Project Example — Illustrative Scenario
Riprap Installation at a Stormwater Drainage Outfall
This is a representative example illustrating the type of work LES performs, not documentation of a specific completed project. Real, photo-documented case studies will replace these examples as current work is completed.
Service Area
Central Florida stormwater outfall
Site Condition
A stormwater pipe outfall discharging into a drainage channel showed signs of scour and soil loss immediately downstream of the pipe.
The Challenge
Concentrated discharge velocity at the outfall was eroding unprotected soil, undercutting the channel bank near the pipe.
The Strategy
- • Graded riprap sized to the outfall's design discharge velocity
- • Filter fabric underlayment to prevent soil migration beneath the rock
Work Performed
Filter fabric was installed beneath the outfall and extending into the channel, with graded riprap placed over it and keyed into the channel bank to prevent flanking.
Value Created
The outfall area stabilized with no further scour observed after subsequent rain events, and the channel bank remained intact.
Risk If Ignored
Continued scour at the outfall would have undercut the channel bank further, eventually threatening the pipe structure itself and requiring a far more expensive structural repair than a properly bedded riprap apron.
Documentation Delivered
Photos of the scoured outfall before work, the filter fabric placement, and the completed graded riprap apron, with a follow-up inspection note confirming no scour after subsequent rain events.
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