitted after consultation with one of the journal Editors.

(d) Invited Papers: Occasionally authors may be invited by the Editors to submit a paper on a particular theme.


Use of Word Processing Software

The preferred format for electronic versions is Microsoft Word, though we can accept most other word-processing packages. Authors should not add their own macros. Please supply only the final version of your file (with no hidden text), to avoid any risk of old versions of the text being used in error.


The source files of figures are required if a paper is accepted and you should embed the figures in the main text (see below).


Article Structure

The main text should be double spaced.

Do not number or letter section headings.

Use line numbering throughout your paper, and number the pages.

We expect all figures and tables to be embedded within the text.

Please ensure your submission meets the recommended word limits. A short, concise article is more likely to attract readers. In general, a research article should contain:

  • Figures: 6-8
  • Tables: 1-3
  • References: 25 – 50

Additional figures and tables may be added to Supplementary Material. Manuscripts which exceed the guidelines above may be rejected by the Editors.

Papers should be well structured; they must comprise:

  • Title
  • Short title of no more than 80 characters
  • Author name(s), full postal and email addresses for each author. Please indicate who the corresponding author is.
  • Abstract: No more than 200 words briefly specifying the aims of the work, the main results obtained, and the conclusions drawn. Citations must not be included in the Abstract.
  • Keywords: Up to 6 keywords (in alphabetical order) which will enable subsequent abstracting or information retrieval systems to locate the paper.
  • Highlights: Up to 5 numbered points which describe the novelty and/or the impact of your research. The highlights should help increase the discoverability of your article. Ensure the highlights are, concise, easy to read, and include key search terms (you should not simply rewrite the abstract).
  • Graphical Abstract: This should offer readers an at-a-glance visualisation of your paper via a single, concise image. Graphical abstracts are optional, but helpful for readers and for the promotion of your paper.
  • Main text: For clarity this should be subdivided into:

Introduction: Should include a brief description of the background context for the work including research rationale/context, clearly identifying the scientific question(s) and their international (or regional) significance. It should include a succinct review/state-of-the-art synthesis of the directly relevant published international literature. The research aims and objectives should be clearly stated.

Study area and data: Should describe the location, size, geographical and relevant climatic and other conditions of the region. It should clearly describe all the data used and their sources, including data periods, temporal resolution, limitations, quality, etc. Use of tables is encouraged where appropriate.

Methods: A brief description of the methods/techniques used (the principles of these methods should not be described if readers can be directed to easily accessible references or standard texts).

Results and Discussion (or in two separate sections named Results and Discussion, respectively): A clear presentation of experimental results obtained, highlighting any trends or points of interest. In the Discussion, a brief explanation of the significance and implications of the work reported, focusing on the novel contributions or new insights offered to the science and practice of hydrology.

Conclusions: A brief statement of what was undertaken in the study (one or two sentences) followed by what was established relative to the stated aims and objectives. Where relevant this should include a brief summary of your argument. Where appropriate, clearly identified recommendations for action and/or research needs should follow.

  • References: These should be to accessible sources. Please ensure that all work cited in the text is included in the reference list, and that the dates and authors given in the text match those in the reference list. References must always be given in sufficient detail for the reader to locate the work cited (see below for formats). Note that your paper is at risk of rejection if a disproportionate share of the references cited are your own.
  • Supplementary Material: Appendices and other Supplementary Material are permitted, and will be published online only, in the exact format in which they are submitted. Any supplementary material should be included during the submission process for evaluation by the reviewers.
  • Data: We encourage authors to make the dataset on which their paper is based available to access. Authors may upload all data related to the results reported in the manuscript as supplementary materials with the submission, or provided via a URL to a public repository.  Data should be presented in a format that facilitates readability and reuse.

Where restrictions apply, submissions should be accompanied by a statement of the conditions of access and permitted reuse of the data.


For Review Papers the organisation of the paper can be different. It is however important that a review is more than a summary of the literature; an in-depth critical discussion is essential for acceptance of a review paper.


Article Template

If needed, a template on how to format your paper can be found here


Nomenclature and Units

Please take care that all terminology and notation used will be widely understood. Abbreviations and acronyms should be spelled out in full at their first occurrence in the text. In describing wastewater treatment processes authors should consult Corominas et al. (2010). New framework for standardized notation in wastewater treatment modelling. Water Science & Technology, 61(4), 841-857.

SI units are strongly recommended. If non-SI units must be used, SI equivalents (or conversion factors) must also be given. Please use the spellings 'litre' and 'metre' (a 'meter' is a measuring instrument).

Please use a decimal point rather than a comma in numbers (i.e. 3.142 not 3,142).

Write equations in dimensionless form or in metric units. Please use italic letters to denote variables (in text or in displayed equations). Clearly define all mathematical symbols at first use in the main text.



All figures and tables should be embedded in the text where possible, unless otherwise requested by the publisher.

Figures should appear in numerical order, be described in the body of the text and be positioned close to where they are first cited. Each figure should have a caption which describes the illustration, and that can be understood independently of the main text. The caption should be given in the text, and not on the figure itself.

Make sure all figures and tables will fit inside the text area.

Because figures may be resized in the course of production please use scale bars and not magnification factors.



Please submit tables as editable text and not as images. Number tables consecutively in accordance with their appearance in the text and place any table notes below the table body. Be sparing in the use of tables and ensure that the data presented in them do not duplicate results described elsewhere in the article. Please avoid using vertical rules.



Papers must be in good, grammatically correct English. If your paper cannot be understood, it will be rejected before peer review. If English is not your native language, you should seek the assistance of a colleague or professional translator. IWA Publishing has partnered with Eloquenti to provide you with a 5% discount on peer-to-peer proofreading services. You can use the code IWAPublishing23.


In addition, you should always have your manuscript read by at least two other people to avoid typing errors before submitting to a journal.


Author Attribution

Please note that it is now requested that each submission is accompanied by a full list of author attributions. This can be included as an additional page as part of the submission items. It should be clearly stated how each author contributed to the research/paper. Please note that this is in addition to the co-author email verification policy.



Articles should be provided in electronic form (uploaded to our online submission site here) and comply with the instructions below. There are additional instructions on how to submit a paper through Editorial Manager here.


This journal has no page charges for submission.


Author Attribution

Please note that it is now requested that each submission is accompanied by a full list of author attributions. This can be included as an additional page as part of the submission items. It should be clearly stated how each author contributed to the research/paper. Please note that this is in addition to the co-author email verification policy.



Referencing instructions:

Citations in text:

Use surname of author and year of publication: Jones (2002) or (Jones 2002).

Insert initials only if there are two different authors with the same surname and same year of publication.

Two or more years in parentheses following an author's name are cited in ascending order of year, and two or more references published in the same year by the same author are differentiated by letters a, b, c, etc. For example: Brown (1999, 2002, 2003a, b).

Different references cited together should be in date order, for example: (Smith 1959; Thomson & Jones 2008; Green 2015).

If a paper has been accepted for publication but has not been published the term "(in press)" should be used instead of a date.

If a paper has been submitted but not definitely accepted the term "(submitted)" should be used. If the paper is still being prepared the term "(in preparation)" should be used.

The abbreviation "et al." should be used in the text when there are more than two co-authors of a cited paper.


If you decide to use online referencing software, then you can use the Harvard referencing option.

Please double-check: every citation in the text must match up to an entry in the reference list and vice-versa.


Reference Links

We use digital object identifiers (DOIs) to link references to the source material. This can only be done if the data provided in the references are correct. Please be very careful, especially when copying references, to ensure that surnames, journal/book titles, publication year and pagination are all correct. Please include DOIs where available.


List of References

References should be listed alphabetically at the end of the paper. Although "et al." is preferable in the text, in the list of references all authors should be given.


Journal reference style:

Jie, M. X., Chen, H., Xu, C-Y, Zeng, Q. & Tao, X.E. 2016 A comparative study of different objective functions to improve the flood forecasting accuracy. Hydrology Research, 47(4), 718-735.


Zeng R. J., Lemaire R., Yuan Z. & Keller J. 2004 A novel wastewater treatment process: simultaneous nitrification, denitrification and phosphorus removal. Water Science and Technology, 50(10), 163-170.


Note that to unambiguously identify articles published before 2008 the issue number as well as the volume number is needed.


Book reference styles: (i) article in compilation; (ii) multi-author work; (iii) standard reference; (iv) report; (v) thesis:

(i) McInerney M. J. 1999 Anaerobic metabolism and its regulation. In: Biotechnology, J. Winter (ed.), 2nd edn, Wiley-VCH Verlag, Weinheim, Germany, pp. 455-478.

(ii) Henze M., Harremoës P., LaCour Jansen J. & Arvin E. 1995 Wastewater Treatment: Biological and Chemical Processes. Springer, Heidelberg.

(iii) Standard Methods for the Examination of Water and Wastewater 1998 20th edn, American Public Health Association/American Water Works Association/Water Environment Federation, Washington DC, USA.

(iv) Sobsey M. D. & Pfaender F. K. 2002 Evaluation of the H2S method for Detection of Fecal Contamination of Drinking Water, Report WHO/SDE/WSH/02.08, Water Sanitation and Health Programme, WHO, Geneva, Switzerland.

(v) Bell J. 2002 Treatment of Dye Wastewaters in the Anaerobic Baffled Reactor and Characterisation of the Associated Microbial Populations. PhD thesis, Pollution Research Group, University of Natal, Durban, South Africa.


Online References

These should specify the full URL for the reference and give the date on which it was consulted. Please check again to confirm that the work you are citing is still accessible:

Alcock S. J. & Branston L. 2000 SENSPOL: Sensors for Monitoring Water Pollution from Contaminated Land, Landfills and Sediment. (accessed 22 July 2005)


References in languages other than English

These should be accompanied by an English translation of the article title:

Barjenbruch M., Erler C & Steinke M. 2003 Untersuchungen an Abwasserteichanlagen in Sachsen-Anhalt im Jahr 2003 (Investigation on wastewater lagoons in Saxony-Anhalt in 2003), Report for the Environment Ministry of Saxony-Anhalt, Magdeburg, Germany


Recommendation of new IWA Notation system for wastewater modelling

Hydrology Research encourages its authors to use the IWA Notation System for wastewater modelling by Corominas et al. (2010). To further the widespread use of this notation, IWA Publishing decided to make this paper open access.


The notation was developed by a group of distinguished modelers out of a WWTmod2008 workshop and is supported by the IWA Task Groups on Good Modelling Practice (GMP), Benchmarking of Control Strategies (BSM), and the Water Environment Federation (WEF) Modelling Expert Group of the Americas (MEGA). It has also received a wide endorsement within the modelling community.


The new notation will help the community to assist in model communication, allow for direct model comparisons, and facilitate understanding of newly developed models. The paper by Corominas et al. (2010) aims at standardizing naming rules and provides examples for already published models.


We understand that changing notation is difficult when one has become used to represent concepts in a certain way, but the old notation methods had several shortcomings as a result of the much larger body of knowledge that is now available in comparison to the situation when the original notation was developed (Grau et al., 1987).


The Good Modelling Practice (GMP) Task Group will take on the task to provide assistance with any question that you may have. Please contact the journal office.


Open access link to Corominas et al. (2010) paper:

Corominas, L., Rieger, L., Takács, I., Ekama, G., Hauduc, H., Vanrolleghem, P.A., Oehmen, A., Gernaey, K.V., van Loosdrecht, M.C.M. and Comeau, Y. (2010). New framework for standardized notation in wastewater treatment modelling. Water Science & Technology, 61(4), 841-857.

Grau, P., Sutton, P. M., Henze, M., Elmaleh, S., Grady, C. P. L., Gujer, W. and Koller, J. (1987). Notation for the use in the description of wastewater treatment processes. Water Research, 21(2), 135-139.


Submission Checklist

The following list will be useful during the final checking of an article prior to sending it to the journal for review. Please consult this Instruction for Authors for further details of any item.


Ensure that the following items are present:

One author has been designated as the corresponding author with contact details:

  • E-mail address
  • Full postal address
  • All co-author E-mail addresses for verification
  • A full list of author attributions, defining how each author contributed to the work

All necessary files have been uploaded, and contain:

  • Keywords
  • All figures with captions
  • All tables (including title, description, footnotes)

Further considerations:

  • Manuscript has been 'spell-checked' and 'grammar-checked'
  • References are in the correct format for this journal
  • All references mentioned in the Reference list are cited in the text, and vice versa
  • Permission has been obtained for use of copyrighted material from other sources (including the Internet)
  • A list of 3 independent reviewers


Printed version of figures (if applicable) in black and white

Please supply black and white versions of the figures for printing purposes if necessary


Special Issue Submissions

When submitting a paper for consideration in a Special Issue, please ensure that you select both the correct article type (Special Issue OA) and then also select the correct Special Issue in the article category.


Peer Review Process

All papers that an Editor sends for review will be peer reviewed by a minimum of two independent reviewers. You can see the full process here. More information on how to review a paper can be found here. Instructions on how to submit a review in Editorial Manager are here.



When reviewers are invited to review your manuscript they are given 2 weeks to accept an invitation to review (a reminder is sent after the first week). A considerable number of invitations to review are not accepted because incorrect or out-of-date contact details are provided by authors. This results in further delays to the review process as additional reviewers are then sought, and they too have 2 weeks to respond. To ensure reasonable time frames for review please ensure that you are providing the correct contact details required below.


As part of the submission process you are required to propose five independent reviewers. ‘Independent’ in this process means that they should not be work colleagues or friends. They should have specific expertise in the subject area of the manuscript. At least two should be native English speakers, and since we are an international journal, we would want to see a wide geographic distribution (i.e. not just from your country of origin). For each reviewer please provide:

  • Full name and title
  • Current post or institutional affiliation – web link if possible
  • Work email address (rather than a personal address)
  • Country the reviewer is based in
  • Reason for proposing this Reviewer



Major corrections cannot be undertaken by either the editor or the publishers; if your paper is not prepared in accordance with these instructions it may not be considered further. Where requested to do so in the course of the peer review process, authors must revise their papers within one month of the request; otherwise the contribution will be considered withdrawn.


Changes to Authorship

If you wish to add, delete or rearrange the authors of your accepted paper:

Before online publication: The corresponding author should contact the Journals Manager, and provide (a) the reason for the change, and (b) the written consent of all co-authors, including the authors being added or removed. Please note that your paper will not be published until the changes have been agreed.

After online publication: Any requests to correct an error made with the author names in an article published in an online issue will follow the same policies as noted above and result in a corrigendum. Changes to the author list will not be made for any other reason after publication.


After Acceptance

Use of the Digital Object Identifier

The DOI is a unique set of letters and numbers which can be used to cite and link to your paper online. The DOI is assigned to your paper when the first proof is generated, and it will not change, meaning you can cite an Uncorrected Proof immediately using the DOI.



The corresponding author will be notified via the online system when proofs are ready. Any corrections must be returned within one week of receipt and should only cover typesetting errors. Proofreading is the sole responsibility of the authors.



As soon as the article has been published online, the corresponding author will receive a customized link to the article, which they are encouraged to share via any communication channel, including e-mail and social media. The corresponding author will receive an electronic file of the final version of the article when it has been published in an issue. Additionally, hardcopy offprints can be ordered using the Offprint Order Form, available from IWA Publishing on request.



You should ensure you check your proofs carefully to avoid errors in the final published article. If, however, you notice a scientifically relevant error in the final version of your article, you should contact the journal office to request a correction. Please ensure you include the manuscript reference number of the article. Relevant reasons for correction include:

  • An error in a figure that does not alter the conclusions of the article;
  • An error in data that does not alter the conclusions of the article;
  • Mislabelled figures;
  • An error in the author list (an author has been included or omitted);
  • An error introduced by the publisher during production.

Author name change policy

An author may change their name, for example as a result of religious conversion, gender transition, marriage or divorce, and wish for their publication to reflect the change. IWA Publishing will update the article and send the metadata to secondary indexers. IWA Publishing respects authors’ privacy in this regard and, if appropriate, will not inform the article’s co-authors of the change or publish an Erratum or other note. Authors with a name change request should e-mail the Journal Office, including their list of publications that require a change.

FAQ for Authors

Please see our FAQ page here.


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