Meeting of the EG on Water Scarcity & Droughts, Budapest The State Water- Resource Balance of Slovak Republic Poorova, J., Danacova, Z., Skoda, P, Magulova, R. 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Present water engineering problems (1) Water Sources Water Demand < Z = P > 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Present water engineering problems (2) Adaptation water resources distribution in time and space toward water demand distribution in time and space. Water economy issue in non - homogeneity conditions - the quantification and qualification of hydrological process changes. 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest About Slovak rep. A = 49 014 km2 Z = 761 mm OSR =262 mm (410 m3.s-1) Inflow: 2135 m3.s-1 outflow: 2550 m3.s-1 11 RB (10 DRB, 1 VRB) WR : 20 (1472,5mio.m3) WT: 7 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

The State Water-Resource Balance of Slovak Republic (SWRB) to know the quantitative balance state of surface water resources, to evaluate the water resources exploitation, to explore the relationship water demand versus water resources, provide the basic information for planning in Slovak Republic, 1975, 137 profiles 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Water Balance Water - Resource Balance (VHB) Hydrological Balance Water - Resource balance on surface water quantity ( previous year) Water - Resource balance on surface water quality ( previous year) Water - Resource balance on ground water quantity ( previous year) Water - Resource balance on ground water quality ( previous year) Report on Water - Resource balance for previous year Report on Water - Resource balance for Development Plan Water Balance Hydrological Balance 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Water Sources Water Demand MPP = MQ - X Minimum balance discharge MQ Natural available SW water resources C = E – effects E – Effected discharge (real measured) N – Sum of Effects of Artificial Water Storage Reservoirs P - Sum of Effects of Artificial Water Transfers X – Discharge change X = V – (PO+PZO) PO - Sum of SW abstractions PZO - Sum of GW abstractions V - Sum of discharge water X – Sum of Effects of W utilization < Z = P > Effects: Available SW water resources ENP = C +N+P 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest Sum of Effects of W utilization GW abstractions discharge water SW abstractions 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

(Quantitative) Balance status BSC = Z / P BSC = C / MQ-X BSENP = ENP/ MQ-X BSC (BSENP) > 1,1 good 1,1 > BSC (BSENP) > 0,9 tense 0,9 > BSC (BSENP) > 0 negative 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

MQ, Exceed Frequency – method in SR The exceed frequency of flow is given in terms of days, Mean daily discharge equal or exceeded in M days Reference time period: 61 – 2000, (1931 – 80), M -days 30 90 180 270 355 364 P % 8,2 24,6 49,3 73,9 97,2 99,7 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Cumulative frequency curve 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Some examples of results Slana River Basin, P=3217km2 Z = 712 mm O = 189 mm (19,36 m3.s-1) Number of Profiles: 14 Number of WR: 2 (13,712 mil.m3) Number of water transfer: 1 (0,5 – 1,6 m3.s-1) Qa = 19,36 m3.s-1 MQ = 2,150 m3.s-1 Q355, uzáver = 3,618 m3.s-1 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Natural available SW resources 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Water utilization (1) - number 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Water utilization (2) - quantity 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Runoff distribution - annual 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Priority: To ensure drinking water supply: Extraordinary measures: 24.5. 1993 – 26.1.1994 !!!!: Changes in performance of abstraction (cut-down,..) Regulated abstraction from reservoir for users, (time restrictions, amount restriction, Prohibitions (water the gardens, car washing, ...) 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

(Quantitative) Balance status 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Index on Water Scarcity Rws = W/Q (Taikan, O. et al, 2003) where: W – sum of annual abstractions, alt. water demand Q – annual available water resources. Rws < 0,1 no water scarcity 0,1 < Rws < 0,2 low 0,2 < Rws < 0,4 moderate (tense) 0,4 < Rws significant 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest Porovnanie indexu nedostatku vody a bilančného stavu BSC sme urobili nasledovným spôsobom:

Meeting of the EG on Water Scarcity & Droughts, Budapest Index Water Demand Water Sources < P = Z > natural WR (C) available (ENP) Guaranteed Q (MQ) Utilization, 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Index - Minimum balance discharge 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest Index - Utilization (1) 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest Index - Utilization (2) 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest Index no water scarcity Low moderate (tense) Significant No water 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest Conclusions Permanent monitoring, (alert system) Permissions (evidence, performance,..) Real utilization, (regular and controlled evidence, system of collection is necessary, regular and controlled,..) „suitable“ and „sustainable“ limits of guaranteed WR (ecological?, to solve utilization? make them more restrictive? 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest

Meeting of the EG on Water Scarcity & Droughts, Budapest Thank for your attention: jana.poorova@shmu.sk zuzana.danacova@shmu.sk peter.skoda@shmu.sk renata.magulova@enviro.gov.sk 31 March - 1 April 2011 Meeting of the EG on Water Scarcity & Droughts, Budapest