KennethHH
01-03-2010, 03:20 PM
Please visit my wildlife friendly ciulverts site.
http://wildlfc.webs.com/index.htm
Excerpt:
...Culverts have been installed for hundreds of years and this has removed habitat for 35 to 40 different wildlife species. There is a solution for this concern but only a few States in the US are incorporating the solution. Three main reasons why I believe many States do not install wildlife friendly culverts.
1. Huge culverts that allow large animal crossing of roads are very costly
2. Arched wildlife friendly culverts are also very costly
3. Replacement arched culverts may allow too much flow and housing flooded downstream
A high percentage of biomass of areas is composed mostly of small animals and installing wildlife friendly culverts only for these animals will minimize cost in item 1. Sketch SK-1 has a design where a standard circular culvert can be converted to a wildlife friendly culvert for the same cost except concrete footing and support will need to be added. This culvert should performance just as good as an arched culvert removing most of the added cost of item 2. Because replacement circular culverts have the same area as the old culvert seems like the new culvert resistance will not be more than the old culvert and there should not be much concern for adding flooding downstream removing most of the concern for item 3. This is only an idea and a review by design and engineering would need to be performed to determine if this is true....
http://wildlfc.webs.com/index.htm
Excerpt:
...Culverts have been installed for hundreds of years and this has removed habitat for 35 to 40 different wildlife species. There is a solution for this concern but only a few States in the US are incorporating the solution. Three main reasons why I believe many States do not install wildlife friendly culverts.
1. Huge culverts that allow large animal crossing of roads are very costly
2. Arched wildlife friendly culverts are also very costly
3. Replacement arched culverts may allow too much flow and housing flooded downstream
A high percentage of biomass of areas is composed mostly of small animals and installing wildlife friendly culverts only for these animals will minimize cost in item 1. Sketch SK-1 has a design where a standard circular culvert can be converted to a wildlife friendly culvert for the same cost except concrete footing and support will need to be added. This culvert should performance just as good as an arched culvert removing most of the added cost of item 2. Because replacement circular culverts have the same area as the old culvert seems like the new culvert resistance will not be more than the old culvert and there should not be much concern for adding flooding downstream removing most of the concern for item 3. This is only an idea and a review by design and engineering would need to be performed to determine if this is true....