 |
 |
There are many strategies that can be used to alleviate urban flooding. On a large scale basis, big detention ponds are certainly one way of achieveing this. These ponds may be either "dry" (ie fully draining after the storm) or wet detention ponds. Another form is aquifer recharge and re-use (being used in those locailities that have the luxury of an underground aquifer to tap into - like Adelaide in South Australia). On a smaller scale, the installation of multiple on-site management devices which replicates the pre-development storm discharge on each individual block (say when each block is undergoing redevelopment) is another way. This nessesarily requires regional co-ordination. This is the process being adopted in suburban local council's in Sydney and many other parts of urban Australia. Some examples include domestic rainwater tanks with an internal feedline to internal water use, also on-site detention tanks, etc. A project has been developed in Sydney called 'water Sensitive Urban Design'; More information see the web site: www.wsud.org <http://www.wsud.org> . I hope this helps. Mark Sabolch Group Leader Environmental Engineering Willoughby City Council phone (02) 9777 7518 -----Original Message----- From: ELISHA MUTYABA [mailto:[log in to unmask]] Sent: Monday, 2 June 2003 7:38 PM To: [log in to unmask] Subject: Rainwater ponds in a city Last week I read an article in our local newspaper which left me confused. There was this South African PhD holder (Dr. somebody) I can not recall the name, who was advising the City Council to dig a number of rainwater ponds as a way of controlling the floods in the city. Kampala city is not a flat city and the receiving lake is less than 4 Km away. There is a reasonable slope along the drain line. Further more, today malaria is one the challenges of the Kampla city occupants. I do not understand why one needs to add on more mosquito bleeding centres. My question is: Are ponds the best recommeded drainage structures for such a situation????. Elisha _____ Do you Yahoo!? Free online <http://us.rd.yahoo.com/mail_us/tag/*http://calendar.yahoo.com> calendar with sync to Outlook(TM).