By Jacob Leeks Manchester United have been left embarrassed after the away dressing room at Old Trafford flooded following their defeat to Arsenal. Heavy rain struck Manchester towards the end of Sunday’s Premier League clash. United said that 1.6 inches of rain fell in the two hours after the final whisttle, more than in the entire month of May 2023. That rain saw a long-running problem re-emerge, with water cascading from one corner of the ground and floods pouring under the seats. Old Trafford has been hit by chronic under-investment since the Glazers bought the club in 2005. New controllin…