CREATE TABLE table_name_6 (design_flow__lpm_ INTEGER, population_served VARCHAR(255), partner VARCHAR(255), construction_start VARCHAR(255))
What is the total Design flow (LPM) with a Partner of app, a Construction Start of 2008 january, and a Population Served larger than 3500?
    
SQL: SELECT SUM(design_flow__lpm_) FROM table_name_6 WHERE partner = "app" AND construction_start = "2008 january" AND population_served > 3500