how many latitudes have 0.081 (sqmi) of water?
CREATE TABLE "o" (
  "township" text,
  "county" text,
  "pop_2010" real,
  "land_sqmi" text,
  "water_sqmi" text,
  "latitude" text,
  "longitude" text,
  "geo_id" real,
  "ansi_code" real
);
SELECT COUNT("latitude") FROM "o" WHERE "water_sqmi"='0.081';