Refine search results

All    Any    Exact phrase

Search hint

All - search for events containing all entered keywords

Any - search for events containing any, some, or all of the entered keywords

Exact phrase - search for events where keywords appear exactly as entered

Dates

to

Region

Distance

Within of post code (UK Only)

Login for more refinement options

Application of Side Scan sonar technology and Isotope Techniques to confirm reservoir leakage - Samanalawewa Reservoir

Lecture

Image of three blue heads in profile on grey background

Application of Side Scan sonar technology and Isotope Techniques to confirm the reservoir leakage ingress of the Samanalawewa Reservoir

Date and Time

04 April 2013 - 17:30-19:00

Location

Colombo 1, Sri Lanka - icon_popup  (See map)

Organiser

Joint Event.
Contact Eng. Rukmal Jayasinghe - Hony. Secretary (0777751343) for more information.


About this event

The Samanalawewa reservoir on the Walawe river of Sri Lanka was built during the period 1986 to 1991. It is formed by a 100m high embankment dam and is the main element of the 120MW Samanalawewa Hydroelectric project. The dam is built in an area of complex geology, showing Karstic characteristics. Indications of a possible water leak through the right bank were surfaced when poor geological conditions were encountered during construction of the dam.  During the initial trial impoundment, the reservoir started to leak from its right bank with the reservoir partially filled, and impoundment was suspended. 

Attempts were made twice to remedy the leakage firstly with a 100m-deep, 1300m long grout curtain and then secondly with a clay blanket constructed over the suspected ingress zones. However both attempts could not stop the leakage. Although the second attempt did help to reduce groundwater pressure in the right bank.  The reservoir is presently operating with a continuous leakage of about 2000 litres per second.  

An analysis conducted on the right bank ground water level behaviour indicated that the possible leakage ingress areas are lying towards the right abutment of the dam. Later in 2011 a field exercise engaging Radio Isotopes was conducted to verify the above findings. The study confirmed the existence of inlets in the said area. Then again early this year underwater side sonar scanning of the suspected area was conducted to verify the findings further. The side sonar survey indicated images of anomalies in the ground profile which are considered to be the leakage inlets in the area identified.



Programme

17.30 - 19.00 Hrs

Cost

LKR 1,500/- for Non Members

Additional information

The lecture commences at 5.30 pm. Refreshments will be served after the lecture. Non-members will be charged at Rs.1,500/= per head.

Registration information

Online Registration - https://localevents.theiet.org/register.php?event=a9a846

Register

Are you looking for more events?

You might also be interested in (search more events)

Person presenting at an event (image)

Conference - Wed 30 April 2014 at 09:00

A great opportunity for industrialists to hear from, and speak directly with, a broad spectrum of their end-users, and offer academics working in this field a platform from which to present their short to near-term future technology developments.