人工翻译一下,谢谢大神The design of the modificationsincluded an upstre

人工翻译一下,谢谢大神
The design of the modificationsincluded an upstream cutoff trench; a zoned upstream embankment section,including a filter layer placed on the existing upstream face of the dam; and abreach of the embankment to allow for the outfall of the upstream drainagecollection system. Once construction of the modifications was complete, seepageincreased dramatically during first filling, and sinkholes on the upstreamslope delayed the return to normal operation. Extensive investigations tookplace to determine the source of the seepage and the cause of the sinkholes,details of which are presented below.