Ecological adapted stormwater treatment in Kretinga town, Lithuania

General

National Id:

Lithuania_02

Site name:

Kretinga town is a city in KlaipÄ—da County, Lithuania. It is the capital of the Kretinga district municipality.

Summary:

Kretinga is located 12 km east of the popular Baltic Sea resort town of Palanga, and about 25 km north of Lithuania's 3rd largest city and principal seaport, Klaipėda. The Stormwater Special Plan developed introduces a new approach towards more sustainable stormwater solution from an environmental perspective. This type of ecologically adapted stormwater investments have been implemented in Lithuania for the first time. If they function as well as predicted and can be disseminated through appropriate channels, there should be good possibilities to introduce similar investments in other Lithuanian towns.

NUTS Code:

Lietuva

RBD code:

LT2300

Transboundary:

Source(s):

Kretinga Special plan and Stormwater Treatment, Akmena-Dane, Lithuania, Report 4.3.3.

NWRM(s) implemented in the case study:

Retention Ponds

Site information

Type:

Case Study Info

Light or indepth?:

Light

Monitoring maintenance

Monitoring impacts effects:

Monitoring location:

Catchment outlet

Monitoring parameters:

Suspended solids, total phosphorus, total nitrogen, metals (cadmium, lead, zin), pathogenic bacteria

Performance

Performance impact estimation method:

Edge of Field/Plot

Performance impact estimation information:

Estimated reduction of contaminants in the designed and constructed facilities: 1) SS †“ 80 percent. 2) Total phosphorus †“ 50 percent. 3) Total nitrogen †“ 30 percent. 4) Metals †“ cadmium, copper, lead and zinc †“ 50 percent. 5)Pathogenic bacteria †“ 70 percent.

Biophysical impacts

Retained water:

7776

Retained water unit:

m3/day

Information on retained water:

90 l/s in total (40 l/s in one and 50 l/s in another retention pond)

Water quality overall improvements:

Positive impact-WQ improvement

Water quality Improvements Phosphorus (P):

Water quality Improvements (P) unit:

% reduction pf pollutant

Water quality Improvements Nitrogen (N):

Wq Improvements n unit:

% reduction pf pollutant

Water quality Improvements Total Suspended Solid (TSS):

Water quality Improvements (TSS) unit:

% reduction pf pollutant

Water quality Improvements Copper (Cu):

Water quality Improvements (Cu) unit:

% reduction pf pollutant

Water quality Improvements Zinc (Zn):

Water quality Improvements (Zn) unit:

% reduction pf pollutant

Water quality Improvements Escherichia Coli (e.coli):

Water quality Improvements (e.coli) unit:

% reduction pf pollutant

Water quality Improvements fecal coliforms (fecal coli):

Water quality Improvements (fecal_coli) unit:

% reduction pf pollutant

Lessons, risks, implications...

Key lessons:

1) reduction of formation and collection of stormwater, for example installation of impervious surfaces shall be avoided (except in potentially polluted territories), clean stormwater absorbing soil facilities should be installed, projected areas of potentially polluted territories shall be as small as possible, etc., 2) reduction of the amounts of stormwater, centrally discharged into the environment, e. g. allow utilization of stormwater in the production process, watering of green areas, fire extinguishing, etc., and 3) reduction of pollution levels in stormwater, e.g. implement dry cleaning of potentially polluted territories, construct sheds in most hazardous areas.

Success factor(s):

Type	Role	Comments
Attitude of decision makers	main factor
Financing possibilities	main factor	EU funding was a big help.
Available support tools	main factor	During the MOMENT project, it was possible to gain knowledge about the similar retention ponds in Sweden. As this was one of the first (pilot) retention ponds in Lithuania, therefore, knowhow was very usefull.
Legal obligations	main factor

Financing:

Type	Comments
EU-funds: Rural development funds	EU structural support according to the objectives provided in Cohesion Promotion Operational Programme;
National funds	State budget;
Sub-national funds	municipal budget;
Private funds	budget of municipal enterprises, providing services of stormwater management.

Barrier:

Type	Role	Comments
Legal obligations / restrictions	secondary barrier	There were some problems with planning paths for leasure zone near retention ponds, as there are building restrictions in such wastewater treatment areas, but the problem was successfully solved.

Driver:

Type	Role	Comments
Legal obligations		Might be also other reasons, but the stormwater discharge in Kretinga town did not in some parameters comply with the pollution requirements before the construction of the two retention ponds

Socio-economic

Costs investment:

188000

Costs investment information:

Cost effectiveness estimations have not been calculated. It would be interesting to compare e.g. construction and operation costs of wetland/retention pond (such stormwater treatment facilities are under construction in Kretinga town) with conventional oil-sludge separator, taking into account removal of pollutants per unit costs. Evaluations will be carried out of the decrease of nutrients (P and N), hazardous substances, suspended solids and BOD from stormwater outlets after the construction of the treatment facilities.

Policy, general governance and design targets

Policy description:

1) reduction of formation and collection of stormwater; 2) reduction of the amounts of stormwater, centrally discharged into the environment; 3) reduction of pollution levels in stormwater; 4) ensure that stormwater is managed separately form domestic, industrial.

Part of wider plan:

Policy pressure:

Policy requirement directive:

Policy impact:

Policy wider plan:

Wider plan type	Wider plan focus	Name	Comments
		Kretinga town special plan	Local scale plan, including all the town focuses

Policy area:

Policy target:

Target purpose
Runoff control
Peak-flow reduction
Pollutants Removal
Oher Societal Benefits

Design & implementations

Application scale:

City

Installation date:

2013

Area (ha):

Area subject to Land use change or Management/Practice change (ha):

Size:

100

Size unit:

Max water retention capacity:

0,0399999991059303

Max water retention capacity unit:

m3/sec

Basis of design:

Planned water retention time in the ponds is ~ 48 hours; under heavy rains, the time can be ~ 24 hours.

Constraints:

1) some planning constrains regardin local cultural ceritage, but problem solved; 2) there were some problems with planning paths for leasure zone near retention ponds, as there are building restrictions in such wastewater treatment areas, but the problem was successfully solved.

Public consultation:

Contractural arrangements:

Design contractual arrangement:

Arrangement type	Role	Responsibility	Name	Comments
Contractual agreement	Implementation	Supporting	SWECO	Technical project
Contractual agreement	Implementation	Supporting	GreenWorks Indusrty	Construction

Design consultation activity:

Design land use change:

Design authority:

Authority type	Role	Name	Comments
Local water authority	Initiation of the measure	Kretinga town municipality
Other		Baltic Coastal Research and Planning Institute	Baltic Coastal Research and Planning Institute is a division of KlaipÄ—da university
Local water authority		Kretinga WWTP

Last updated: 12 Jan 2015 | Top

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Ecological adapted stormwater treatment in Kretinga town, Lithuania

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