Finding design basis
Collecting flow, water quality and project requirements.
Engineering Calculation System
Engineering calculations shouldn’t start from scratch every time.
AIDIA helps engineers perform common water and wastewater design calculations through structured Excel modules with transparent formulas, engineering criteria, automated checks, and review-ready outputs.
Transparent Formulas
Design Criteria
Built-in Checks
Review-Ready Outputs
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AIDIA
Inline Static Mixer Design Calculation
Design Basis
| Parameter | Value | Unit |
|---|---|---|
| Design flow rate | 50 | m³/h |
| Water temperature | 5.0 | °C |
| COV target | 10.0 | % |
| Mixer efficiency | 1.00 | — |
Design Criteria
| Criterion | Lower | Upper |
|---|---|---|
| Mixing time | 1.0 | 3.0 s |
| Gt value | 350 | 1700 |
| Reynolds no. | 5000 | — |
| Hmax | — | 0.9 m |
Standard-Diameter Screening
| Diameter | ΔP / element | Headloss | Mixing time | Reynolds No. | Status |
|---|---|---|---|---|---|
| 150 mm | 0.899 kPa | 0.275 m | 0.86 s | 78,532 | CHECK |
| 200 mm | 0.284 kPa | 0.087 m | 2.04 s | 58,899 | PASS |
| 250 mm | 0.117 kPa | 0.036 m | 3.98 s | 47,119 | CHECK |
Transparent calculation flow
Built-in design checks
Review-ready structure
READ MECOVERCALCULATIONDASHBOARDDESIGN CRITERIAABBREVIATIONS
The calculation is often not the hardest part.
Much of an engineer’s time is spent around the calculation — finding references, tracing formulas, checking criteria, and keeping workbooks consistent.
Searching criteria
Looking through references and design guidelines.
Rebuilding old sheets
Copying and modifying previous project workbooks.
Tracing formulas
Understanding how outputs were actually calculated.
Reviewing inconsistent workbooks
Different formats and logic across projects.
Repeating manual checks
Rechecking calculations and criteria every time.
Built from the kind of spreadsheets we wished we had.
Engineering spreadsheets often grow from old project files, textbook equations and repeated revisions. They work, but over time they can become difficult to trace, standardize and share.
AIDIA was created to turn that scattered engineering knowledge into a more structured workflow — with consistent layouts, clear formulas, built-in criteria checks, and outputs that are easier to review and reuse.
Textbook equations
Core equations and standard design methods.
Project experience
Practical engineering judgement from real work.
Design criteria
Target ranges, checks, and acceptance limits.
→
AIDIA structured workflow
InputCalculationCriteriaChecksOutput
Design Inputs
Transparent Calculation
Q / SOR → Area
Headloss → Check
Design Checks
PASSCHECK
Review-Ready Output
Structured tablesConsistent layoutReusable workflow
A more structured and consistent engineering workflow.
How AIDIA Works
A structured workflow from input to engineering output.
1
Design Input
Enter project data and design parameters.
2
Engineering Calculation
Apply transparent formulas.
3
Design Criteria
Check against relevant standards.
4
Design Check
Automatic checks and flagging.
5
Equipment Sizing
Calculate and size key equipment.
6
Engineering Output
Generate review-ready outputs.
Inside Every AIDIA Module
A consistent structure across every calculation.
READ MEOverview, scope, assumptions and user instructions.
COVERProject information, revision history and general notes.
CALCULATIONMain calculation sheet with inputs, formulas and results.
DASHBOARDSummary of key results, charts and design highlights.
DESIGN CRITERIAApplicable design criteria and references.
ABBREVIATIONSCommon symbols and abbreviations used in the module.
Designed for Engineering Review
A calculation should be understandable by the next engineer who opens it.
| Description | Symbol | Formula | Unit | Notes |
|---|---|---|---|---|
| Design flow rate | Q | Input | m³/d | From project data |
| Surface overflow rate | SOR | Input | m³/m²·d | Typical range: 20–40 |
| Required surface area | A | A = Q / SOR | m² | Per basin |
| Basin diameter | D | D = √(4A/π) | m | Circular basin |
| Side water depth | h | Input | m | Typical range: 2.5–4.0 |
| Detention time | t | t = (A × h) / Q | hr | Hydraulic retention time |
| Weir length | Lw | Lw = π × D | m | Per basin |
No Black Box
Know how the result was calculated.
Formula Trace Example: Surface Area Calculation
Inputs
Q = 10,000 m³/d
SOR = 30 m³/m²·d
SOR = 30 m³/m²·d
→
Formula
A = Q / SOR
10,000 / 30
→
Output
333.3 m²
Required surface area
- ✓ Inputs remain visible
- ✓ Formulas remain traceable
- ✓ Design criteria are identified
- ✓ Results remain reviewable
⚖ AIDIA supports engineering judgement — it does not replace it.
Built-in Design Checks
Not just calculated. Checked.
| Parameter | Result | Criteria | Status | Notes |
|---|---|---|---|---|
| Surface overflow rate (SOR) | 30 m³/m²·d | ≤ 40 m³/m²·d | PASS | Within typical range |
| Detention time (HRT) | 2.4 hr | 1.5–4.0 hr | PASS | Within typical range |
| Side water depth | 3.0 m | 2.5–4.0 m | PASS | OK |
| Weir loading rate | 218 m³/m·d | ≤ 250 m³/m·d | PASS | OK |
| Sludge storage volume | 120 m³ | ≥ 100 m³ | PASS | OK |
| Freeboard | 0.3 m | ≥ 0.3 m | PASS | Minimum recommended |
| Diameter to depth ratio | 4.9 | 3–5 | REVIEW | Confirm against project-specific criteria |
Calculation Library
Modular tools for water and wastewater design.
Chemical Treatment & Mixing
- Inline Static MixerView Module →
- Coagulation Rapid Mix TankView Module →
- Baffled FlocculatorView Module →
- Vertical Turbine FlocculatorView Module →
- Lime SofteningIn Development
- Neutralizer ReactorIn Development
Separation & Sludge Treatment
- Horizontal-Flow Sedimentation BasinView Module →
- Circular Sedimentation BasinView Module →
- Gravity ThickenerIn Development
- Dissolved Air FlotationIn Development
- Sludge StorageIn Development
- Belt Filter PressIn Development
- CPI SeparatorIn Development
Biological Treatment
- Activated SludgeIn Development
- Extended AerationIn Development
- UASBIn Development
- Anaerobic FilterIn Development
- MBBRIn Development
- Odor Control BiofilterIn Development
Filtration & Advanced Treatment
- Pressure Sand FilterIn Development
- Fixed Bed ColumnIn Development
- SoftenerIn Development
- Ion ExchangeIn Development
- Granular Activated CarbonIn Development
- Packed Gas Stripping TowerIn Development
Utilities & Disinfection
- Cooling TowerIn Development
- DeaeratorIn Development
- Chlorine DemandIn Development
- UV DisinfectionIn Development
Process Selection & Engineering Tools
- Treatment Process DeterminationIn Development
- WWTP EvaluationIn Development
- Cycle AnalysisIn Development
Engineering Resources
Useful engineering references and guides.
Understanding Surface Overflow Rate
Principles, calculations, and design considerations for sedimentation basins.
Read more →Gravity Thickener Design Criteria
Design principles, evaluation stages, and engineering considerations for gravity thickener selection.
Read more →How to Select Flocculation G-Value
Mixing intensity, floc development, tapered staging, and practical selection considerations.
Read more →Hydraulic Retention Time Explained
Residence time, effective tank volume, hydraulic distribution, and practical design considerations.
Read more →Where AIDIA fits in your work.
Process Engineer
Design and evaluate treatment processes.
Consultant
Prepare calculations for client projects.
Freelancer
Deliver consistent, professional workbooks.
Junior Engineer
Learn and apply standard methods.
Engineering Team
Standardize calculations across projects.
AIDIA helps with
- Structured calculations
- Equipment sizing
- Criteria checking
- Documentation
- Repeatable workflows
AIDIA does not replace
- Engineering judgement
- Project-specific decisions
- Regulatory review
- Vendor confirmation
- Professional approval
A Growing Engineering System
From calculation modules to engineering system.
▤Design Basis
◫Mass Balance
⚙Process Design
▦Equipment Calculation
▤Process Datasheet
▣Engineering Report
AIDIA is being developed as a modular engineering ecosystem, with calculation modules as the foundation for a more complete set of engineering tools.
Frequently Asked Questions
Key questions about how AIDIA modules are intended to be used.
Yes. AIDIA is designed to keep engineering logic visible and easier to review, rather than hiding how results are obtained.
Each module can include design criteria, basis notes, references, and the calculation framework relevant to that module.
The final published support note can be adjusted to match the Microsoft Excel desktop versions you decide to support.
That depends on the license policy you publish for the module, but the website structure is ready for commercial-use product pages.
No. AIDIA supports structured engineering calculations, but final design still requires project-specific judgement and professional review.