user: Question: 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?
Columns: ['Location', 'Partner', 'Construction Start', 'Inauguration Date', 'Population Served', 'Design flow (LPM)']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Ojojona, HON', 'APP', '2006 June', '2007 July', 2000.0, 375.0]
SQL:

assistant: SELECT SUM("Design flow (LPM)") FROM "Table" WHERE "Partner" = 'app' AND "Construction Start" = '2008 january' AND "Population Served" > 3500.0;