RECEDING, POLLUTED YAMUNA
Media reports in 2011 suggested the receding Yamuna is weakening the sal wood ( Shorearobusta) in the foundation of the Taj Mahal which needs constant moisture to prevent it from cracking. Taj's foundation, built of brick, watertight mortar and wood, is supported by circular wells dug in the river bank to give it stability. The low flow in the river and the high pollution are also major causes of concern. ASI, however, says it has no evidence that wood has been used in the foundation.