Riverbank Public School Stormwater Management Report · Riverbank Public School – Stormwater...

Riverbank Public School – Stormwater Management

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Riverbank Public School

Stormwater Management Report

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Contents

Contents .................................................................................................................................................. 2

Document control .................................................................................................................................... 3

1. Introduction ......................................................................................................................................... 4

2. Existing site ......................................................................................................................................... 5

3. Proposed development ....................................................................................................................... 6

4. Flooding............................................................................................................................................... 6

5. Stormwater management .................................................................................................................... 6

6. Erosion and sediment control ............................................................................................................. 7

7. Conclusion .......................................................................................................................................... 7

Appendix A Drawings .............................................................................................................................. 8

Appendix B Calculations ......................................................................................................................... 9


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Document control

Rev No Date Revision details Approved Verified Prepared

A 25/07/17 Approved Issue CMW KEC CMW

B 23/08/17 Scheme updated to include COLA CMW KEC CMW

Copyright 2017 © Woolacotts Consulting Engineers | Do not use, copy, or reproduce wholly or in part without written permission


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1. Introduction

Riverbank Public School is an existing primary school located at the corner of Riverbank Drive and

Wentworth Street, The Ponds. Refer to Figure 1 for the location of the site. It is proposed to

construct additional buildings on the site, to provide additional learning areas and associated facilities.

This report has been prepared to address stormwater management issues associated with the

proposed works.

Figure 1 –Site Location


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2. Existing site

Riverbank Public School is located adjacent to The Ponds High School, with the primary school

located on the southern part of the site and the high school on the northern part of the site. Within the

primary school area, a grassed open play area is located in the southern corner, a parking area along

the eastern side and school buildings along the northern side. Refer to Figure 2 for an aerial photo of

the site.

The existing Public School has a piped drainage system. It drains to a 200m3 rainwater tank, located

beneath the entry forecourt, near Wentworth Street. Overflow from the tank drains to the north and

connects to the high school drainage system.

There are two detention basins located on the high school site, and stormwater from the public school

drains to Basin 2, located along the northern boundary. Refer to Figure 2 for the location of the basin.

Figure 2 – The site

Basin 2

Riverbank Public

School


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3. Proposed development

The works proposed for the site consist of new buildings containing general learning areas, toilets and

associated facilities. They will be located in the north-east corner of the public school, near

Wentworth Street. There will also be a new COLA over the existing games court and paved play

areas.

4. Flooding

Blacktown City Council has identified that a portion of the site on the northern boundary is identified

as low risk flood prone land. This is not located near the proposed works. Therefore the proposed

new buildings are not affected by flooding.

5. Stormwater management

The proposed buildings will be located on existing paved and landscaped areas, which contain an

existing stormwater drainage system. The existing pipes will be relocated clear of the proposed

buildings. Runoff from the new roof areas will be connected to the existing rainwater tank. The new

COLA will be located over existing paved areas and downpipes from the COLA will connect to the

existing drainage system.

The existing stormwater system currently drains to a detention basin, located on the northern

boundary of the high school, which has a volume of 975m3. Refer to Appendix A for the design

drawing of the basin. (The basin was called Basin 2 in the original design.) This basin has been

designed for runoff from the public school and part of the high school and has a catchment area of

32,000m2, of which approximately 15,700m3 is impervious. With the proposed works, the impervious

area in the catchment will increase to 16,500m2.

The existing basin was modelled using XP-Rafts, to assess the impact of the increase in impervious

area on the basin. The analysis showed that while there was a minor increase in water levels (less

than 10mm), the peak outflow from the basin did not change for a range of recurrence intervals, from

a 5 year AEP to a 100 year AEP. Therefore, no changes are required to the basin, and it provides the

detention required for the site. For further details regarding the analysis, refer to the calculation in

Appendix B.

The site currently contains a suite of water quality improvement measures including:

A bio-retention basin combined with the OSD basin

A 200m3 rainwater tank, used to provide irrigation water throughout the site.

Vegetated swales along parking areas

Enviropod inserts in grated inlet pits


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The proposed works will result in the demolition of some of the existing swales and a portion of

raingarden. A new raingarden will be provided to replace the swales and provide treatment to the

new paved areas. Envirpod inserts will be provided in all new grated inlet pits.

The existing rainwater tank will be retained, with the new roof areas draining to the tank. This will

allow water from the tank to be used to flush toilets associated with the new works.

The proposed works are all located within the catchment of the existing bio-retention basin, which has

been sized to cater for the total catchment area. While there is an increase in impervious area, it is

minor compared with the total catchment and will not negatively impact the bio-retention basin. In

additional, all new roof area will drain to the rainwater tank for non-potable uses throughout the

school, reducing the volume draining directly to the bio-retention basin. Due to these considerations

and with the additional measures provided such as enviropod inserts in new pits, a Music analysis

has not been undertaken as we believe the quality objectives have not been compromised by the

works.

For further details of the stormwater drainage works associated with the proposed works, refer to

Drawing SW1 in Appendix A.

6. Erosion and sediment control

During construction, erosion and sediment control measures will be provided in accordance with the

“Blue Book” (Managing Urban Stormwater – Soils and Construction). Measures will include silt

fences on the low side of the works and construction exits for vehicles.

7. Conclusion

The works proposed for the site are an expansion of the existing public school. The existing

stormwater pipes will be diverted around the proposed new buildings. Runoff from new roofs will be

connected to the existing rainwater tank.

The existing detention basin on the high school site (known as Basin 2) has capacity to cater for the

increased impervious area on site. No changes are required to the basin.

In addition to using water from the existing rainwater tank to flush toilets, WSUD and water quality

improvement measures will be modified and increased as part of the new works. A new raingarden

will be provided, to replace lost swales and raingarden and enviropods provided in new pits. The

existing bio-retention basin formed as part of detention basin 2 will be retained and will not be affected

by the increase in impervious area.

Blacktown City Council has identified that a portion of the site on the northern boundary is identified

as low risk flood prone land. This is not located near the proposed works.

Erosion and sediment control measures will be provided in accordance with the “Blue Book”

(Managing Urban Stormwater – Soils and Construction)


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Appendix A

Drawings


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Appendix B

Calculations

Riverbank PS – Rafts Results 18 July 2017

16-257 Page: 1

EXISTING SITE AND DETENTION BASIN

Run started at: 18th July 2017 12:18:52

#####################################################################################

RUNTIME RESULTS

#####################################################################################

Max. no. of links allowed = 10000

Max. no. of routng increments allowed = 99999

Max. no. of rating curve points = 99999

Max. no. of storm temporal points = 99999

Max. no. of channel subreaches = 25

Max link stack level = 50

Input Version number = 821

#####################################################################################

Riverbank PS - Existing basin

Results for period from 0: 0.0 1/ 1/1990

to 1:40.0 1/ 1/1990

#####################################################################################

ROUTING INCREMENT (MINS) = 1.00

STORM DURATION (MINS) = 10.

RETURN PERIOD (YRS) = 5.

BX = 1.0000

TOTAL OF FIRST SUB-AREAS (ha) = 1.63

TOTAL OF SECOND SUB-AREAS (ha) = 1.57

TOTAL OF ALL SUB-AREAS (ha) = 3.20

SUMMARY OF CATCHMENT AND RAINFALL DATA

Link Catch. Area Slope % Impervious Pern B Link

Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000

Link Average Init. Loss Cont. Loss Excess Rain Peak Time Link

Label Intensity #1 #2 #1 #2 #1 #2 Inflow to Lag

(mm/h) ( mm ) (mm/h) ( mm ) (m^3/s) Peak mins

Basin2 98.135 10.00 2.000 2.500 0.000 6.147 14.356 0.5190 4.000 0.000

SUMMARY OF BASIN RESULTS

Link Time Peak Time Peak Total --------- Basin ---------

Label to Inflow to Outflow Inflow Vol.(m^3) Vol.(m^3) Stage

Peak (m^3/s) Peak (m^3/s) (m^3) Avail Used Used (m)

Basin2 4.000 .5190 11.00 .2860 321.71 0.0000 69.305 52.642

SUMMARY OF BASIN OUTLET RESULTS

Link No. S/D Dia Width Pipe Pipe

Label of Factor Length Slope

(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 1:40.0 1/ 1/1990

#####################################################################################





16-257 Page: 2

BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 127.40 10.00 2.000 2.500 0.000 10.984 19.234 0.6767 3.000 0.000





Basin2 3.000 .6767 11.00 .2907 475.85 0.0000 147.22 52.690




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 1:40.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 165.80 10.00 2.000 2.500 0.000 17.342 25.634 0.8468 10.00 0.000





Basin2 10.00 .8468 12.00 .2978 678.22 0.0000 267.87 52.764



16-257 Page: 3



(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 2:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 81.850 10.00 2.000 2.500 0.000 10.087 18.462 0.5792 10.00 0.000





Basin2 10.00 .5792 12.00 .2873 451.73 0.0000 90.579 52.655




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 2:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000


16-257 Page: 4




Basin2 106.17 10.00 2.000 2.500 0.000 16.125 24.542 0.7943 10.00 0.000





Basin2 10.00 .7943 16.00 .2939 645.06 0.0000 200.56 52.723




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 2:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 138.06 10.00 2.000 2.500 0.000 24.057 32.516 1.030 10.00 0.000





Basin2 10.00 1.029 18.00 .3040 898.79 0.0000 373.49 52.829




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 3:20.0 1/ 1/1990


16-257 Page: 5

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 71.209 10.00 2.000 2.500 0.000 13.195 21.736 0.5593 10.00 0.000





Basin2 10.00 .5593 17.00 .2893 554.23 0.0000 123.55 52.675




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 3:20.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 92.303 10.00 2.000 2.500 0.000 20.184 28.768 0.7625 10.00 0.000




16-257 Page: 6



Basin2 10.00 .7625 21.00 .2973 778.08 0.0000 258.73 52.759




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 3:20.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 119.96 10.00 2.000 2.500 0.000 29.363 37.988 0.9676 10.00 0.000





Basin2 10.00 .9676 24.00 .3100 1071.9 0.0000 480.12 52.895




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 4:10.0 1/ 1/1990

#####################################################################################




BX = 1.0000





16-257 Page: 7



Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 63.562 10.00 2.000 2.500 0.000 15.776 24.484 0.6494 15.00 0.000





Basin2 15.00 .6494 17.00 .2895 639.61 0.0000 128.06 52.678




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 4:10.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 82.345 10.00 2.000 2.500 0.000 23.560 32.310 0.9056 15.00 0.000





Basin2 15.00 .9056 26.00 .2997 888.95 0.0000 299.70 52.784




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000


16-257 Page: 8

#####################################################################################



to 4:10.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 106.97 10.00 2.000 2.500 0.000 33.738 42.572 1.129 15.00 0.000





Basin2 15.00 1.129 28.00 .3141 1215.6 0.0000 553.38 52.940




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 5: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 57.734 10.00 2.000 2.500 0.000 17.950 26.867 0.5960 15.00 0.000


16-257 Page: 9





Basin2 15.00 .5960 27.00 .2888 712.61 0.0000 116.49 52.671




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 5: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 74.760 10.00 2.000 2.500 0.000 26.422 35.380 0.8328 15.00 0.000





Basin2 15.00 .8328 31.00 .3011 983.94 0.0000 322.94 52.798




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 5: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000


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Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 97.080 10.00 2.000 2.500 0.000 37.498 46.540 1.052 15.00 0.000





Basin2 15.00 1.052 32.00 .3171 1338.7 0.0000 607.33 52.974




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 7:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 46.176 10.00 2.000 2.500 0.000 23.255 32.632 0.4756 15.00 0.000





Basin2 15.00 .4756 37.00 .2901 889.50 0.0000 137.47 52.684




16-257 Page: 11


(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 7:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 59.729 10.00 2.000 2.500 0.000 33.338 42.797 0.6539 15.00 0.000





Basin2 15.00 .6539 41.00 .3048 1213.2 0.0000 387.83 52.838




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 7:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000


16-257 Page: 12




Basin2 77.490 10.00 2.000 2.500 0.000 46.617 56.117 0.8507 15.00 0.000





Basin2 15.00 .8507 45.00 .3236 1638.3 0.0000 726.85 53.047




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 10: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 39.145 10.00 2.000 2.500 0.000 27.228 37.145 0.6185 25.00 0.000





Basin2 25.00 .6185 42.00 .2926 1025.5 0.0000 179.59 52.710




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 10: 0.0 1/ 1/1990

#####################################################################################


16-257 Page: 13




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 50.593 10.00 2.000 2.500 0.000 38.593 48.593 0.8698 25.00 0.000





Basin2 25.00 .8698 46.00 .3081 1390.0 0.0000 445.59 52.874




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 10: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 65.593 10.00 2.000 2.500 0.000 53.551 63.593 1.141 25.00 0.000





16-257 Page: 14


Basin2 25.00 1.140 50.00 .3267 1868.7 0.0000 783.49 53.082




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 15: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 30.873 10.00 2.000 2.500 0.000 33.143 44.310 0.7203 30.00 0.000





Basin2 30.00 .7203 44.00 .2922 1234.3 0.0000 173.17 52.706




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 15: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000





16-257 Page: 15



Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 39.929 10.00 2.000 2.500 0.000 46.643 57.893 1.003 30.00 0.000





Basin2 30.00 1.003 47.00 .3082 1667.1 0.0000 447.19 52.875




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 15: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 51.795 10.00 2.000 2.500 0.000 64.401 75.693 1.276 30.00 0.000





Basin2 30.00 1.276 57.00 .3273 2235.5 0.0000 794.54 53.089




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################


16-257 Page: 16



to 20: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 25.997 10.00 2.000 2.500 0.000 37.869 49.994 0.6387 35.00 0.000





Basin2 35.00 .6387 50.00 .2945 1400.0 0.0000 210.38 52.729




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 20: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 33.638 10.00 2.000 2.500 0.000 53.068 65.276 0.8971 35.00 0.000


16-257 Page: 17





Basin2 35.00 .8971 62.00 .3085 1887.8 0.0000 452.53 52.878




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 20: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 43.653 10.00 2.000 2.500 0.000 72.931 85.306 1.155 35.00 0.000





Basin2 35.00 1.155 66.00 .3275 2525.9 0.0000 798.90 53.092




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 6: 0.0 2/ 1/1990

#####################################################################################




BX = 1.0000


16-257 Page: 18






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 20.347 10.00 2.000 2.500 0.000 44.541 59.041 0.4675 45.00 0.000





Basin2 45.00 .4675 48.00 .2874 1651.4 0.0000 93.570 52.657




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 6: 0.0 2/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 26.345 10.00 2.000 2.500 0.000 62.411 77.036 0.6479 45.00 0.000





Basin2 45.00 .6479 76.00 .3000 2224.9 0.0000 304.73 52.787




16-257 Page: 19


(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 6: 0.0 2/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.632 1.568 2.000 2.000 0.000 100.0 .025 .015 .0237 .0013 1.000




Basin2 34.209 10.00 2.000 2.500 0.000 85.876 100.63 0.8098 45.00 0.000





Basin2 45.00 .8098 81.00 .3186 2977.4 0.0000 634.84 52.990




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

Run completed at: 18th July 2017 12:18:54

PROPOSED IMPERVIOUS AREA AND EXISTING DETENTION BASIN

Run started at: 18th July 2017 13:19:45

#####################################################################################

RUNTIME RESULTS

#####################################################################################

Max. no. of links allowed = 10000

Max. no. of routng increments allowed = 99999

Max. no. of rating curve points = 99999

Max. no. of storm temporal points = 99999

Max. no. of channel subreaches = 25

Max link stack level = 50

Input Version number = 821

#####################################################################################

Riverbank PS - Existing basin - Proposed development



16-257 Page: 20

to 1:40.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 98.135 10.00 2.000 2.500 0.000 6.147 14.356 0.5515 4.000 0.000





Basin2 4.000 .5515 11.00 .2867 329.92 0.0000 81.584 52.650




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 1:40.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 127.40 10.00 2.000 2.500 0.000 10.984 19.234 0.7155 3.000 0.000



16-257 Page: 21




Basin2 3.000 .7155 11.00 .2917 484.15 0.0000 163.47 52.700




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 1:40.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 165.80 10.00 2.000 2.500 0.000 17.342 25.634 0.8948 3.000 0.000





Basin2 3.000 .8948 12.00 .2991 686.53 0.0000 289.44 52.778




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 2:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000





16-257 Page: 22



Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 81.850 10.00 2.000 2.500 0.000 10.087 18.462 0.6103 10.00 0.000





Basin2 10.00 .6103 12.00 .2881 459.95 0.0000 103.85 52.663




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 2:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 106.17 10.00 2.000 2.500 0.000 16.125 24.542 0.8329 10.00 0.000





Basin2 10.00 .8329 16.00 .2950 653.35 0.0000 220.12 52.735




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000


16-257 Page: 23

#####################################################################################



to 2:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 138.06 10.00 2.000 2.500 0.000 24.057 32.516 1.074 10.00 0.000





Basin2 10.00 1.074 18.00 .3053 907.14 0.0000 397.00 52.844




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 3:20.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000





16-257 Page: 24

Basin2 71.209 10.00 2.000 2.500 0.000 13.195 21.736 0.5909 10.00 0.000





Basin2 10.00 .5909 17.00 .2902 562.55 0.0000 139.36 52.685




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 3:20.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 92.303 10.00 2.000 2.500 0.000 20.184 28.768 0.8024 10.00 0.000





Basin2 10.00 .8024 21.00 .2985 786.47 0.0000 278.83 52.771




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 3:20.0 1/ 1/1990

#####################################################################################




16-257 Page: 25


BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 119.96 10.00 2.000 2.500 0.000 29.363 37.988 1.014 10.00 0.000





Basin2 10.00 1.014 23.00 .3113 1080.4 0.0000 503.07 52.909




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 4:10.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 63.562 10.00 2.000 2.500 0.000 15.776 24.484 0.6781 15.00 0.000





Basin2 15.00 .6781 17.00 .2905 648.07 0.0000 144.57 52.688



16-257 Page: 26



(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 4:10.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 82.345 10.00 2.000 2.500 0.000 23.560 32.310 0.9403 15.00 0.000





Basin2 15.00 .9403 26.00 .3008 897.49 0.0000 319.18 52.796




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 4:10.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)


16-257 Page: 27

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 106.97 10.00 2.000 2.500 0.000 33.738 42.572 1.167 15.00 0.000





Basin2 15.00 1.166 27.00 .3154 1224.2 0.0000 575.68 52.954




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 5: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 57.734 10.00 2.000 2.500 0.000 17.950 26.867 0.6226 15.00 0.000





Basin2 15.00 .6226 26.00 .2898 721.25 0.0000 133.11 52.681




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################




16-257 Page: 28

to 5: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 74.760 10.00 2.000 2.500 0.000 26.422 35.380 0.8649 15.00 0.000





Basin2 15.00 .8649 31.00 .3021 992.65 0.0000 341.64 52.810




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 5: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 97.080 10.00 2.000 2.500 0.000 37.498 46.540 1.087 15.00 0.000



16-257 Page: 29




Basin2 15.00 1.087 32.00 .3183 1347.5 0.0000 628.43 52.987




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 7:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 46.176 10.00 2.000 2.500 0.000 23.255 32.632 0.5018 15.00 0.000





Basin2 15.00 .5018 37.00 .2910 898.58 0.0000 152.53 52.693




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 7:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000





16-257 Page: 30



Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 59.729 10.00 2.000 2.500 0.000 33.338 42.797 0.6863 15.00 0.000





Basin2 15.00 .6863 41.00 .3058 1222.4 0.0000 406.00 52.849




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 7:30.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 77.490 10.00 2.000 2.500 0.000 46.617 56.117 0.8885 15.00 0.000





Basin2 15.00 .8885 45.00 .3246 1647.5 0.0000 744.69 53.058




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000


16-257 Page: 31

#####################################################################################



to 10: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 39.145 10.00 2.000 2.500 0.000 27.228 37.145 0.6418 25.00 0.000





Basin2 25.00 .6418 41.00 .2936 1035.0 0.0000 195.87 52.720




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 10: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




16-257 Page: 32


Basin2 50.593 10.00 2.000 2.500 0.000 38.593 48.593 0.8970 25.00 0.000





Basin2 25.00 .8970 46.00 .3090 1399.7 0.0000 460.99 52.883




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 10: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 65.593 10.00 2.000 2.500 0.000 53.551 63.593 1.170 25.00 0.000





Basin2 25.00 1.169 49.00 .3275 1878.5 0.0000 798.37 53.091




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 15: 0.0 1/ 1/1990

#####################################################################################



16-257 Page: 33



BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 30.873 10.00 2.000 2.500 0.000 33.143 44.310 0.7426 30.00 0.000





Basin2 30.00 .7426 43.00 .2932 1245.1 0.0000 189.24 52.716




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 15: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 39.929 10.00 2.000 2.500 0.000 46.643 57.893 1.028 30.00 0.000





Basin2 30.00 1.028 47.00 .3091 1678.0 0.0000 463.30 52.885


16-257 Page: 34




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 15: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 51.795 10.00 2.000 2.500 0.000 64.401 75.693 1.302 30.00 0.000





Basin2 30.00 1.301 57.00 .3280 2246.5 0.0000 808.28 53.097




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 20: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.


16-257 Page: 35

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 25.997 10.00 2.000 2.500 0.000 37.869 49.994 0.6626 35.00 0.000





Basin2 35.00 .6626 49.00 .2949 1411.8 0.0000 218.52 52.734




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 20: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 33.638 10.00 2.000 2.500 0.000 53.068 65.276 0.9249 35.00 0.000





Basin2 35.00 .9249 61.00 .3090 1899.6 0.0000 461.92 52.884




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



16-257 Page: 36


to 20: 0.0 1/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 43.653 10.00 2.000 2.500 0.000 72.931 85.306 1.185 35.00 0.000





Basin2 35.00 1.184 66.00 .3280 2537.9 0.0000 807.78 53.097




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 6: 0.0 2/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 20.347 10.00 2.000 2.500 0.000 44.541 59.041 0.4746 45.00 0.000



16-257 Page: 37




Basin2 45.00 .4746 48.00 .2880 1665.4 0.0000 102.83 52.663




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 6: 0.0 2/ 1/1990

#####################################################################################




BX = 1.0000






Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 26.345 10.00 2.000 2.500 0.000 62.411 77.036 0.6537 45.00 0.000





Basin2 45.00 .6537 76.00 .3004 2239.0 0.0000 311.62 52.791




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

#####################################################################################



to 6: 0.0 2/ 1/1990

#####################################################################################




BX = 1.0000



16-257 Page: 38





Label #1 #2 #1 #2 #1 #2 #1 #2 #1 #2 No.

(ha) (%) (%)

Basin2 1.536 1.664 2.000 2.000 0.000 100.0 .025 .015 .0230 .0014 1.000




Basin2 34.209 10.00 2.000 2.500 0.000 85.876 100.63 0.8142 45.00 0.000





Basin2 45.00 .8142 80.00 .3194 2991.6 0.0000 648.84 52.999




(m) (m) (m) (m) (%)

Basin2 1.0 .3700 0.000 99999. 5.000

Run completed at: 18th July 2017 13:19:46

Riverbank Public School Stormwater Management Report · Riverbank Public School – Stormwater...

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