+- +-

+-User

Welcome, Guest.
Please login or register.
 
 
 
Forgot your password?

+-Stats ezBlock

Members
Total Members: 51
Latest: JUST4TheFACTS
New This Month: 1
New This Week: 0
New Today: 0
Stats
Total Posts: 13731
Total Topics: 269
Most Online Today: 4
Most Online Ever: 137
(April 21, 2019, 04:54:01 am)
Users Online
Members: 0
Guests: 1
Total: 1

Author Topic: Dam Hydropower  (Read 1601 times)

0 Members and 0 Guests are viewing this topic.

AGelbert

  • Administrator
  • Hero Member
  • *****
  • Posts: 30777
  • Location: Colchester, Vermont
    • Renwable Revolution
Re: Dam Hydropower
« on: May 18, 2015, 06:41:44 pm »


Damn Dams: A choking hazard for Amazonia

A new report by WHRC scientists Marcia Macedo and Leandro Castello highlights hydroelectric dam projects in the Amazon as a key threat. The report, commissioned by the Living Amazon Initiative of the World Wildlife Fund, entitled, “State of the Amazon: Freshwater Connectivity and Ecosystem Health” reviews the current state of watershed ecosystem health and identifies key threats and opportunities for conservation across Amazonia. The report finds that planned hydroelectric dam projects will constrict every subwatershed and undermine the health of the entire Amazonian watershed.

The health of the Amazon watershed depends on annual flood cycles, which cause rivers to swell by as much as 20 meters each year. As river water overflows into the floodplains, rivers become connected to surrounding forests.

This annual flood pulse serves as a giant mixing bowl, transferring vital sediments and nutrients and providing a highway for fish migration.
Dam projects sever these essential connections, increasingly fragmenting individual subwatersheds and undermining the health of the whole Amazon system.


Dams are not the only threat to watershed health.
The region continues to be at risk from deforestation, mining and hydrocarbon extraction, and climate changes, all of which may change the annual flood pulse and river connectivity.

Economic pursuits tend to increase energy demand, which drives the construction of more hydroelectric dams in the region. But these cumulative impacts are often ignored in environmental policies governing dam construction. Environmental impact assessments only consider the effects of individual projects, making it virtually impossible to achieve integrated watershed management. 




The Amazon Basin spans seven nations, which is perhaps the biggest challenge to holistic watershed management. Healthy river systems depend on connectivity and do not respect political boundaries. In many cases, economic development activities in one country can incur environmental costs in another, yet there is not an overarching policy framework to help coordinate management activities across country boundaries.

Developing such a multinational framework is both the biggest challenge and the biggest opportunity for conserving Amazon freshwater ecosystems and supporting the productive fisheries and human populations that depend on them.
http://bit.ly/1I3BQJe

http://whrc.org/news/newsletter/pdf/WHRC_Newsletter_May2015.pdf
Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life. Pr. 13:12

 

+-Recent Topics

Corporate Fascist Corruption of Christianity by Surly1
October 22, 2019, 08:24:38 am

Corporate Profits over Patient in the Health Care Field by Surly1
October 22, 2019, 07:58:51 am

Doomstead Diner Daily by Surly1
October 22, 2019, 07:47:20 am

🌟 IMPEACHMENT SCORE 🌠 by AGelbert
October 21, 2019, 09:17:36 pm

2020 Presidential Election by AGelbert
October 21, 2019, 09:08:51 pm

Money by AGelbert
October 21, 2019, 08:54:38 pm

BREXIT by AGelbert
October 20, 2019, 06:22:40 pm

Global Warming is WITH US by AGelbert
October 20, 2019, 03:07:34 pm

Apocalyptic Humor by AGelbert
October 19, 2019, 08:27:57 pm

War Provocations and Peace Actions by AGelbert
October 19, 2019, 05:35:46 pm