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Home: KOI Talk: Pond Water Quality:
RAIN

 





 


Melvin Tan
Koi Lover

Jan 18, 2000, 1:00 PM

Post #1 of 8 (2509 views)
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RAIN Can't Post
Hi to all,

I've noticed that when there is a heavy downpour of rain, my outdoor pond water seems clearer thereafter whereas a light drizzle actually blurs up the water slightly and it takes around half a day for the water to clear.

My theory is that this could be due to building construction work going on nearby to where I live - light drizzle absorbs all the dust/dirt from the air and dumps this onto the pond. But in the case of a heavy downpour, a lot of water ends up in the overflow pipe and in effect there is a sort of natural water change.

Would like to know if anyone else has a similar experience?

Cheers!


Tan Beng Teck
Koi Lover

Jan 18, 2000, 11:57 PM

Post #2 of 8 (2508 views)
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Mel,
That's can only be defined as pond quality, including the surrounding.

Naturally the downpour will overflows your pond water and clear it of the unfavorable elements on it. As I also notice its crystal clear at the fish farm but not in my old office pond!

If the water is allows to overflows out, not in, it may do auto clear with your "daily" 20% water change. My old office pond does the opposites and the dirt flows into the pond and makes it milky color after the downpour.


Khoobg
Webmaster


Jan 19, 2000, 12:18 AM

Post #3 of 8 (2508 views)
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Hi Melvin,

Mine with a overflow is also extremely clear after a heavy down pour.


Melvin Tan
Koi Lover

Jan 19, 2000, 2:40 AM

Post #4 of 8 (2508 views)
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Hi,

I think we have acid rain in SGP.

Yesterday it rained from around 1 pm to around 1 am this morning at my home. Rain was a combination of massive downpour, drizzle, etc. Since I had nothing better to do, I did a ph test on my pond at around midnight. Ph reading was 6.5 which is way down from my pond's average of 7.5. Did another ph test at 9 am this morning and ph had increased to 7 - probably 'cos it's a cement pond.

Will try to collect some rain water next time and test it's ph.

Moral of the story - seems that even the rain water here is not be good for the koi.

Cheers!


KMChong
Koi Lover

Jan 19, 2000, 3:27 AM

Post #5 of 8 (2508 views)
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RAIN [In reply to] Can't Post
I find that fishes are extremely active when it is raining.

Further to that after heavy rain pour, the algae seem like drown at the bottom of the pond.

I wonder whether when it is raining, the chemical floating in the air due the air polution will be dissolved into some sort of acid that will be harmful to the fishes. So, should we do partial change of water after the rain stop?


Mark
Koi Kichi

Jan 19, 2000, 6:05 AM

Post #6 of 8 (2508 views)
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Do look out for pH swing and/or crash! Its always good to have baking soda handy in your first aid box.


Melvin Tan
Koi Lover

Jan 20, 2000, 1:33 AM

Post #7 of 8 (2508 views)
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Hi,

I change 10-20 percent water weekly. On this basis I don't bother with any water change after heavy rainfall as I think that the weekly water changes should suffice.

H'vr if the ponds are pvc or pvc lined and no buffer material in the bio-filter, as Mark mentioned it would he handy to have baking soda in case of ph crash.

I understand that most algae do better in water with higher ph - the sudden fall in ph might adversely affect them. This is good for a clear water pond.

Another thing, some owners regularly seed their ponds with bacteria but this must not be done after a heavy downpour as the increase in bio-activity will result in a further reduction of ph, and even a ph crash.

Cheers!


Hans Ham
Deleted

Jan 20, 2000, 4:22 AM

Post #8 of 8 (2508 views)
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Hell!
We have acid rain in K.l & Singapore ,for the last 15 years if not longer.
If you have a good skimmer ,run it to max.during rain,as the first 20 min. of rain a lot of dirt and dust will get in the pond.
Also have a good overflow that will help ,to get rid of some of the dirt.

rdgs.hans



(This post was edited by Hans Ham on Jul 1, 2001, 2:00 PM)

 
 
 



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