The how and the why

According to a report in this newspaper, just a week following its construction, a riprap collapsed in Barangay Cabadiangan, Compostela Town.

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Thankfully, no one was hurt in the incident, but several parked motorcycles were buried under huge rocks as a result. A team from the Provincial Engineering Office has gone to the site to see what went wrong. An inspection yielded structural failure, but what exactly was the cause of structural failure? What makes it alarming is that that structure barely lasted a week when we expect it was supposed to stand at least many years. Of course, we can't come up with conclusions yet without the results of the inves