Stormwater management practice in Lithuanian
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1 Stormwater management practice in Lithuanian Dr. Mindaugas Rimeika, VGTU Rimantas Kupliauskas, Grinda Ltd BALTIC WATER WORKS CONFERENCE
2 Human created problem Krituliai Natural territories: 80% rainfall infiltrate to ground 20% runoff flows to water bodies Nuteka 20% Įsigeria 80% Urbanized territories: 80% runoff flows to water bodies 20% rainfall infiltrate to ground Krituliai Nuteka 80% Įsigeria 20%
3 Cities after heavy rains (separate system)
4 Tasks of stormwater managements Collect and discharged runoff as fast as possible, in order to avoid flooding of cities. Treat stormwater runoff before discharge to water bodies.
5 Sewer systems Combined system: mixture of domestic and stormwater discharged to recipients. Separate system: stormwater was discharged directly to the receiving waters. Problems in both cases pollution of receiving waters.
6 Separate sewer systems 6
7 Everything starting from single house 7
8 Suspended solids in urban storm water runoff (one city) Skendinčios medžiagos, mg/l Išleistuvas 1 (Maironio) Išleistuvas 1' (Dailidės) Išleistuvas 2 (Upelio) Išleistuvas 3 (Sanatorijos) Išleistuvas 4 (Artojų) Išleistuvas 5' Išleistuvas 5'' Išleistuvas 6 (Valymo įrenginių) Išleistuvas 7 (Pievų) Išleistuvas 8 (AB "Alkesta") Išleistuvas 9 (Vandentiekio stoties Nr.2) Išleistuvas 10 (Žemaitės) measurements 12 below norm (6%) 30 mg/l
9 Total petroleum hydrocarbons in urban storm water runoff 10 9 Naftos produktai, mg/l Išleistuvas 1 (Maironio) Išleistuvas 1' (Dailidės) Išleistuvas 2 (Upelio) Išleistuvas 3 (Sanatorijos) Išleistuvas 4 (Artojų) Išleistuvas 5' Išleistuvas 5'' Išleistuvas 6 (Valymo įrenginių) Išleistuvas 7 (Pievų) Išleistuvas 8 (AB "Alkesta") Išleistuvas 9 (Vandentiekio stoties Nr. 2) Išleistuvas 10 (Žemaitės) measurements, 194 below norm (96%) 5 mg/l
10 BOD 7 in urban storm water runoff BDS7, mg/l Išleistuvas 1 (Maironio) Išleistuvas 1' (Dailidės) Išleistuvas 2 (Upelio) Išleistuvas 3 (Sanatorijos) Išleistuvas 4 (Artojų) Išleistuvas 5' Išleistuvas 5'' Išleistuvas 6 (Valymo įrenginių) Išleistuvas 7 (Pievų) Išleistuvas 8 (AB "Alkesta") Išleistuvas 9 (Vandentiekio stoties Nr.2) Išleistuvas 10 (Žemaitės) 202 measurements, 151 below norm (75%) 25 mg/l 10
11 First flush First flush phenomena - about 30% of runoff volume consist about 80% of pollutants. However first flush could be observed on relatively small catchment.
12 Flow, l/s SS, mg/l Flow pollution relation Time, h
13 Typical Lithuanian values Parameters ph SS COD BOD 7 Oil mg/l mg/l mg O 2 /l mg/l Average value 7, ,1 Max ,8 Min 7, ,76 Snow melt runoff has 1,5 higher SS concentration and high chloride level ( mg/l).
14 Lithuanian requirements for stormwater runoff effluents (2007) SS 30 mg/l average annual and 50 mg/l maximum; Oil - 5 mg/l average annual and 7 mg/l maximum; BDS 5-25 mg/l average annual and 50 mg/l maximum; Chloride 1000 mg/l maximum; Sulfate 300 mg/l maximum;
15 Lithuanian requirements All effluents bigger than 100 mm diameter shall be registered and monitored; From each effluent shall be taken samples 4 time per year; All catchments bigger than 10 ha shall have flow measuring units; Industrial and specific pollution sites shall have flow measuring units (independent to size);
16 Requirement's of treatment facilities Obligatory to all catchments more than 10 ha. Any kind of industrial territory; Parking lot bigger than 0,5 ha (cars); Parking lot for more than 20 trucks; Treated shall be more than 15% of maximum calculated runoff (l/s).
17 LT situation Allowed separate sewer system only. Only three cities downtowns has combine systems. Small problems with combine sewer overflows. Wastewater treatment plant 1 unit per city. Money for stormwater management for Stormwater effluents (treatment plants): Vilnius 110 (4); Kaunas 105 (0); Klaipėda 60 (1).
18 Management schemes a) b) c) Point treatment plant Drainage basin Sewer Drainage basin treatment plant Overflow
19 Obligatory devices Flow separation Treatment Oil sensors Sampling point 19
20 Vilnius Stormwater Network (km) Total 1700 km , ,15 33,05 32, , ,03 18,94 19,33 15,78 17,36 19,07 18, ,34 6,2 8,2 10,
21 Diameter, mm Vilnius stormwater network pipelines ,8 6,1 8,6 10,9 22,9 29, ,2 60,4 41,9 66,4 137,6 197, Network length, km
22 Stormwater pipes
23 Present situation with stormwater networks Emergency 20 % 50 % 30% Unsatisfactory Satisfactory Emergency situation with 200 km of stormwater pipelines
24 Stormwater network evaluation, Vilnius 9-7 balai 5-6 balai 2-4 balai
25 Foreseen treatment plants location in Vilnius
26 Hydraulic calculations
27 General outcomes About 20 % of network has emergency status (hydraulic or structural). Some basins has 3 time increased paved area. Stormwater has treatment up to 10%, only. Almost all network has no legal status or registration. Only industrial territories paid taxes for stormwater. No money for extension and proper maintenance. Municipalities directly supporting stormwater. Water Utilities temporally operate storm water networks for 75% of cases. Long procedure with land transfer for treatment plants.
28 Implemented steps Stormwater included into water and wastewater price calculation law ( ). Special plan for Stormwater development approved for Vilnius city on Hydraulic calculation of network. Vilnius municipality approved investments for stormwater for 23 (EU) mln. Eur + 4 (Vilnius) mln. Eur. 4 networks renovations and 1 treatment plant construction (470 ha). Grinda Ltd is appointed as manager of stormwater system in Vilnius by municipality. Financing 85% money from EU and 15% municipality. For stormwater allocated 61 mln. Eur for LT from EU.
29 GENERAL LAYOUT INVESTMENT IN VILNIUS STORMWATER TREATMENT PLANTS - 5 MIL. EUR NEW NETWORKS CONSTRUCTION AND TREATMENT 25 MIL. EUR
30 NEW PARALLEL NETWORKS AND TREATMENT PLANTS FOR SUB-CATCHMENTS
31 Existing stormwater treatment plants
32 New wet pond in the city 32
33 New wet pond in the city 33
34 Stormwater Retention New developing area connecting to existing network; General role no flows from area during the peak flow; Solution is retention (infiltration) only; Often underground retention basin are used; Hypermarkets and others shall construct water retention under parking lots; Hydraulic calculation of network needed. Separation Network Inflow Retention and infiltration Outflow Inflow Retention and infiltration Outflow
35 AquaCell infiltravimo sistemos montavimas 35
36 Retention and infiltration (1)
37 Retention and infiltration (2)
38 Status Quo Discussion who shall be responsible: water supply or road repair companies??? Stormwater is not included into water tariff, still. No payment for citizens. Free dry shoos politics are continuing. About 25% of networks has not enough hydraulic capacity. Preliminary tax for industry 0,4 Eur/m 3, if no municipality fees for roads and pavement. If included about 0,15 Eur/m 3.
39 Thank you for attention
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