Just over 75 percent of impacted property owners cast votes to impose an assessment to leverage $473 million in enhanced flood protection for southwest Manteca, Lathrop, and the Weston Ranch area of Stockton. The unofficial count of weight ballots — every dollar in assessed value equating one vote — was completed Friday after the mail-in ballot election ended during a San Joaquin Area Flood Control Agency (SJAFCA) hearing conducted Thursday at Lathrop City Hall.