The others are right but I know that not everyone can take and send pics (for example my phone is not working). However, you can still paint a picture with words. If it is overwatering, roots will be brown/black and mushy. Underwatering, grey or white and shriveled roots appear. Also, look for bud loss patterns they seem to fall off quicker when dehydrated.

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Found this article online and think it can help:

Drooping leaves
When orchids take on a droopy, wrinkly appearance this is usually a sure sign of a watering problem and in most cases a root problem. Either way, the pot has been kept overly wet and soggy (sitting in water) and has experienced root loss and therefore cannot up take water, or has been left extremely dry and has had no water to uptake. Quite ironic that leaving your orchid in a pool of water would cause it to suffer from thirst!

The first thing to do is to remove the potting media and determine the problem…brown and mushy roots= too much water, grey and shriveled roots= not enough. If the plant was under watered a 5-10 minute soak in clean, warm water would help a bit. Next remove all dead or soft roots and wash the plant under tepid water. At this point it would be recommended to treat the plant with an anti-bacteria/fungal like Phyton 27 or ground cinnamon at the least before repotting. Make sure to choose a pot that is just big enough for the remaining root system even if this means going DOWN in pot size. This is very important; sometimes you need to take one step back to take one step forward. At this point, if it has suffered from major root loss it would be helpful to stabilize the plant in its new pot by either using a rhizome clip or simply wiring the plant into the pot after repotting. Water the plant thoroughly and set it out in filtered light avoiding any extreme conditions.

The next couple of weeks will be the most important. This is when you want to encourage new root growth with a balance of higher humidity and a slight restriction of water in the pot. Do this by not watering for the next 10 days coupled with misting the leaves regularly. This should encourage new roots to break into the new potting media in search of water. After the first 10 days resume normal watering. Keep in mind the old leaves won’t recover from the droopy appearance but the new leaves that grow will be turgid and wrinkle free.