El Salvador continues under an "orange alert" as a weather system, indirectly caused by Hurricane Rita continues to drop rain in the country. Much of the flooding has been in low-lying areas of San Salvador. The problems stem from an inadequate system to carry away rain water, and trash which clogs drains in the streets. As a result, some streets become surging rivers.
Mudslides have killed three people in the country in the past few days. 490 persons were evacuated from homes in areas at highest risk. The most effected areas are San Salvador and La Libertad.
La Prensa has a detailed explanation of the causes of flooding in low-lying neighborhoods of San Salvador at this page.
You can see a gallery of photos of the current flooding at this link.