Site calculation sheet (free)
- Item and purpose
- Inputs and sources
- Design storm and rainfall depth
- Formula used
- Result and units
- Limits and checks
Contractors, designers and homeowners sizing site work
What are you sizing?
Free site calculators with a printable sheet: pipe velocity and flow, rainwater harvesting, riprap and earthwork, using your site's rainfall.
- Free to read
- No sign-up until the draft
- Hands off to the right door
ePlan fills in
- Rainfall depths
- Drainage area
- Slope
- Soil type
How it works
Site calculation sheet, from one answer
- Pick what you're sizing and enter the site.
- ePlan fills in rainfall, drainage area and slope, then runs the calculation.
- Print the sheet free. Grading the site? Start a grading and dust control plan.
What you get
Site calculation sheet and 1 more document
The check is free. The paperwork after it is drafted at the Grading and erosion control plan door.
Grading and dust control plan
- Disturbed area and cut and fill
- Erosion and sediment controls
- Dust control measures
- Schedule and inspections
From public data
What ePlan fills in, and from where
- Rainfall depths by stormNOAA Atlas 14 (PFDS)
- Drainage area and flowsUSGS StreamStats
- SlopeUSGS 3D Elevation Program
- Soil hydrologic groupUSDA NRCS Web Soil Survey (SSURGO)
1%
chance of being exceeded in any given year is what a '100-year' design storm means, not a storm that comes once a century
Source: NOAA Hydrometeorological Design Studies Center FAQ
Ready for the paperwork?
Draft the erosion and sediment control plan, grading narrative and dust control plan your city or county wants with the grading permit. Free to read.
Questions
Site Calculators: what people ask
Where do design rainfall depths come from?
NOAA's Precipitation Frequency Data Server delivers NOAA Atlas 14 precipitation frequency estimates: pick a state and a point and it returns rainfall depths for each storm duration and frequency.
What does a 100-year storm mean?
It is the rainfall amount that is exceeded on average once every 100 years, which means a 1 percent chance of being exceeded in any given year. The 100 years is an average, not a schedule.
When does site work need a stormwater permit?
Federal rules cover clearing, grading and excavating that disturb one acre or more, including smaller lots that are part of a larger plan of development that will disturb an acre or more.
The rules this door follows
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Site Calculators: check it free
Answer it and ePlan opens the Grading and erosion control plan door, which drafts the paperwork.