Stormwater is shifting from a permitting hurdle to a design driver. Impervious-area fees, volume-retention requirements, and water-quality rules now routinely decide surface-lot layouts: where the islands go, what the pavement is, how big the project can be. The owner who treats them as an afterthought pays for the privilege annually, because stormwater fees bill on impervious square footage forever.
On surface lots the toolkit is mature: permeable pavements where soils and loads allow, bio-retention in the islands the landscape plan wanted anyway, and drainage that moves water to where it can infiltrate rather than to where it can pond. Each permeable square foot typically reduces the fee base as well as the runoff, which converts a compliance cost into a return calculation. In structures, water management is the waterproofing system's operating partner: drains and trench grates cleaned on schedule, oil-water separators and sand filters maintained at least annually, and wash-down water -- the chapter's own recommendation in section 7.1 -- routed and treated as the discharge it legally is.
The design habit that pays is to route the water on purpose. Every gallon that leaves a parking facility goes somewhere, and the difference between a fee, a violation, and a credit is usually nothing more than whether anyone decided where.
meet the stormwater obligation as a design input, not a permit surprise -- and mine it for the opportunity: detention that doubles as landscape, credits where the jurisdiction sells them, and a site that drains because it was drawn to.
From the shelf
- Module 19: surface lot layoutdrainage drawn into the plan
- Module 57: water is the enemythe same enemy, inside the structure
Source crosswalk -- where each section came from in the manuscript
| Module section | Source: Chapter 7, Sustainability & EV |
|---|---|
| Water: Stormwater as Obligation and Opportunity | Section 7.5 |