Vancouver Sun – The City of Richmond has received an unexpected $5-million windfall from River Rock Casino, which continued its winning streak last year as B.C.’s top gambling and entertainment destination. Richmond had budgeted to receive $12.4 million in gambling revenue last year, but instead took in a record $17.6 million — up 13.1 per cent over 2012. Casinos are required to give cities in which they operate 10 per cent of net gambling revenue. River Rock has consistently paid out more to local municipalities than any other casino in B.C. Since 1999, Richmond has received $136.7 million in gambling…