What are the things you need to do with your outdoor Koi pond after the storm? First, relax and just take your time to breathe, because your fish are just fine: they're just traumatized by the extreme weather that they have experienced (a normal reaction for any pet who's been under such an unusual situation). Unless there's a huge amount of damage done to your pond, do not worry about your pets' health. You should rather focus on their home, which may be in need of some repairs.
Now, you either have prepared for the storm completely or may have been taken by surprise by it... but no matter what your case is, make sure that no further damage will be done to it.

Here are the necessary things that you should do. First, disengage all storm precautions you made so that you can survey possible damages that have happened. If your pond has been covered by a net, remove as many debris as you can off the net before removing it. Once removed, you'll be able to make a survey of the damage and then check the condition of your fish.

If you have been expecting high waters and your sand has then extended beyond the usual poind in your pond's area, you should remove all of the sand bags for you to have an easy access in your pond (given that the water level is normal too). Now, don't fret or get discouraged if things seem out of their place, and it may not be as bad as its original setup.

Once all of the netting and the other precautions has been removed, take your time to observe and examine the area. If you get to see debris, skim them over and net them so that they will be removed. If your plants and other decorations have been uprooted or put out of place, just put them again to their original spot.

Now, if your pond has undergone a major damage, remove your Koi immediately from the pond. Although proper bagging as well as transporting techniques are needed if the damage will take some time to get fixed, there are some transitory options that you can have if the damaged can be fixed fast. You can always use a children's pool to serve as a temporary home for your Koi. Contact your local pet store or local zoo and inquire of any available program that can help you house your Koi until the needed maintenance can be made.

If it only requires small repairs, what you should focus on is the water quality. Your pond's water may now seem dark or cloudy because of the storm and the extra water given by the rainfall. There's no need for you to worry about ammonia issues if the storm lasted for a long time. Then test your water if it contains Nitrates. If these are present, what you do is you add the right amount of salt to the water (about three-fourths to a pound of salt per 100 gallons of water).

It may be a good idea to add more salt if your fish got shocked by the storm or if they got any type of injuries (if you have plants lying around in your pond, remove them first before adding the salt). Just keep in mind that your fish should be of primary importance compared to your plants.

If you have KH issues (especially those that fall below 100), what you can do is add baking soda to your Koi pond (1 cup of unpacked baking soda per 1000 gallons of water). This will serve as a protection for your Koi pond from the pH crashes that may occur in the future.