PODGORCA AIRPORT RECONSTRUCTION PROJECT

THE NEW APPROACH FOR APRON DRAINAGE

SYSTEM

Scheme of a new drainage system

RS5 32.6230.72

P6

A2

PutRS1 32.5230.92

RS2 32.5430.89

RS3 32.5630.84

RS4 32.5930.78

? 700 conc

? 500 conc

? 600 conc

Rainfall intensity and durationfor return period of 2 years

Duration in min Rain intensity ATKINS AEROINZENEJRING

  l/s/ha mm/h l/s/ha mm/h

5 361 130 267  96

6 330 118    

7 300 108    

8 280 100    

9 265 95    

10 251 90 250 90

20     196 70.5

30     158 570

50

100

150

200

250

300

350

400

ATKINS AEROINŽENJERING

ATKINS 361 330 300 280 265 251

AEROINŽENJERING 267 262 258 255 252 250 196 158

5 6 7 8 9 10 20 30

Scheme for left side drainage system

1S

A1-1

2R

D1-1 300/300

3S

A1-2

4R

D1-2 300/300

5S

A2

6R

d2 500/300

7S

A3

8R

D3 600/300

9R

betonska cev 600

10R

D6 600/300

11S

A6-1

12R

d62 600/300

13S

A6-2

14R

d5 500/300

15S

A5

16R

d4 400/300

17P

separator

17S

A4

Runoff

Hydrograph

Time (hours)0.40.350.30.250.20.150.10.050

Flo

w (

mł/s

)

0.035

0.03

0.025

0.02

0.015

0.01

0.005

0

RainfallDuration=5 min,Inten=130 mm/hr

Runoff Area=0.0966 haRunoff Volume=0.010 Ml

Runoff Depth=11 mmFlow Length=50.0 m

Tc=1.3 minC=1.00

0.0349 mł/s

InflowOutflow

Hydrograph

Time (hours)0.40.350.30.250.20.150.10.050

Flo

w (

mł/s

)

0.035

0.03

0.025

0.02

0.015

0.01

0.005

0

Inflow Area=0.0966 haPeak Depth=0.14 m

Max Vel=1.24 m/sn=0.011

L=30.00 mS=0.0053 m/m

Capacity=0.0870 mł/s

0.0349 mł/s0.0349 mł/s

HYDROGRAPH FOR RAIN DURATION 5 minIN LEFT OIL SEPARATOR Q=20 l/s

Inf lowOutflowPrimarySecondary

Hydrograph

Time (hours)0.40.350.30.250.20.150.10.050

Flo

w (

mł/s

)

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

Inflow Area=1.9697 haPeak Elev=30.955 m

Storage=0.071 Ml

0.6575 mł/s0.6282 mł/s0.6082 mł/s

0.0200 mł/s

Inf lowOutflowPrimarySecondary

Hydrograph

Time (hours)0.40.350.30.250.20.150.10.050

Flo

w (

mł/s

)

0.6

0.5

0.4

0.3

0.2

0.1

0

Inflow Area=1.9697 haPeak Elev=30.850 m

Storage=0.070 Ml

0.5832 mł/s0.5773 mł/s0.5573 mł/s

0.0200 mł/s

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

InflowOutflowPrimarySecondary

Hydrograph

Time (hours)0.40.350.30.250.20.150.10.050

Flo

w (

mł/s

)

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=1.9697 haPeak Elev=30.695 m

Storage=0.067 Ml

0.4924 mł/s0.4921 mł/s0.4721 mł/s

0.0200 mł/s

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

0

50

100

150

200

250

300

350

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35

duration in h

m3

0

2

4

6

8

10

12

14

16

18

20

volume cumulative volume specific

VOLUME OF RUNNOF IN OIL SEPARATOR FOR RAINFALL DURATION OF 10 MIN MAX VOLUMEDURATION 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

Longitudinal section of detention pond of80m3, oil separator 20 l/s and by-pass

Plan view of detention pond of 80m3, oil separator 20 l/s and by-pass - left system

Scheme for the right side drainage system

1S

d7-1

3S

d7-2

5S

d8

2R

A7-1 300/300

4R

d7 400/300

7S

A9 400/300

9S

A10

6R

d8 400/300

8R

d9 500/300

10R

D10 150/150

11S

A13

13S

A14

12R

d13 300/300

14R

d14 300/300

15R

cev odvod

16S

A10

18S

A10a

20S

A10b

17R

d10 300/300

19R

d10a 400/300

22S

A10c

21R

d10b 400/300

23R

d10b 500/300

24R

cev 500

25R

cev 500

30S

A11

26R

cev 500

27R

cev 600

28R

cev 700

29P

separator 2

HYDROGRAPH FOR RAIN DURATION OF 7 minIN THE RIGHT SYSTEM OIL SEPARATOR Q=20 l/s

Inf lowPrimary

Hydrograph

Time (hours)0.250.20.150.10.050

Flo

w (

mł/s

)

0.550.5

0.450.4

0.350.3

0.250.2

0.150.1

0.050

Inflow Area=1.8235 haPeak Elev =30.206 m

Storage=0.059 Ml

0.5327 mł/s0.5103 mł/s

HYDROGRAPH FOR RAIN DURATION OF 10 minIN THE RIGHT SYSTEM OIL SEPARATOR Q=20 l/s

InflowPrimary

Hydrograph

Time (hours)0.40.350.30.250.20.150.10.050

Flo

w (

mł/s

)

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=1.8235 haPeak Elev =30.005 m

Storage=0.056 Ml

0.4558 mł/s0.4532 mł/s

HYDROGRAPH FOR RAIN DURATION OF 5 minIN THE RIGHT SYSTEM OIL SEPARATOR Q=20 l/s

InflowPrimary

Hydrograph

Time (hours)0.250.20.150.10.050

Flo

w (

mł/s

)

0.6

0.5

0.4

0.3

0.2

0.1

0

Inflow Area=1.8235 haPeak Elev =30.321 m

Storage=0.061 Ml

0.5802 mł/s0.5399 mł/s

VOLUME OD RUNNOFF VOLUME IN THE RIGHT SYSTEM OIL SEPARATOR FOR RAIN DURATION OF 10 MIN AND 260m3, DURATION OF FIRST FLUSH OF APPR 6 MIN ANDVOLUME OF THE FIRST FLUSH OF 78m3

0

50

100

150

200

250

300

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35

duration in h

m3

0

2

4

6

8

10

12

14

16

18

volume cumulative volume specific

0.45 m3/s

COMPARATIONATKINS AEROINŽENJERING

OIL SEPARATORS at 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 m2, 30 m3 10 m2, 2.5 m3

Excavation 600 m3 440 m3

Superstructure, ponds,

none 60 m3, 6 tone of reinforcement

Equipment 2 pumps FLYGT 5 m, 10 l/s and 2 kW, d. c. i. of 2 tones

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.