Crown Water design and manufacture vortex flow controls for the regulation of storm flows in both surface water drainage and foul sewers. Welcome To Crown Water Crown Water design and manufacture vortex flow controls for the regulation of storm flows in both surface water drainage and foul sewers. Storm Water Control We offer a full range of flow controls to meet every application. Each unit is individually designed and built to meet your precise requirements. Individually designed and built to order. Self activating. No moving parts to wear or replace. No power supply required. Robust stainless steel construction. Fast delivery. Design Each Vortex Flow Control is individually designed to deliver optimum performance and to ensure ease of installation. Our technical staff will be pleased to discuss your requirements and to specify a suitable flow control unit. Full performance and installation details are provided for each unit specified. Manufacturing By using modern production methods we are able to offer a well engineered, tailor made product quickly and at an extremely competitive price.