CUAs '00, '10, '20 combined

<p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(20, 20, 20); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:medium; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.375; margin:0.5rem 0px 0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Where it is understood that the rule of "once in always in" should be applied in the effort to map VDOT’s MS4 Service Area. And so, the 2000, 2010, and 2020 Census Urbanized Areas (CUAs) were merged in GIS and then dissolved to remove internal crossover boundaries—creating a seamless and uniform boundary.</p><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:&quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:medium; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin-top:1.25rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><div style='align-items:center; border:0px solid currentcolor; box-sizing:border-box; display:flex; flex-wrap:wrap; gap:0.75rem 1rem; margin-bottom:1rem; overflow:hidden;'><br />&nbsp;</div></div>