// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
eng.unit-hydrograph-SCS Calculator
Calculates direct runoff depth from rainfall using the SCS Curve Number method and derives the unit hydrograph peak discharge. SCS Curve Numbers range from 30 (open space, poor condition) to 98 (impervious surfaces) — CN drives runoff estimates for stormwater design.
Inputs
Curve Number
Count of items or occurrences.
Rainfall Mm
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Catchment Area Km2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
direct runoff Q (mm)
Sample size or count used in the calculation.
runoff volume (m³)
The computed three-dimensional volume.
potential max retention S (mm)
Sample size or count used in the calculation.
initial abstraction Ia (mm)
Sample size or count used in the calculation.
Q = (P-0.2S)²/(P-0.2S+S)
Reference formula or conversion factor shown for context.