Actually a lot of change happened to my greenhouse after the post I made. After an year or so, I replaced the whole roof of greenhouse with a polysheet to avoid rain water falling inside and to give more controlled environment to do all kinds of experiments. So rain water is not a problem now..
Coming to your question, if you use shade net, rain water will pour in. best way to is ensure all the pots have proper drainage and all the plants are properly trellised or supported with proper stakes so that they stay up. Mulching the top with polythene mulch sheets will prevent water from entering the media but not really necessary.
Over watering is not a problem as long as good drainge is there. you will run into leaching issues but you can compenstate with some more fertilizer. oh BTW are you doing rain water harvesting? If you do you might want to think about how to filter the garden related debris/impurity.
hope this helps
we have a rain water harvesting system (mine is an independant house) but no storage ie it just seeps into the ground. we have a couple of sink pits around the house and I also have lawn/plants all around (ie not cemented) so rain water has a chance to sink in.
how much does the poly sheet cost - I have quite a bit of terrace space - may be 1200 sq feet so I am planning something for say 500 sq feet as I do not want to close up the entire area - plus the association people might get angry ???
mainly for growing in the summer when it gets very hot here in hyd. otherwise I feel we are lucky to have this much sun and a long long growing season.
so if the top is polysheet and sides being shade net - we can have air around and grow in good amount of sunlight does that sound right to you.
thanks for all your help
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