How can I stop water from flowing back into my Honda WB30 Water Pump 1100 LPM 80mm Outlet when the heavy duty hose attached gets blocked?

I have a 1000l take of water attached to a Honda WB30 Water Pump 1100 LPM 80mm Outlet, alongside a heavy duty hose I use to water window boxes around London. When I park up the van and have to cross the road to water certain jobs, the pipe is occasionally temporarily blocked when a car runs over the hose pipe. This sends water back to the pump, and eventually breaks it. What can I do to stop the water/ pressure breaking the pump?

A check valve, either a disc or ball type would prevent that. However, that would localize the pressure to the hose and may rupture the hoses. And how does the pump break? Rupture a seal? Heat up from dead heading the pump? Stopping the flow back might not be the entire answer. A centrifugal pump like this should be constructed to handle the maximum pressure the pump can produce, unless you let it run with no flow for a long time and it heats up. If that is the case, stopping the back flow is not the problem.