How to stop water dripping in to my polytunnel?

Morning all,

I believe that due to strong winds it seems it is slowly ripping apart the fabric of the polytunnel where they are joined by the stitching.

I was wondering what I can do to help stop the situation getting worse?

Was thinking of getting several pieces of rope and chuck it over the tunnel anchoring at both sides which should help stop the fabric from blowing about in the wind.

Anyone else had a similar problem?

Samuel