Trades & Professional Tools · Site Work & Landscaping
Rain-Garden Storage Volume Worksheet
Compare entered surface, soil and optional gravel storage with a visitor-entered design runoff volume.
Trades & Professional Tools · Site Work & Landscaping
Enter your project measurements
Measured inputs · visitor-entered product and design assumptions
1EnterProvide the known values
2CalculateResults update automatically
3VerifyReview the details and units
Try an example
Measure using one consistent system. Product coverage, density, resistance, waste, and safety assumptions must come from the actual product data or project specification. Values stay in this browser.
Trade calculator result
Enter valid values to see the result.
Your entries are calculated in this browser and are not submitted to 365CALCS.COM.
Follow the calculation from field input to decision
1Define catchment and event→
2Route flow or storage→
3Check outlet and field limits
Each stage is deliberately separate: verify the source values, the calculation basis, and the final field or shop check.
Rain-garden plan area (m² or ft²)Surface ponding depth (mm or in)Soil storage depth (mm or in)Entered drainable soil void (0–100%)Gravel storage depth (mm or in)
The relationship
Read the formula before using the result
Storage=surface ponding plus each included layer area×depth×entered drainable void fraction; margin=storage−design runoff.
The calculator preserves full internal precision. Confirm that every entry uses the same measurement condition, unit basis, product or machine data, and scope represented by this formula.
Professional check
Turn the answer into a responsible next step
1. Verify the inputs
Use actual measurements, current drawings, approved specifications, and manufacturer or process data for the real job.
2. Challenge the assumptions
Check allowances, losses, stock or package rounding, operating condition, and whether the result matches an independent measurement or estimate.
3. Respect the boundary
It does not establish boundaries, legal grades, utilities, excavation safety, drainage approval, irrigation criteria, structural design, chemical application, permits, or environmental compliance.
Quick guide
How to use this calculator
Choose the calculation mode or measurement system that matches the values you actually have.
Enter measured project dimensions and use product-specific coverage, density, yield, resistance, or waste data where requested.
Review the intermediate results before ordering material or applying the result on site.
Calculation method
Calculation method
Storage=surface ponding plus each included layer area×depth×entered drainable void fraction; margin=storage−design runoff.
The calculator preserves full internal precision and rounds only displayed results. Quantity outputs round up when whole purchasable pieces are required.
Worked example
Worked example
Twenty m² with 150 mm surface storage provides 3 m³ before optional soil/gravel storage.
Storage=surface ponding plus each included layer area×depth×entered drainable void fraction; margin=storage−design runoff.
Supported inputs
Precision and limits
Site, water and landscape-design boundary
These tools use measured site geometry, field observations, product data, approved application rates, locally selected rainfall and runoff inputs, and contractor production assumptions you enter. They do not establish legal grades or boundaries; prescribe fertilizer, irrigation, drainage, planting, soil, pesticide or structural criteria; locate utilities; approve excavation or equipment operation; or replace drawings, permits, local environmental rules and qualified professional review.
Planning scope
This calculator supports measurement, estimating, and scenario planning. It does not inspect a site, select a product, certify a design, or replace drawings, specifications, manufacturer instructions, local codes, permits, or a qualified trade professional.
Measured and product-specific inputs
Nominal dimensions can differ from actual dimensions. Verify inside pipe diameters, actual lumber sizes, product coverage, bag yield, material density, conductor resistance, waste, and packaging against the materials used on the project.
Safety and regulatory limits
Electrical, HVAC, structural, excavation, roofing, pressure, lifting, and life-safety work may require jurisdiction-specific calculations and professional approval. Do not use a generic planning result as a code-compliance or safety determination.
Precision and privacy
Inputs accept bounded plain decimals. Calculations remain in this browser and raw entered project values are not submitted to 365CALCS.COM.
