Journal profile · Multiple
Blue-Green Systems
ISSN 2617-4782 · IWA Publishing · United Kingdom
Blue-Green Systems: CAS Zone 4 · Environmental Science & Ecology (2025 upgraded edition); impact factor 3.2 (journal website); fully open access; APC about USD 2,940; review about 23 weeks (community reports); 35 articles in 2025; indexed in ESCI and Scopus.
Scope
Aims, scope and focus
Blue-Green Systems is published by IWA Publishing and is in Zone 4 of Environmental Science & Ecology in the CAS Journal Ranking (2025 upgraded edition). By OpenAlex counts of its recent articles, its largest topics are Urban Stormwater Management Solutions, Flood Risk Assessment and Management and Urban Heat Island Mitigation, together about 48.1% of its articles. (generated from OpenAlex topic counts and CAS ranking data)
Blue-Green Systems brings together cutting edge research on sustainable, energy efficient and environmentally responsible water use in cities and their regions, including innovative approaches such as Sponge Cities, Low Impact Development, Nature Based Solutions and Water Sensitive Urban Design. It welcomes contributions from water engineers, economists, planners, hydrologists, ecologists, sociologists, architects, landscape designers, health workers, policymakers and anyone else engaged in solving the water challenges of a rapidly urbanizing planet. Work at city, watershed, basin and region level is all of interest.
From the journal's Aims & Scope
Research area (LetPub): Multiple
Editor-in-chief Gang LiuPublisher website
Main research topics OpenAlex counts of recent articles; shares are approximate
- Urban Stormwater Management SolutionsEnvironmental Science24.2%
- Flood Risk Assessment and ManagementEnvironmental Science12.4%
- Urban Heat Island MitigationEnvironmental Science11.5%
- Land Use and Ecosystem ServicesEnvironmental Science8%
- Urban Green Space and HealthEnvironmental Science6.5%
- Hydrology and Watershed Management StudiesEnvironmental Science5.9%
- Constructed Wetlands for Wastewater TreatmentEnvironmental Science5.3%
- Wastewater Treatment and ReuseEnvironmental Science4.7%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Environmental Science & Ecology Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Environmental Science & Ecology | Zone 4 |
| Minor | Environmental Sciences | Zone 4 |
| Minor | Water Resources | Zone 4 |
Top journal: noReview journal: no
CAS Xinrui Journal Ranking (March 2026)Environmental Science & Ecology Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Environmental Science & Ecology | Zone 4 |
| Minor | Environmental Sciences | Zone 4 |
| Minor | Water Resources | Zone 4 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Not covered
Not covered by this edition.
Database indexing
ESCIScopusDOAJLetPub
International journal early-warning lists: not listed in any editionLetPub
Indexing the journal's website claims
Web of SciencePublisher website
As the journal's website lists them, not checked against each database; for Web of Science editions the records above apply.
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor (publisher)
- 3.2Publisher website ·
- CiteScore 2026-06
- 4.7LetPub ·
- SJR 2026-06
- 0.8LetPub ·
- SNIP 2026-06
- 0.98LetPub ·
- h-index
- 24OpenAlex ·
- i10-index
- 54OpenAlex ·
- 2-year mean citedness
- 3.09OpenAlex ·
- Self-citation rate
- 18.8%LetPub ·
- Share of gold OA articles
- 100%LetPub ·
Volume
- Articles per year
- 32LetPub ·
Articles by year OpenAlex count · 175 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 22 | 22 | 4 |
| 2025 | 35 | 35 | 73 |
| 2024 | 24 | 24 | 173 |
| 2023 | 22 | 22 | 205 |
| 2022 | 21 | 21 | 367 |
| 2021 | 20 | 20 | 427 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Review & acceptance
Review time and acceptance
- Average review time (community reports)
- about 23 weeksLetPub ·
- Submission to publication (journal-reported)
- about 19 weeksDOAJ ·
- Peer review
- Single anonymous peer reviewDOAJ
Community reports come from authors' own submissions (confidence 0.5) and are not a promise from the journal; for publisher figures, the journal's own definitions apply.
Fees & open access
APC and open-access policy
Fully open accessDOAJ
Every article is open access; authors usually pay an article processing charge (APC).
| Source | APC | Fee waiver | License | Observed |
|---|---|---|---|---|
| DOAJ | USD 2,940 / GBP 2,205 / EUR 2,528 | Yes | CC BY, CC BY-ND, CC BY-NC | |
| LetPub | EUR 2,075 / GBP 1,850 / USD 2,250 | Yes | — | |
| Publisher website | Yes, amount not published | — | — |
Other charges and waivers (author guidelines)
- Submission fee
- Charged; see the journal's website for the amount
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Submission
Article types and submission policies (journal website)
What to prepare5 items from the author guidelines
- Manuscript length
- ≤ 8,000 words
- Reference style
- Harvard
- Templates
- Word
- First submission
- Free format: the journal's layout is not required
- Cover letter
- Required
Article types accepted1
- editorialSpecific article types available in each journal are listed in Editorial Manager at the point of submission.Length not stated
Policy excerpts from the journal's websiteAuthorship, Publication ethics
- Authorship Author Contributions
As outlined in IWA Publishing’s Ethical Guidance (iwaponline.com/pages/Ethical_Guidance), to increase transparency, IWA Publishing encourages authors to include a full list of author contributions in their manuscripts. 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 i…
Source ↗Publisher website ·- Publication ethics
COPE member Model summary
IWA Publishing is a member of the Committee on Publication Ethics (COPE).
Source ↗Publisher website ·
Excerpts are quoted from the journal's website; "model summary" lines are written by Workers AI and checked against the text. The journal's website is authoritative.
Profile
Publication details and official links
- Publisher
- IWA Publishing
- Country or region
- United Kingdom
- Language
- English
- ISSN
- 2617-4782
- Society / sponsor
- International Water Association
- Latest issue on the website
- Volume 8, Issue 2 (December 2026)
- Official links
- Journal homepage ↗LetPub
- Submission system ↗Publisher website
- Author guidelines ↗DOAJ
- Aims & Scope ↗LetPub
- Special issues ↗Publisher website
- APC information ↗DOAJ
- Fee waivers ↗DOAJ
- Open access statement ↗DOAJ
- License & copyright ↗DOAJ
- Peer review process ↗LetPub
- Editorial board ↗LetPub
- Plagiarism policy ↗DOAJ
FAQ
Frequently asked questions about Blue-Green Systems
What CAS zone is Blue-Green Systems in?
In the 2025 upgraded edition of the CAS Journal Ranking, Blue-Green Systems is in Zone 4 of Environmental Science & Ecology, and in Zone 4 of the minor category Environmental Sciences / Water Resources. In the 2026 Xinrui edition it is in Zone 4 of Environmental Science & Ecology. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of Blue-Green Systems?
The journal's website gives an impact factor of 3.2; this is the journal's own figure, as LetPub lists none for it; CiteScore 4.7, h-index 24.
How long does peer review take at Blue-Green Systems?
Authors report an average review time of about 23 weeks. Article statistics cover accepted papers only, publisher figures follow the journal's own definitions, and community reports come from authors' own submissions; none is a promise from the journal.
What are the manuscript requirements of Blue-Green Systems?
According to the journal's author guidelines: Manuscript length: ≤ 8,000 words; Reference style: Harvard; Templates: Word; First submission: Free format: the journal's layout is not required; Cover letter: Required. A model extracted these from the author guidelines and each was checked against the text; check the latest version on the journal's website before submitting.
Which databases index Blue-Green Systems?
According to LetPub and DOAJ records, Blue-Green Systems is indexed in ESCI, Scopus and DOAJ. The journal's website also lists Web of Science; that list has not been checked against each database.
Is Blue-Green Systems open access, and what is the APC?
Blue-Green Systems is a fully open-access journal. APC about USD 2,940.
Sources and updates
The facts on this page come from LetPub, DOAJ, OpenAlex, Publisher website; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-26). Last updated: .