Why We Named the App Rapid RUSLE

If you've ever calculated CGP risk by hand, you already know:

The most complex part of the equation isn't receiving water or combined risk.

It's sediment risk, which is calculated using RUSLE.

RUSLE — the Revised Universal Soil Loss Equation — is the equation used to determine sediment risk under the Construction General Permit (CGP). And sediment risk is the foundation of the entire project risk determination.

Under the CGP, risk is calculated in three steps:

1. Sediment risk is calculated using RUSLE
2. Receiving water risk is calculated
3. The two are combined to determine the final Risk Level/Type, which is used when filing the Notice of Intent and obtaining a WDID in SMARTS

The combined risk level is what gets reported.

But sediment risk is where the real complexity lives.

That's why we named the app Rapid RUSLE.

The Crux of Risk Calculation

On paper, RUSLE seems straightforward. It uses familiar factors:

• R (rainfall erosivity)
• K (soil erodibility)
• LS (length-slope and steepness)

In practice, those inputs are rarely simple.

Projects can straddle multiple soil types and slope conditions, requiring careful application of different K and LS factors across the site. Disturbance may be phased. Slopes and soil types vary.

Small input errors can meaningfully change the sediment risk calculation — and potentially shift the project's overall risk level/type.

Even experienced SWPPP developers make mistakes here because the variables are dynamic, and the timelines to submit SWPPPs and obtain WDIDs can be tight.

When Schedules Shift, Risk Shifts

Project dates are rarely fixed.

Start dates move. Grading phases adjust. Rainy season exposure changes. Owners accelerate or delay work.

Every change affects the rainfall exposure window — and therefore the sediment risk calculation and overall project risk.

And when dischargers are trying to maintain a lower risk level, precision matters. Overestimate exposure and you may unnecessarily increase risk. Underestimate it and you risk compliance issues.

Sediment risk isn't just one step in the process.

It's the crux of the process.

Why We Made Rapid RUSLE

We built Rapid RUSLE because this is where SWPPP developers can spend too much time when developing a SWPPP — and where errors most often occur.

Rapid RUSLE:

• Calculates sediment risk accurately using RUSLE
• Handles multiple LS and K factors seamlessly
• Instantly adjusts when project schedules change
• Calculates receiving water risk and final combined risk
• Generates a clean, professional PDF ready for the risk section of your SWPPP

No spreadsheet gymnastics.
No repetitive recalculations.
No second-guessing when timelines shift.

Why “Rapid” Matters

Because in the real world:

• Schedules change weekly.
• Clients ask for updated SWPPPs.
• Plans evolve.
• Deadlines loom.

Rapid RUSLE recalculates full project risk in minutes — not hours — and produces a slick, ready-to-insert PDF that documents your methodology clearly and professionally.

It removes friction from one of the most technically complex parts of SWPPP development.

Built for Experienced SWPPP Developers

It was built for experienced SWPPP developers who understand:

• How nuanced sediment risk really is
• How easy it is to make small but impactful errors
• How painful it is to redo calculations when dates shift
• How critical defensible documentation is

We didn't simplify the science.

We simplified the process.