1. PODGORCA AIRPORT RECONSTRUCTION PROJECT THE NEW APPROACH FOR APRON DRAINAGE SYSTEM

3. Scheme of a new drainage system

4. Rainfall intensity and duration for return period of 2 years Duration in min Rain intensity ATKINSAEROINZENEJRING l/s/hamm/hl/s/hamm/h 5361130267 96 6330118 7300108 8280100 926595 102519025090 20 19670.5 30 15857

5. Scheme for left side drainage system

6. HYDROGRAPH FOR RAIN DURATION 5 min IN LEFT OIL SEPARATOR Q=20 l/s

7. HYDROGRAPH FOR RAIN DURATION OF 7 min IN THE LEFT OIL SEPARATOR Q=20 l/s

8. HYDROGRAPH FOR RAIN DURATION OF 10 min IN THE LEFT OIL SEPARATOR Q=20 l/s

10. VOLUME OF RUNNOF IN OIL SEPARATOR FOR RAINFALL DURATION OF 10 MIN MAX VOLUME DURATION OF FIRST FLUSH (POLLUTED) OF APPR 6 MIN The first wave of polluted water Retention volume to stop first wave app 80 m3 0.49 m3/s

11. Longitudinal section of detention pond of 80m3, oil separator 20 l/s and by-pass

12. Plan view of detention pond of 80m 3, oil separator 20 l/s and by-pass - left system

13. Scheme for the right side drainage system

14. HYDROGRAPH FOR RAIN DURATION OF 7 min IN THE RIGHT SYSTEM OIL SEPARATOR Q=20 l/s

15. HYDROGRAPH FOR RAIN DURATION OF 10 min IN THE RIGHT SYSTEM OIL SEPARATOR Q=20 l/s

16. HYDROGRAPH FOR RAIN DURATION OF 5 min IN THE RIGHT SYSTEM OIL SEPARATOR Q=20 l/s

17. VOLUME OD RUNNOFF VOLUME IN THE RIGHT SYSTEM OIL SEPARATOR FOR RAIN DURATION OF 10 MIN AND 260m 3, DURATION OF FIRST FLUSH OF APPR 6 MIN AND VOLUME OF THE FIRST FLUSH OF 78m 3 0.45 m3/s

19. COMPARATION ATKINSAEROINŽENJERING OIL SEPARATORSat least 5 objects of the capacity (660+590)/5 = 225 l/s, or 4 with by-pass capacity of 250 l/s Max 2 capacity of 20l/s Concrete bed of 20 cm 120 m 2, 30 m 3 10 m 2, 2.5 m 3 Excavation600 m 3 440 m 3 Superstructure, ponds, none60 m 3, 6 tone of reinforcement Equipment2 pumps FLYGT 5 m, 10 l/s and 2 kW, d. c. i. of 2 tones

20. CONCLUSION Proposed solution of the oil separator installation to be just above the ground instead of large excavation and 5 m depth of covering. Easier approach for oil suction and also silt disposal. Negligible higher expenses due to energy consumption for pollution water pumping.