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Bhutan: Thorthormi lake levels, Punakha’s confluence and Gangtey-Phobji cranes
At Thorthormi, an evaluation records different drawdowns in three lakes; two rivers join beside Punakha Dzong, while a 2016 Ramsar sheet reports about 300 cranes wintering in the Gangtey-Phobji valley.
At a glance
- Thorthormi channel gradient
- The 2014 evaluation links Subsidiary Lake I’s 3.66 m reduction to a channel gradient of 2%.[1]
- Punakha Dzong
- The 2012 Bhutanese submission dates Punthang Dechenphodrang Dzong in Punakha to 1637.[3]
- Gangtey-Phobji water use
- The 2016 Ramsar sheet says people in 44 valley villages depend on wetland water.[4]
A place worth remembering
Thorthormi: three different lake drawdowns
The 2014 assessment for UNDP explains the smaller reduction in Subsidiary Lake I: a 2% gradient along the excavated channel meant the planned 5 m lowering was not required. It reports cumulative reductions of 5.04 m in Thorthormi’s main lake, 5.08 m in Subsidiary Lake II and 3.66 m in Subsidiary Lake I.[1]
Punakha: a dzong beside two rivers
Gangtey-Phobji: wintering cranes and wetland water
The Ramsar Information Sheet last published in 2016 reports about 300 black-necked cranes (Grus nigricollis) wintering in the Gangtey-Phobji valley from October to March. The sheet also identifies the wetland as a source of water for valley residents and reports that people in 44 villages rely on it.[4]
Good to know
A few clear answers before you explore.
Why did Subsidiary Lake I not need the planned 5 m drop?
The evaluation says its excavated channel kept a 2% gradient along its length, so the planned reduction was unnecessary; the lake fell by 3.66 m.[1]
Which rivers meet beside Punakha Dzong?
PHPA-I names the Phochhu and Mochhu; their joined flow forms the Punatsangchhu downstream.[2]
How do residents use the wetland’s water?
The 2016 sheet says valley residents use it for drinking water and irrigation.[4]
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