WELCOME

Irrigation Department

Kilinochchi

WATER RESOURCESDEVELOPMENT

OF JAFFNA PENNISULA

 BY DEVELOPING

 JAFFNA LAGOON

SCHEME 

By

Provincial Irrigation Department

CONTENTS ·     Objectives·     Involvement of Provincial ID·     Components of Jaffna Lagoon Scheme·     Problems·     Identified Proposals

·     Irrigation department Findings

OBJECTIVES

·  To introduce the components of Jaffna lagoon scheme ·   To summarise the identified proposals so far ·  To explain the present situation of the Jaffna lagoon scheme ·  To recommend some proposals for immediate implementation  ·   To recommend some proposals for future studies  ·  To recommend some proposals for future implementation

Involvement of Provincial Irrigation DepartmentIn Jaffna Peninsula

 Northern Provincial Council

Ministry of Irrigation, Agriculture, Lands, Fisheries, and Animal production

Prov.Director of Irrigation 

Prov.DDI, Kilinochchi Range 

Irrigation Engineer, Jaffna. 

IE, Jaffna is responsible, on be half of the IE, Jaffna is responsible, on be half of the Government of Sri Lanka for operation and Government of Sri Lanka for operation and

Maintenance of;Maintenance of;  

·                Valukkaiaru Drainage Scheme ·                Valukkaiaru Drainage Scheme

·                Upparu Drainage Scheme·                Upparu Drainage Scheme

·   Thondamanaru Drainage Scheme·   Thondamanaru Drainage Scheme

Valukkaiaru Drainage SchemeValukkaiaru Drainage SchemeNow Barrage is being repaired Now Barrage is being repaired

Ariyali Barrage July 2002.Ariyali Barrage July 2002.

Araly Barrage November 2001Araly Barrage November 2001

Jaffna Lagoon scheme

• Upparu Drainage scheme

• Thonamanaru Drainage Scheme (Vadamarachchi lagoon scheme)

• Elephant Pass Lagoon scheme

Could be categorized as Jaffna Lagoon scheme

Components of Jaffna Lagoon Scheme

Northern Barrage at Thondamanaru Vadamarachchi Lagoon Bridge at Vallai of Vada. Lagoon Bridge at Chavakachcheri -Road Bridge at Thalayady - Pallai Road Some Flood Bund in Lower Places Elephant pass lagoon

Chundi kulam Spill Cum Causeway Elephant pass Peripheral Channel Link Canal Elephant pass Bridge (already closed) Some flood Bund in lower places

Components of Jaffna Lagoon Scheme (Cont)

• Upparu Lagoon • Ariyalai Barrage • Separation Bund at Kappoothu • Flood Bunds in Low Places • Bridge at Koppay – Kaithady Road

• Bridge at Madduvil – Puththoor Road

Problems

·  Un controlled pumping and no planning for recharge of ground

water is causing severe threat to the ground water potential as well as quality of water in Jaffna peninsula

 · Due to the non maintenance of the salt water exclusion system

in Jaffna peninsula, sea water intrusion has taken place in to

the land area  

· Many thousands of acres of fertile land has become saline and abandoned with out cultivation in Jaffna peninsula

 · Many hundreds of dug wells have also been abandoned

due to salinity

History and Proposal of JL Scheme  1879--- Mr. Twyneham GA, NP, has proposed Damming the sea water from entering

to the lagoons – - Given up due to big flood disaster

  1913--- Mr. Fesling GA, NP, Took it up the proposal and given up  1916---Mr.Horesburg started the part of the project, Blocked the Culverts across

Point pedro – Chavakachcheri road – It was functioning well from 1920 to 1923  1942--- Mr.Webb proposal came up – Thonadamanaru Barrage Constructed 1947 – 1953, Ariyalai Barrage constructed -1955   1962--- Eng.S.Arumugam has proposed converting Elephentpass lagoon and

Vadamarachchi lagoon in to Fresh water lakes to accelerate the leaching process.

 It got failed – because Ø   Sea water seepage through Kandy Jaffna road bridgeØ   Damage of Eastern closure bund due to the settlement of subsoil below the bund

Proposal from Irrigation Department in 1976 headed by Eng.K. Shunmugarajah

• Eastern closure bund of 4700ft with the spill cum causeway of 7000 ft. •   Access road of 6 miles also planned to be improved•   Link canal of 2.5 miles with regulator•   Imp.to Thondamanaru Gates•   Repairs to Ariyalali Barrage Gates •   Separation Bund at Kaputhu •   Imp. to all Flood bunds

Benefits shall be anticipated• Reclaiming 11,000.00acs of non arable land

Supplement 20,000.00acs of rain fed cultivated land for good and assured yield

•  Ground water improvements in the peninsula• Livestock improvements in the lagoon surrounding area

In 1983, the summery of Mr.K.Shunmugarajah’s report was submitted to His Excellency Mr.J.R.Jayawardana, President of Sri Lanka, on his request. By ; Prof. H.W.Thambaiah

Eng.S.Arumugam Eng.K.Shunmugarajah

• Existing Features

Thondamanaru Barrage

Total length 628ft

Ariyalai barrage

540ft length

No of upper gates 18

Size 20ft*4ft

Sill 0

No of Gates 42

Size 5.5ft* 5.0ft

Sill -1.0MSL - Crest +4.0MSL

No of lower gates 13

Size 20ft * 3ft

Sill -3

No of subsidiary sp gates 16

Size 20ft * 2ft

Sill +2

Tot.Area of Jaffna 400 sq.ml

Vad lagoon area 30 sq.ml

Upparu lag.area 10 sq.ml

EP lagoon area 40sq.ml

Catchment area of Vad.Lagoon Tot.Area of Jaffna

115sq ml

Catchment area of Upparu 85sq.mls

Catchment area of EP 363sq.ml

Irrigation Department Recommendations

Upparu Scheme

1.   Ariyali Barrage gates could be rehabilitated with necessary improvements.

 2.   All Flood Bunds or Salt Water Exclusion bunds could also be

rehabilitated including the drainage channel clearing, and de-silting the lagoon area to the original profile.  

3.   Upparu lagoon could be considered to divide the area into THREE or FOUR sectors by constructing Barrage or gates to the bridge as shown in the map

 4.   Separation Bund is not necessary, since both the lagoon are going to be

with fresh water. But for the safe side, it is better to consider the rehabilitation. 

5.   If it is necessary, the first sector, could be considered for CONTROLLED SALT WATER CONTENT AREA for the development of Salt water fishing and its related activities. ( Further studies are Required)

Vadamarachchi lagoon

1. Thondamanaru Barrage repairs is being done

2. Vada. Lagoon could be divided into FIVE SECTORS by constructing, Barrage or gates to the bridge at Vallai. Chavakachheri road, Mullipalam, Pallai road and finally the gate at mandalai as shown in the

 3.   The first sector from Thondamanaru to Vallai shall be considered for CONTROLLED SALT WATER AREA for the dev. of fisheries sector. ( Further Studies are required)   4.    All Flood bunds or Salt water exclusion bund along the periphery of the lagoon on either side shall be rehabilitated including de-silting the lagoon to the original profile.  5.    Further studies are required

Elephent Pass lagoon

1. EP Lagoon could be divided into THREE SECTORS by constructing peripheral bunds leads to send flood water as well as drainage water to Vad.lagoon through Mandalai- Mthurankeny cannel as shown in the map

2. Eastern and western sides of the lagoon could be kept with salt water.

3. Further studies and final investigations are required to;

Section of the peripheral bund ( it is advisable to have clay core and rock fill bund to function as spill cum bund)

Width and discharge of the two peripheral channels and channel leads to Vad. Lagoon have to be decided ( 5000 cusecs and 250 to 300 ft BW)

Is the opening of EP Bridge to be reopened to discharge the flood water – western portion to the sea

Is it possible to issue water from the Iranaimadu tank to supplement drainage water, when it is not enough to cater the nominal demand of water to Vad.Lagoon

Thank you