Energy Dissipator Calculator

Design stilling basins, impact basins, and energy dissipation structures using FHWA HEC-14 and USBR methodology. Calculate basin dimensions, sequent depth, and energy dissipation.

USBR Stilling Basin Selection

TypeFroudeL/y2
Type I< 2.54
Type II> 4.5 (high V)4.3
Type III4.5 - 172.8
Type IV2.5 - 4.56

Type VI Impact Basin Limits

Maximum Discharge 400 cfs
Maximum Velocity 50 ft/s
Length/Width Ratio 1.33
Depth/Width Ratio 0.5

Impact basins are effective for small discharges and high velocities where space is limited.

Input Parameters

Dissipator Selection

Compact basin with chute blocks, baffle blocks, and end sill

Flow Parameters

cfs
ft/s
ft

Flow depth or pipe diameter

ft

For box culverts/channels

ft

Calculated if not provided

Drop Structure (optional)

ft

Vertical drop at basin entrance

Ready to Design

Select a dissipator type and enter flow parameters to design the basin.

For educational purposes only. Not a substitute for professional engineering judgment.

Powered by DrainageCalculators.com — free drainage & stormwater calculators