Red flags are design elements that are commonly or easily overlooked and may need extra attention when designing. Considering the red flags upfront will expedite the design and fabrication process, and eliminate delays, installation, and performance issues.

Where are you buying structural backfill these days? Is what you need readily available, or are you looking outside your area and/or waiting an extended time for delivery? With available land space continuing to decrease, stormwater detention/retention is commonly being designed underground. The current construction boom and increasing detention volume requirements have made rock scarce and expensive in many parts of the country.

It’s never surprising to see some type of fabric or geotextile called-out around an underground detention or infiltration system. The note is common across