The project
Sanhedrin 13 is an urban-renewal (pinui-binui) project on a dense urban plot. Like every building permit in Israel since Amendment 8 to national plan TAMA 1, the project required a quantified runoff-management annex - but the site plan left no room for the traditional solutions.
The challenge
In an urban-renewal project every meter of the plot is spoken for: parking basements, utilities, public space. There was no room left for an underground detention tank, and infiltration drilling was not feasible. The hydrologist required real detention - and the conventional solutions simply did not fit on the plot.
The solution
SmartFlow was the only runoff-management solution that fit the plot: detaining rainwater on the roof itself, with a smart valve on every existing drain - no storage layer, no contact with the waterproofing and no underground infrastructure. A pressure-release chamber was added to regulate the discharge into the piping and protect the building's drainage system during controlled release.
Field results
A documented rain event from December 6, 2025 shows the system at work: in a 27 mm event, SmartFlow detained about 2.7 m³ of rain on the roof and released it under control - moderating the discharge that would otherwise have hit the street drainage at peak intensity. Every stage of the event is documented: water level, valve state and forecast context. The full event report is available on the resources page.
- Zero underground infrastructure - no tanks, no drilling
- Full compliance with the hydrologist's requirement through on-roof detention
- Pressure-release chamber protects the piping on every release
- Every rain event documented in a measured-data report