Question: What are the Juntas de Regantes (WUB) within the Azua Valley?
SQL: SELECT "Juntas de Regantes (WUB)" FROM "1-20018310-1" WHERE "Irrigation District" = 'Azua Valley';

Question: Which irrigation district has 4733 users?
SQL: SELECT "Irrigation District" FROM "1-20018310-1" WHERE "Users (#)" = 4733.0;

Question: What's the number of users in the Nisibon-Yuma within the Del Este district?
SQL: SELECT "Users (#)" FROM "1-20018310-1" WHERE "Irrigation District" = 'Del Este' AND "Juntas de Regantes (WUB)" = 'Nisibon-Yuma';