How Is Commercial Site Civil Design Done in Flat Caliche Country?

The grading plan is where drainage is won or lost. The engineer sets finish-floor elevations above the adjacent grade with freeboard for the design storm, slopes pavement at minimums the contractor can actually build, typically around one to two percent, and eliminates birdbaths by checking the grading model for trapped low points. On caliche, cutting is slow and fill must be placed in controlled lifts, so the earthwork plan balances the site to minimize import while achieving the drainage slopes. Proof rolling and density testing verify the subgrade before pavement or slab goes down. Erosion and sediment control run through construction. Even flat sites generate sediment when West Texas winds and cloudbursts hit exposed caliche, so the stormwater pollution prevention plan includes perimeter controls, stabilized construction entrances, and phasing that limits the disturbed area. The controls stay until the site is stabilized with pavement or vegetation, and the contractor maintains them as a permit condition, not an option.

Detention design answers the question every downstream neighbor asks: where does the water go. The engineer models pre- and post-development runoff for the design storms, sizes detention to hold the increase, and designs outlet structures that release it at or below pre-development rates. Where playa lakes sit nearby, the design keeps development and its runoff out of the playa rim and documents that the project does not push water into the closed basin. Overflow routes are graded for storms beyond the design event, because the basin's cloudbursts do not read the design manual. Pavement sections are engineered for the loads they will actually carry. An oilfield commercial site sees loaded trucks that punish thin pavement, so the section is designed from subgrade test values with concrete thickness and jointing to match. Access design starts early: driveway locations are checked against city or TxDOT spacing and sight-distance rules, throat depths keep entering trucks from backing into the street, and fire lanes meet width and turning-radius requirements. The civil set ties grading, drainage, paving, utilities, and access into one coordinated plan that the AHJ can review as a whole.