Traduit du forum anglais De: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk [mailto: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] De la part des quais, ALR <adrianp@sun.ac.za > Sent: 06 Mars 2010 09h56 To: sarnissa-african-aquaculture Mailing List Subject: Re: [Sarnissa moines-african-aquaculture] et de bornes-fontaines Cher Raymond, Je voudrais apporter une précision ici. Un moine n'est pas simplement un moyen de drainer les étangs, il a une triple fonction. 1. Niveau de contrôle 2. Drainage Pond, et 3. Dépassement de la protection La dernière étant la plus importante. Avec les pluies ici présents en Ouganda, il démontre mon point. Si les tuyaux sont utilisés pour le drainage, un déversoir séparé doit encore être ajouté à n'importe quel bien construit étang. Si les coûts sont additionnés, un tuyau plus un évacuateur de crues est toujours plus cher qu'un moine. Adrian Piers, African Fish Ltd Rédacteur du bulletin, de l'Aquaculture Association d'Afrique australe et Aquaculture Institute d'Afrique du Sud Téléphone + +27 21 808 3712 Mobile + +27 (0) 73 264 4280 From: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of Piers, ALR <adrianp@sun.ac.za> Sent: 06 March 2010 09:56 To: sarnissa-african-aquaculture Mailing List Subject: Re: [Sarnissa-african-aquaculture] monks and standpipes Dear Raymond, I would like to make a clarification here. A monk is not simply a means of draining ponds, it has a threefold function. 1. Level control 2. Pond drainage, and 3. Overflow protection The last being one of the most important. With the present rains here in Uganda it demonstrates my point. If pipes are used for drainage, a separate spillway still needs to be added to any well constructed pond. If the costs are added up, a pipe plus a spillway is invariably more expensive than a monk. Adrian Piers, African Fish Ltd. Newsletter Editor, Aquaculture Association of Southern Africa and Aquaculture Institute of South Africa Phone ++27 21 808 3712 Mobile ++27 (0) 73 264 4280 From: sarnissa-african-aquaculture-bounces@lists.stir.ac.uk [mailto:sarnissa-african-aquaculture-bounces@lists.stir.ac.uk] On Behalf Of Raymond Mwangata Sent: 06 March 2010 10:30 AM To: sarnissa-african-aquaculture@lists.stir.ac.uk Subject: Re: [Sarnissa-african-aquaculture] monks and standpipes thanks for your observation.but i would relate this to the cost of the two.most of the ponds am seeing in east Africa are semi intensive systems and are owned by small scale fish farmers at subsistence level.this therefore translates the fact that its cheaper to get a 2 meter PVC pipe as drainage structure compared to a monk which requires building materials and cost of labour which most farmers can not afford. regards, Raymond Ministry of fisheries development. Nakuru fisheries station Rifty valley region.Kenya. cell: +254722902914
Date: Fri, 5 Mar 2010 16:07:06 -0600 From: veverkl@gmail.com To: sarnissa-african-aquaculture@lists.stir.ac.uk Subject: [Sarnissa-african-aquaculture] monks and standpipes
Dear all, In the early 1980's we made a training manual for fish farming in Rwanda and one of the tables in the manual gave a comparison between monks and PVC standpipes as drainage structure for fish ponds. It also offered the cut-levee option for pond draining. In Kenya, we made a comparison between standpipes inside the pond and standpipes outside the pond during the various pond construction training programs that were held. As I look at the information coming out of West Africa, and from other visits, I see that the fish ponds still have monks and some of the newly constructed ponds use monks. Whereas in East Africa, almost all of the fish ponds have switched to PVC standpipes as drains, except for very large ponds, where a monk-type drainage structure is often less expensive. There are certain construction principles that must be followed for each and if they are not, then the functionality is severely compromised. I am wondering, however, why it is that there is such a difference between West Africa and East Africa; or is it only my imagination? Regards to all, Karen
Karen L. Veverica Department of Fisheries and Allied Aquacultures Auburn University, AL office: +1-334-844-4667 cell: +1-334-332-1560 cell in Uganda: +256 782-970622 http://www.ag.auburn.edu/fish/international/uganda
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