Changes
On September 16, 2022 at 1:30:52 PM +1000, Lane Cove Municipal Council:
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Added resource Eastwood & Terrys Creek Floodplain Risk Management Study & Plan - Main Report October 2009 to Eastwood & Terrys Creek Floodplain Risk Management Study & Plan Main Report
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Deleted resource Eastwood & Terrys Creek Floodplain Risk Management Study & Plan - Main Report October 2009 from Eastwood & Terrys Creek Floodplain Risk Management Study & Plan Main Report
f | 1 | { | f | 1 | { |
2 | "author": "Ryde City Council", | 2 | "author": "Ryde City Council", | ||
3 | "author_email": null, | 3 | "author_email": null, | ||
4 | "contact_info": "False", | 4 | "contact_info": "False", | ||
5 | "contact_point": "cityofryde@ryde.nsw.gov.au", | 5 | "contact_point": "cityofryde@ryde.nsw.gov.au", | ||
6 | "creator_user_id": "4709c2ae-f4fb-4ac9-9b4c-a53c668db28a", | 6 | "creator_user_id": "4709c2ae-f4fb-4ac9-9b4c-a53c668db28a", | ||
7 | "data_state": "inactive", | 7 | "data_state": "inactive", | ||
8 | "extras": [ | 8 | "extras": [ | ||
9 | { | 9 | { | ||
10 | "key": "fdp_type", | 10 | "key": "fdp_type", | ||
11 | "value": "related-dataset" | 11 | "value": "related-dataset" | ||
12 | }, | 12 | }, | ||
13 | { | 13 | { | ||
14 | "key": "harvest_portal", | 14 | "key": "harvest_portal", | ||
15 | "value": "Flood Data Portal" | 15 | "value": "Flood Data Portal" | ||
16 | }, | 16 | }, | ||
17 | { | 17 | { | ||
18 | "key": "harvest_url", | 18 | "key": "harvest_url", | ||
19 | "value": | 19 | "value": | ||
20 | -creek-floodplain-risk-management-study-plan-main-report-october-2009" | 20 | -creek-floodplain-risk-management-study-plan-main-report-october-2009" | ||
21 | } | 21 | } | ||
22 | ], | 22 | ], | ||
23 | "groups": [ | 23 | "groups": [ | ||
24 | { | 24 | { | ||
25 | "description": "The function of [land and resource | 25 | "description": "The function of [land and resource | ||
26 | management](http://search.records.nsw.gov.au/functions/10) includes | 26 | management](http://search.records.nsw.gov.au/functions/10) includes | ||
27 | the administration of crown land and the process of alienation, | 27 | the administration of crown land and the process of alienation, | ||
28 | including surveying, mapping, and the preparation of leases and | 28 | including surveying, mapping, and the preparation of leases and | ||
29 | titles. The function also includes the zoning of land for a variety of | 29 | titles. The function also includes the zoning of land for a variety of | ||
30 | purposes (residential, commercial, agricultural, mining, native title, | 30 | purposes (residential, commercial, agricultural, mining, native title, | ||
31 | parks and gardens, etc.) and the siting of major projects such as the | 31 | parks and gardens, etc.) and the siting of major projects such as the | ||
32 | Darling Harbour Authority. \r\n\r\nThe term also covers the management | 32 | Darling Harbour Authority. \r\n\r\nThe term also covers the management | ||
33 | of resources such as water, soil and forests with the aim of ensuring | 33 | of resources such as water, soil and forests with the aim of ensuring | ||
34 | that exploitation and use are balanced by policies and practices aimed | 34 | that exploitation and use are balanced by policies and practices aimed | ||
35 | at sustaining and preserving the resource for future generations.", | 35 | at sustaining and preserving the resource for future generations.", | ||
36 | "display_name": "Land and Resource Management", | 36 | "display_name": "Land and Resource Management", | ||
37 | "id": "a160173c-b6d2-4696-9da9-3d3f71242672", | 37 | "id": "a160173c-b6d2-4696-9da9-3d3f71242672", | ||
38 | "image_display_url": "", | 38 | "image_display_url": "", | ||
39 | "name": "land-and-resource-management", | 39 | "name": "land-and-resource-management", | ||
40 | "title": "Land and Resource Management" | 40 | "title": "Land and Resource Management" | ||
41 | } | 41 | } | ||
42 | ], | 42 | ], | ||
43 | "id": "25a83b12-2e0b-4be8-9425-742d8621196f", | 43 | "id": "25a83b12-2e0b-4be8-9425-742d8621196f", | ||
44 | "isopen": false, | 44 | "isopen": false, | ||
45 | "jurisdiction": "New South Wales Government", | 45 | "jurisdiction": "New South Wales Government", | ||
46 | "license_id": "lsba", | 46 | "license_id": "lsba", | ||
47 | "license_title": "Licence Specified by Agency", | 47 | "license_title": "Licence Specified by Agency", | ||
48 | "likes": 0, | 48 | "likes": 0, | ||
49 | "maintainer": null, | 49 | "maintainer": null, | ||
50 | "maintainer_email": null, | 50 | "maintainer_email": null, | ||
51 | "metadata_created": "2022-02-02T22:30:35.458017", | 51 | "metadata_created": "2022-02-02T22:30:35.458017", | ||
n | 52 | "metadata_modified": "2022-09-16T00:57:29.561216", | n | 52 | "metadata_modified": "2022-09-16T03:30:52.111978", |
53 | "name": | 53 | "name": | ||
54 | creek-floodplain-risk-management-study-plan-main-report-october-2009", | 54 | creek-floodplain-risk-management-study-plan-main-report-october-2009", | ||
55 | "notes": "#Reasons for the Study and Plan\r\nFlooding problems | 55 | "notes": "#Reasons for the Study and Plan\r\nFlooding problems | ||
56 | within the Eastwood town centre and other areas within the | 56 | within the Eastwood town centre and other areas within the | ||
57 | Terry\u2019s Creek\r\ncatchment are well documented. Significant | 57 | Terry\u2019s Creek\r\ncatchment are well documented. Significant | ||
58 | flooding problems have been experienced in\r\n1967, 1984 and 1989. It | 58 | flooding problems have been experienced in\r\n1967, 1984 and 1989. It | ||
59 | is estimated that over 70 houses or commercial | 59 | is estimated that over 70 houses or commercial | ||
60 | properties\r\nexperienced above floor flooding in the November 1984 | 60 | properties\r\nexperienced above floor flooding in the November 1984 | ||
61 | flood.\r\n\r\nA range of flood mitigation options were investigated | 61 | flood.\r\n\r\nA range of flood mitigation options were investigated | ||
62 | some 17 years ago, in the Terry\u2019s\r\nCreek Catchment Management | 62 | some 17 years ago, in the Terry\u2019s\r\nCreek Catchment Management | ||
63 | Study that was prepared for the Water Board. Since that\r\ntime, there | 63 | Study that was prepared for the Water Board. Since that\r\ntime, there | ||
64 | have been a number of other studies with an emphasis largely on | 64 | have been a number of other studies with an emphasis largely on | ||
65 | structural\r\noptions, including tunnelling, as a means of reducing | 65 | structural\r\noptions, including tunnelling, as a means of reducing | ||
66 | Eastwood\u2019s flood problem. There have\r\nalso been various | 66 | Eastwood\u2019s flood problem. There have\r\nalso been various | ||
67 | planning initiatives undertaken by Council which have imposed | 67 | planning initiatives undertaken by Council which have imposed | ||
68 | restrictions\r\non development because of the flood | 68 | restrictions\r\non development because of the flood | ||
69 | problems.\r\n\r\nIn May 2006, Bewsher Consulting was commissioned by | 69 | problems.\r\n\r\nIn May 2006, Bewsher Consulting was commissioned by | ||
70 | the City of Ryde to assist its\r\nFloodplain Management Committee in | 70 | the City of Ryde to assist its\r\nFloodplain Management Committee in | ||
71 | preparing a Floodplain Management Study and Plan\r\nfor Eastwood and | 71 | preparing a Floodplain Management Study and Plan\r\nfor Eastwood and | ||
72 | Terry\u2019s Creek.\r\n#Responsibilities\r\nThe prime responsibility | 72 | Terry\u2019s Creek.\r\n#Responsibilities\r\nThe prime responsibility | ||
73 | for planning and management of flood prone lands in NSW rests\r\nwith | 73 | for planning and management of flood prone lands in NSW rests\r\nwith | ||
74 | local government. The NSW Government provides assistance on state-wide | 74 | local government. The NSW Government provides assistance on state-wide | ||
75 | policy\r\nissues and technical support. Financial assistance is also | 75 | policy\r\nissues and technical support. Financial assistance is also | ||
76 | provided to undertake flood and\r\nfloodplain risk management studies | 76 | provided to undertake flood and\r\nfloodplain risk management studies | ||
77 | and for the implementation of works identified in any\r\nsubsequent | 77 | and for the implementation of works identified in any\r\nsubsequent | ||
78 | floodplain risk management plan.\r\n\r\nThe Eastwood and Terry\u2019s | 78 | floodplain risk management plan.\r\n\r\nThe Eastwood and Terry\u2019s | ||
79 | Creek Floodplain Management Committee oversaw the Study.\r\nThis | 79 | Creek Floodplain Management Committee oversaw the Study.\r\nThis | ||
80 | committee includes Councillors and staff from the City of Ryde, and | 80 | committee includes Councillors and staff from the City of Ryde, and | ||
81 | staff from\r\nParramatta City Council, Hornsby Shire Council, | 81 | staff from\r\nParramatta City Council, Hornsby Shire Council, | ||
82 | Department of Environment, Climate\r\nChange and Water (DECCW), Sydney | 82 | Department of Environment, Climate\r\nChange and Water (DECCW), Sydney | ||
83 | Water Corporation and the State Emergency Service\r\n(SES). A number | 83 | Water Corporation and the State Emergency Service\r\n(SES). A number | ||
84 | of community representatives were also represented on the | 84 | of community representatives were also represented on the | ||
85 | committee.\r\n#The Study Area\r\nThe study area, shown on Figure 1, | 85 | committee.\r\n#The Study Area\r\nThe study area, shown on Figure 1, | ||
86 | includes that portion of Terry\u2019s Creek within the City | 86 | includes that portion of Terry\u2019s Creek within the City | ||
87 | of\r\nRyde, from Terry Road to the creek\u2019s confluence with the | 87 | of\r\nRyde, from Terry Road to the creek\u2019s confluence with the | ||
88 | Lane Cove River.\r\nThe Eastwood town centre is located within the | 88 | Lane Cove River.\r\nThe Eastwood town centre is located within the | ||
89 | study area, and straddles the Main Northern\r\nRailway Line. In | 89 | study area, and straddles the Main Northern\r\nRailway Line. In | ||
90 | addition to the main creek, the study area includes all significant | 90 | addition to the main creek, the study area includes all significant | ||
91 | tributaries\r\nand many overland flow paths.\r\n\r\nSome consideration | 91 | tributaries\r\nand many overland flow paths.\r\n\r\nSome consideration | ||
92 | has also been given to works that have previously been | 92 | has also been given to works that have previously been | ||
93 | recommended\r\nwithin Parramatta City Council, where these works | 93 | recommended\r\nwithin Parramatta City Council, where these works | ||
94 | potentially impact on flooding within the\r\nCity of Ryde. The | 94 | potentially impact on flooding within the\r\nCity of Ryde. The | ||
95 | potential for flooding of properties in Parramatta City Council and | 95 | potential for flooding of properties in Parramatta City Council and | ||
96 | Hornsby\r\nShire Council has also been considered immediately upstream | 96 | Hornsby\r\nShire Council has also been considered immediately upstream | ||
97 | and downstream of the\r\nrailway crossing.\r\n#Reporting\r\nThe Study | 97 | and downstream of the\r\nrailway crossing.\r\n#Reporting\r\nThe Study | ||
98 | results have been presented in a number of reports as the study has | 98 | results have been presented in a number of reports as the study has | ||
99 | progressed,\r\nincluding reports covering:\r\n\r\n* the Flood Study | 99 | progressed,\r\nincluding reports covering:\r\n\r\n* the Flood Study | ||
100 | (May 2008);\r\n* Town Planning Considerations (July 2008); and | 100 | (May 2008);\r\n* Town Planning Considerations (July 2008); and | ||
101 | the\r\n* Floodplain Risk Management Study and Plan (this | 101 | the\r\n* Floodplain Risk Management Study and Plan (this | ||
102 | report).\r\n\r\nConsultation\r\nCommunity consultation has been an | 102 | report).\r\n\r\nConsultation\r\nCommunity consultation has been an | ||
103 | important component of the project. Key elements of\r\nthe | 103 | important component of the project. Key elements of\r\nthe | ||
104 | consultation process have been as follows:\r\n\r\n* regular meetings | 104 | consultation process have been as follows:\r\n\r\n* regular meetings | ||
105 | of the Eastwood & Terry\u2019s Creek Floodplain | 105 | of the Eastwood & Terry\u2019s Creek Floodplain | ||
106 | Management\r\nCommittee;\r\n* public review of the flood study | 106 | Management\r\nCommittee;\r\n* public review of the flood study | ||
107 | results, including a public display during July and\r\nAugust 2007, an | 107 | results, including a public display during July and\r\nAugust 2007, an | ||
108 | information day and feedback process; and\r\n* public exhibition of | 108 | information day and feedback process; and\r\n* public exhibition of | ||
109 | the draft floodplain risk management study and plan, prior to | 109 | the draft floodplain risk management study and plan, prior to | ||
110 | formal\r\nconsideration by Council.\r\n#Modelling of Flood | 110 | formal\r\nconsideration by Council.\r\n#Modelling of Flood | ||
111 | Behaviour\r\nFlood behaviour has been assessed using computer models. | 111 | Behaviour\r\nFlood behaviour has been assessed using computer models. | ||
112 | The catchment area and\r\nstormwater pipe network within the study | 112 | The catchment area and\r\nstormwater pipe network within the study | ||
113 | area was modelled using the DRAINS hydrologic\r\nmodel. Catchment | 113 | area was modelled using the DRAINS hydrologic\r\nmodel. Catchment | ||
114 | flows from the Parramatta and Hornsby Council portion of the | 114 | flows from the Parramatta and Hornsby Council portion of the | ||
115 | catchment\r\nwere generated using a less detailed RAFTS model. Flows | 115 | catchment\r\nwere generated using a less detailed RAFTS model. Flows | ||
116 | from these models were input to\r\na two dimensional TUFLOW hydraulic | 116 | from these models were input to\r\na two dimensional TUFLOW hydraulic | ||
117 | model to estimate flood depths and the extent of | 117 | model to estimate flood depths and the extent of | ||
118 | flood\r\ninundation.\r\n\r\nThe flood models were calibrated to the | 118 | flood\r\ninundation.\r\n\r\nThe flood models were calibrated to the | ||
119 | November 1984 flood. They were then used to\r\nsimulate flood | 119 | November 1984 flood. They were then used to\r\nsimulate flood | ||
120 | behaviour for a range of flood events, including a 5 year, 10 year, 20 | 120 | behaviour for a range of flood events, including a 5 year, 10 year, 20 | ||
121 | year, 50\r\nyear, 100 year and Probable Maximum Flood (PMF).\r\n#Flood | 121 | year, 50\r\nyear, 100 year and Probable Maximum Flood (PMF).\r\n#Flood | ||
122 | Risk Mapping & Development Controls\r\nThe area subject to flooding | 122 | Risk Mapping & Development Controls\r\nThe area subject to flooding | ||
123 | (up to the PMF) has been divided into three flood risk | 123 | (up to the PMF) has been divided into three flood risk | ||
124 | precincts\r\n(high, medium and low). Different development controls | 124 | precincts\r\n(high, medium and low). Different development controls | ||
125 | are proposed for the catchment,\r\ndepending on the type of | 125 | are proposed for the catchment,\r\ndepending on the type of | ||
126 | development and the flood risk precinct in which the development\r\nis | 126 | development and the flood risk precinct in which the development\r\nis | ||
127 | located. The flood risk precincts comprise:\r\n\r\n* The high flood | 127 | located. The flood risk precincts comprise:\r\n\r\n* The high flood | ||
128 | risk area \u2013 where high flood damages, potential risk to life, | 128 | risk area \u2013 where high flood damages, potential risk to life, | ||
129 | or\r\nevacuation problems are anticipated. It is recommended that most | 129 | or\r\nevacuation problems are anticipated. It is recommended that most | ||
130 | development is\r\nrestricted within this area.\r\n* The medium flood | 130 | development is\r\nrestricted within this area.\r\n* The medium flood | ||
131 | risk area \u2013 where there is still a significant risk of flood | 131 | risk area \u2013 where there is still a significant risk of flood | ||
132 | damage, but\r\nwhere these damages can be minimised by the application | 132 | damage, but\r\nwhere these damages can be minimised by the application | ||
133 | of appropriate\r\ndevelopment controls.\r\n* The low flood risk area | 133 | of appropriate\r\ndevelopment controls.\r\n* The low flood risk area | ||
134 | \u2013 where the risk of flood damage is low. Most land uses | 134 | \u2013 where the risk of flood damage is low. Most land uses | ||
135 | would\r\nbe permitted within this area (subject to other planning | 135 | would\r\nbe permitted within this area (subject to other planning | ||
136 | considerations).\r\nIn addition to the flood risk precincts, an | 136 | considerations).\r\nIn addition to the flood risk precincts, an | ||
137 | overland flow precinct has also been defined. This\r\ncomprises | 137 | overland flow precinct has also been defined. This\r\ncomprises | ||
138 | shallow areas of inundation distant from major watercourses where | 138 | shallow areas of inundation distant from major watercourses where | ||
139 | less\r\nrestrictive flood level and other controls apply.\r\n#The | 139 | less\r\nrestrictive flood level and other controls apply.\r\n#The | ||
140 | Flood Problem\r\nA flood damages database has been prepared for the | 140 | Flood Problem\r\nA flood damages database has been prepared for the | ||
141 | study area to quantify the flood\r\nproblem and to assist in | 141 | study area to quantify the flood\r\nproblem and to assist in | ||
142 | evaluating the economic merit of a range of flood | 142 | evaluating the economic merit of a range of flood | ||
143 | mitigation\r\nmeasures.\r\n\r\nThe database includes details on 1,361 | 143 | mitigation\r\nmeasures.\r\n\r\nThe database includes details on 1,361 | ||
144 | properties throughout the study area that could\r\npotentially be | 144 | properties throughout the study area that could\r\npotentially be | ||
145 | affected by flooding (up to a PMF flood). The database has further | 145 | affected by flooding (up to a PMF flood). The database has further | ||
146 | been\r\ndivided into 9 geographical areas (shown on Figure 1) to help | 146 | been\r\ndivided into 9 geographical areas (shown on Figure 1) to help | ||
147 | identify the spatial distribution\r\nof the flood problem over the | 147 | identify the spatial distribution\r\nof the flood problem over the | ||
148 | study area.\r\n\r\n#Flood Mitigation Options Investigated\r\nA total | 148 | study area.\r\n\r\n#Flood Mitigation Options Investigated\r\nA total | ||
149 | of 12 options were identified by the floodplain management committee | 149 | of 12 options were identified by the floodplain management committee | ||
150 | for analysis.\r\nThese options were initially assessed using | 150 | for analysis.\r\nThese options were initially assessed using | ||
151 | performance in the 100 year flood and\r\nconsideration of | 151 | performance in the 100 year flood and\r\nconsideration of | ||
152 | environmental and other factors. A short list of 6 options was | 152 | environmental and other factors. A short list of 6 options was | ||
153 | identified for\r\nfurther economic assessment. An additional option | 153 | identified for\r\nfurther economic assessment. An additional option | ||
154 | for the Eastwood town centre was also\r\ninvestigated following the | 154 | for the Eastwood town centre was also\r\ninvestigated following the | ||
155 | evaluation of these options. The options are shown in Table | 155 | evaluation of these options. The options are shown in Table | ||
156 | 3.\r\n\r\nThe short tunnel option looked at diverting flow from | 156 | 3.\r\n\r\nThe short tunnel option looked at diverting flow from | ||
157 | upstream of Terry Road through a 3.8m\r\ndiameter tunnel direct to a | 157 | upstream of Terry Road through a 3.8m\r\ndiameter tunnel direct to a | ||
158 | small basin in the lower part of Eastwood Park. The main\r\nobjective | 158 | small basin in the lower part of Eastwood Park. The main\r\nobjective | ||
159 | was to reduce the flow carried by Terry\u2019s Creek through the town | 159 | was to reduce the flow carried by Terry\u2019s Creek through the town | ||
160 | centre. This\r\noption reduces flood levels through the town centre by | 160 | centre. This\r\noption reduces flood levels through the town centre by | ||
161 | 0.4 to 0.6m in a 100 year flood, and\r\nreduces the present value of | 161 | 0.4 to 0.6m in a 100 year flood, and\r\nreduces the present value of | ||
162 | all flood damage by $3.2M. However, flood levels downstream\r\nof the | 162 | all flood damage by $3.2M. However, flood levels downstream\r\nof the | ||
163 | railway line increase marginally due to reduced travel times and | 163 | railway line increase marginally due to reduced travel times and | ||
164 | results in an increase\r\nin flood damage of $0.4M. The net benefit is | 164 | results in an increase\r\nin flood damage of $0.4M. The net benefit is | ||
165 | $2.8M and the estimated cost is $13M. This\r\noption is not favoured | 165 | $2.8M and the estimated cost is $13M. This\r\noption is not favoured | ||
166 | due to its poor benefit/cost ratio of 0.2 and the increase | 166 | due to its poor benefit/cost ratio of 0.2 and the increase | ||
167 | in\r\ndownstream flood levels.\r\n\r\nThe basin at Mobbs Lane and the | 167 | in\r\ndownstream flood levels.\r\n\r\nThe basin at Mobbs Lane and the | ||
168 | culvert upgrade at Terry Road are two options that have\r\nbeen | 168 | culvert upgrade at Terry Road are two options that have\r\nbeen | ||
169 | proposed in a report prepared for Parramatta City Council. Both | 169 | proposed in a report prepared for Parramatta City Council. Both | ||
170 | options have been\r\nreviewed due to their potential impact on flood | 170 | options have been\r\nreviewed due to their potential impact on flood | ||
171 | behaviour through the current study area.\r\n\r\nThe basin is likely | 171 | behaviour through the current study area.\r\n\r\nThe basin is likely | ||
172 | to reduce flood levels whilst the culvert upgrade could potentially | 172 | to reduce flood levels whilst the culvert upgrade could potentially | ||
173 | increase\r\nflood levels. Model results indicate a reduction in flood | 173 | increase\r\nflood levels. Model results indicate a reduction in flood | ||
174 | levels of 0.1 to 0.2m through\r\nEastwood in a 100 year flood due to | 174 | levels of 0.1 to 0.2m through\r\nEastwood in a 100 year flood due to | ||
175 | the combined measures, but an increase of around\r\n0.1m in more | 175 | the combined measures, but an increase of around\r\n0.1m in more | ||
176 | frequent floods (5 year and 10 year events). This is due to the basin | 176 | frequent floods (5 year and 10 year events). This is due to the basin | ||
177 | becoming\r\nless effective in smaller floods whilst the impact of the | 177 | becoming\r\nless effective in smaller floods whilst the impact of the | ||
178 | culvert upgrade became more\r\npronounced. It is recommended that a | 178 | culvert upgrade became more\r\npronounced. It is recommended that a | ||
179 | basin at Mobbs Lane be pursued with Parramatta City\r\nCouncil, with | 179 | basin at Mobbs Lane be pursued with Parramatta City\r\nCouncil, with | ||
180 | possible cost sharing arrangements between both Councils and the | 180 | possible cost sharing arrangements between both Councils and the | ||
181 | DECCW.\r\n\r\nAmplification of the Terry Road culvert can not be | 181 | DECCW.\r\n\r\nAmplification of the Terry Road culvert can not be | ||
182 | recommended without further\r\nconsideration of the impacts in smaller | 182 | recommended without further\r\nconsideration of the impacts in smaller | ||
183 | floods.\r\n\r\nDrainage improvements were investigated along Abuklea | 183 | floods.\r\n\r\nDrainage improvements were investigated along Abuklea | ||
184 | Road and in the vicinity of the TG\r\nMilner Sportsground. The initial | 184 | Road and in the vicinity of the TG\r\nMilner Sportsground. The initial | ||
185 | scheme included doubling the size of the existing drainage\r\npipeline | 185 | scheme included doubling the size of the existing drainage\r\npipeline | ||
186 | behind properties in Abuklea Road, but provided limited benefits. | 186 | behind properties in Abuklea Road, but provided limited benefits. | ||
187 | Further\r\nstormwater drainage improvements have been proposed for | 187 | Further\r\nstormwater drainage improvements have been proposed for | ||
188 | this area (see Table 4 for\r\npotential drainage improvements in this | 188 | this area (see Table 4 for\r\npotential drainage improvements in this | ||
189 | area and others).\r\n\r\nDebris control measures to prevent blockage | 189 | area and others).\r\n\r\nDebris control measures to prevent blockage | ||
190 | of the railway culvert and the Progress Avenue\r\nculverts were | 190 | of the railway culvert and the Progress Avenue\r\nculverts were | ||
191 | investigated. The present value of all flood damage could be reduced | 191 | investigated. The present value of all flood damage could be reduced | ||
192 | by\r\napproximately $0.5M if the potential for blockage of these | 192 | by\r\napproximately $0.5M if the potential for blockage of these | ||
193 | structures is eliminated. The\r\nmeasures are envisaged to incorporate | 193 | structures is eliminated. The\r\nmeasures are envisaged to incorporate | ||
194 | bollards around the perimeter of the railway culvert, and structural | 194 | bollards around the perimeter of the railway culvert, and structural | ||
195 | fencing along the boundary of the open channel upstream of the | 195 | fencing along the boundary of the open channel upstream of the | ||
196 | Progress\r\nAvenue culverts. This measure has an estimated cost of the | 196 | Progress\r\nAvenue culverts. This measure has an estimated cost of the | ||
197 | order of $50,000 and a\r\nbenefit/cost ratio considerably greater than | 197 | order of $50,000 and a\r\nbenefit/cost ratio considerably greater than | ||
198 | 1.0. These works are recommended.\r\nThe final stage of a drainage | 198 | 1.0. These works are recommended.\r\nThe final stage of a drainage | ||
199 | augmentation scheme at First Avenue in the eastern town\r\ncentre was | 199 | augmentation scheme at First Avenue in the eastern town\r\ncentre was | ||
200 | included in the flood model. Results indicated that flooding of a | 200 | included in the flood model. Results indicated that flooding of a | ||
201 | number of\r\ncommercial properties along Rowe Street could be | 201 | number of\r\ncommercial properties along Rowe Street could be | ||
202 | alleviated by these works, with the\r\npresent value of all flood | 202 | alleviated by these works, with the\r\npresent value of all flood | ||
203 | damages reduced by approximately $0.6M. The cost of the final\r\nstage | 203 | damages reduced by approximately $0.6M. The cost of the final\r\nstage | ||
204 | of works has been estimated at $1.3M, which provides a benefit/cost | 204 | of works has been estimated at $1.3M, which provides a benefit/cost | ||
205 | ratio of 0.5. As\r\nthis is the final stage of a major drainage | 205 | ratio of 0.5. As\r\nthis is the final stage of a major drainage | ||
206 | augmentation scheme, completion of this final\r\nstage is | 206 | augmentation scheme, completion of this final\r\nstage is | ||
207 | recommended.\r\n\r\nThe options recommended above only partially | 207 | recommended.\r\n\r\nThe options recommended above only partially | ||
208 | reduce flooding through the Eastwood town\r\ncentre. Further | 208 | reduce flooding through the Eastwood town\r\ncentre. Further | ||
209 | evaluation of drainage augmentation measures in this area | 209 | evaluation of drainage augmentation measures in this area | ||
210 | was\r\nsubsequently undertaken. A scheme was identified | 210 | was\r\nsubsequently undertaken. A scheme was identified | ||
211 | including:\r\n\r\n* modification of the existing drain upstream of | 211 | including:\r\n\r\n* modification of the existing drain upstream of | ||
212 | Progress Avenue, including the option to\r\ncover this drain;\r\n* new | 212 | Progress Avenue, including the option to\r\ncover this drain;\r\n* new | ||
213 | twin box culverts from Glen Street Reserve to Eastwood Park, under | 213 | twin box culverts from Glen Street Reserve to Eastwood Park, under | ||
214 | Lakeside\r\nRoad; and\r\n* an inlet headwall in Glen Street | 214 | Lakeside\r\nRoad; and\r\n* an inlet headwall in Glen Street | ||
215 | Reserve.\r\n\r\nThe drainage augmentation measures reduce the 100 year | 215 | Reserve.\r\n\r\nThe drainage augmentation measures reduce the 100 year | ||
216 | flood by up to 1.0 to 1.1m\r\nthrough the town centre, reducing the | 216 | flood by up to 1.0 to 1.1m\r\nthrough the town centre, reducing the | ||
217 | depth of flooding to less than 0.3m. The estimated\r\ncost is $8.5M, | 217 | depth of flooding to less than 0.3m. The estimated\r\ncost is $8.5M, | ||
218 | and the present value of flood benefits estimated at $4.6M. This | 218 | and the present value of flood benefits estimated at $4.6M. This | ||
219 | provides a\r\nbenefit/cost ratio of 0.5, which is a substantial | 219 | provides a\r\nbenefit/cost ratio of 0.5, which is a substantial | ||
220 | improvement over the other tunnel options\r\ninvestigated. Given the | 220 | improvement over the other tunnel options\r\ninvestigated. Given the | ||
221 | reduced risk to personal safety this option could be considered | 221 | reduced risk to personal safety this option could be considered | ||
222 | more\r\nfavourably. It would also remove many of the flooding | 222 | more\r\nfavourably. It would also remove many of the flooding | ||
223 | constraints on future redevelopment of\r\nthe town centre. The option | 223 | constraints on future redevelopment of\r\nthe town centre. The option | ||
224 | has been included in the recommended Floodplain | 224 | has been included in the recommended Floodplain | ||
225 | Management\r\nPlan.\r\n#Stormwater Drainage Problems\r\nA large focus | 225 | Management\r\nPlan.\r\n#Stormwater Drainage Problems\r\nA large focus | ||
226 | of the current study has been based on addressing the flood problems | 226 | of the current study has been based on addressing the flood problems | ||
227 | in the\r\nEastwood town centre. However, the total flood damage from | 227 | in the\r\nEastwood town centre. However, the total flood damage from | ||
228 | this area represents only 30%\r\nof the flood damage experienced | 228 | this area represents only 30%\r\nof the flood damage experienced | ||
229 | throughout the wider study area (based on the present\r\nvalue of | 229 | throughout the wider study area (based on the present\r\nvalue of | ||
230 | flood damage in Table 2). Most of the other flooding problems are | 230 | flood damage in Table 2). Most of the other flooding problems are | ||
231 | related to\r\nstormwater drainage and overland flow problems along the | 231 | related to\r\nstormwater drainage and overland flow problems along the | ||
232 | tributaries that lead to Terry\u2019s\r\nCreek.\r\nThe majority of | 232 | tributaries that lead to Terry\u2019s\r\nCreek.\r\nThe majority of | ||
233 | flooding problems are related to surface flows that are less than 0.5m | 233 | flooding problems are related to surface flows that are less than 0.5m | ||
234 | in\r\ndepth. Flood behaviour within these areas is very much | 234 | in\r\ndepth. Flood behaviour within these areas is very much | ||
235 | influenced by local conditions,\r\nincluding fences, structures, the | 235 | influenced by local conditions,\r\nincluding fences, structures, the | ||
236 | accuracy of the ALS survey, and assumed floor levels of\r\npotentially | 236 | accuracy of the ALS survey, and assumed floor levels of\r\npotentially | ||
237 | affected buildings. Further investigations will be required in several | 237 | affected buildings. Further investigations will be required in several | ||
238 | areas to\r\ndetermine the most appropriate stormwater drainage | 238 | areas to\r\ndetermine the most appropriate stormwater drainage | ||
239 | improvements.\r\nTable 4 lists some provisional stormwater drainage | 239 | improvements.\r\nTable 4 lists some provisional stormwater drainage | ||
240 | improvement measures. These works\r\nare subject to detailed | 240 | improvement measures. These works\r\nare subject to detailed | ||
241 | assessments, but are anticipated to include:\r\n\r\n* formalisation of | 241 | assessments, but are anticipated to include:\r\n\r\n* formalisation of | ||
242 | overland flow paths;\r\n* amplification of stormwater pipe lines; | 242 | overland flow paths;\r\n* amplification of stormwater pipe lines; | ||
243 | and\r\n* potential relocation of buildings that currently restrict | 243 | and\r\n* potential relocation of buildings that currently restrict | ||
244 | overland flow paths.\r\n\r\nAdditional measures have been recommended | 244 | overland flow paths.\r\n\r\nAdditional measures have been recommended | ||
245 | for Area 7, including additional inlet pits in\r\nBrabyn Street, | 245 | for Area 7, including additional inlet pits in\r\nBrabyn Street, | ||
246 | improvements to the culvert in Jim Walsh Park, and a feasibility study | 246 | improvements to the culvert in Jim Walsh Park, and a feasibility study | ||
247 | into a\r\npotential detention basin in Jim Walsh | 247 | into a\r\npotential detention basin in Jim Walsh | ||
248 | Park.\r\n\r\n#Planning Issues\r\nExisting planning controls related to | 248 | Park.\r\n\r\n#Planning Issues\r\nExisting planning controls related to | ||
249 | flooding have been reviewed during the course of | 249 | flooding have been reviewed during the course of | ||
250 | these\r\ninvestigations.\r\n\r\nA number of flood related controls | 250 | these\r\ninvestigations.\r\n\r\nA number of flood related controls | ||
251 | have been proposed for the study area, which would be\r\nimplemented | 251 | have been proposed for the study area, which would be\r\nimplemented | ||
252 | through a flood risk management chapter to be included in the | 252 | through a flood risk management chapter to be included in the | ||
253 | City-wide DCP.\r\n\r\nThe DCP chapter outlines a common preamble, | 253 | City-wide DCP.\r\n\r\nThe DCP chapter outlines a common preamble, | ||
254 | principles and objectives that would apply to\r\nall catchments within | 254 | principles and objectives that would apply to\r\nall catchments within | ||
255 | the City of Ryde. Specific controls for Eastwood and Terry\u2019s | 255 | the City of Ryde. Specific controls for Eastwood and Terry\u2019s | ||
256 | Creek, as\r\ndetermined during the course of the floodplain management | 256 | Creek, as\r\ndetermined during the course of the floodplain management | ||
257 | study, are included in a matrix\r\nof prescriptive controls (included | 257 | study, are included in a matrix\r\nof prescriptive controls (included | ||
258 | as Figure 2). Other matrices would be developed and\r\nappended to the | 258 | as Figure 2). Other matrices would be developed and\r\nappended to the | ||
259 | DCP chapter as studies and plans on other catchments are | 259 | DCP chapter as studies and plans on other catchments are | ||
260 | completed.\r\n\r\nMany of the measures included in the proposed DCP | 260 | completed.\r\n\r\nMany of the measures included in the proposed DCP | ||
261 | chapter formalise procedures that are\r\ncurrently applied by officers | 261 | chapter formalise procedures that are\r\ncurrently applied by officers | ||
262 | from Council. Some changes that have been | 262 | from Council. Some changes that have been | ||
263 | recommended\r\ninclude:\r\n\r\n* increase of freeboard from 0.3m to | 263 | recommended\r\ninclude:\r\n\r\n* increase of freeboard from 0.3m to | ||
264 | 0.5m (except in the overland flow precinct);\r\n* limited controls on | 264 | 0.5m (except in the overland flow precinct);\r\n* limited controls on | ||
265 | residential development above the 100 year flood, to | 265 | residential development above the 100 year flood, to | ||
266 | satisfy\r\nfreeboard allowance and vertical evacuation | 266 | satisfy\r\nfreeboard allowance and vertical evacuation | ||
267 | requirements;\r\n* more comprehensive car parking and driveway access | 267 | requirements;\r\n* more comprehensive car parking and driveway access | ||
268 | requirements;\r\n* varying controls based on sensitivity of landuse to | 268 | requirements;\r\n* varying controls based on sensitivity of landuse to | ||
269 | flood risk;\r\n* providing concessions to encourage existing | 269 | flood risk;\r\n* providing concessions to encourage existing | ||
270 | floodprone properties to redevelop in a\r\nflood-sensitive | 270 | floodprone properties to redevelop in a\r\nflood-sensitive | ||
271 | manner.\r\n\r\nThe study has also recognised that there may be | 271 | manner.\r\n\r\nThe study has also recognised that there may be | ||
272 | locations beyond the limit of the 100 year\r\nflood (plus freeboard) | 272 | locations beyond the limit of the 100 year\r\nflood (plus freeboard) | ||
273 | where controls on residential development may be required in | 273 | where controls on residential development may be required in | ||
274 | some\r\nrare circumstances (eg basement carparks, vertical | 274 | some\r\nrare circumstances (eg basement carparks, vertical | ||
275 | evacuation). In accordance with the\r\nDepartment of Planning\u2019s | 275 | evacuation). In accordance with the\r\nDepartment of Planning\u2019s | ||
276 | January 2007 Guideline, Council will need to seek approval from\r\nthe | 276 | January 2007 Guideline, Council will need to seek approval from\r\nthe | ||
277 | State Government to impose controls in this area.\r\n#The Recommended | 277 | State Government to impose controls in this area.\r\n#The Recommended | ||
278 | Floodplain Management Measures\r\nThe draft Eastwood and Terry\u2019s | 278 | Floodplain Management Measures\r\nThe draft Eastwood and Terry\u2019s | ||
279 | Creek Floodplain Risk Management Plan is shown on\r\nFigure 3 and | 279 | Creek Floodplain Risk Management Plan is shown on\r\nFigure 3 and | ||
280 | summarised in Table 5.\r\n\r\nIt is important to note that not all | 280 | summarised in Table 5.\r\n\r\nIt is important to note that not all | ||
281 | flooding problems in the study area have been alleviated. | 281 | flooding problems in the study area have been alleviated. | ||
282 | A\r\ncomplete solution to the flooding problem is not cost effective | 282 | A\r\ncomplete solution to the flooding problem is not cost effective | ||
283 | from a floodplain management\r\nperspective. However, problems can be | 283 | from a floodplain management\r\nperspective. However, problems can be | ||
284 | reduced gradually over time as sensible\r\nredevelopment occurs. There | 284 | reduced gradually over time as sensible\r\nredevelopment occurs. There | ||
285 | may also be some scope to completely alter the drainage\r\nregime | 285 | may also be some scope to completely alter the drainage\r\nregime | ||
286 | through the town centre in association with major redevelopment | 286 | through the town centre in association with major redevelopment | ||
287 | proposals.\r\n#Timing and Funding\r\nThe total cost of implementing | 287 | proposals.\r\n#Timing and Funding\r\nThe total cost of implementing | ||
288 | all the recommended measures is approximately $14.4M.\r\n\r\nThis | 288 | all the recommended measures is approximately $14.4M.\r\n\r\nThis | ||
289 | includes an amount of $8.5M for drainage augmentation measures through | 289 | includes an amount of $8.5M for drainage augmentation measures through | ||
290 | the town\r\ncentre. It is envisaged that the Plan would be implemented | 290 | the town\r\ncentre. It is envisaged that the Plan would be implemented | ||
291 | progressively over a 5 to 10 year\r\ntime frame.\r\n\r\nThe timing of | 291 | progressively over a 5 to 10 year\r\ntime frame.\r\n\r\nThe timing of | ||
292 | the proposed works will depend on the overall budgetary commitments | 292 | the proposed works will depend on the overall budgetary commitments | ||
293 | of\r\nCouncil and the availability of funds from other sources (eg | 293 | of\r\nCouncil and the availability of funds from other sources (eg | ||
294 | State Government, potential\r\nSection 94 contributions, private | 294 | State Government, potential\r\nSection 94 contributions, private | ||
295 | sector contributions etc).", | 295 | sector contributions etc).", | ||
296 | "num_resources": 1, | 296 | "num_resources": 1, | ||
297 | "num_tags": 2, | 297 | "num_tags": 2, | ||
298 | "organization": { | 298 | "organization": { | ||
299 | "approval_status": "approved", | 299 | "approval_status": "approved", | ||
300 | "created": "2021-03-04T09:34:55.967895", | 300 | "created": "2021-03-04T09:34:55.967895", | ||
301 | "description": "The City of Ryde is a local government area that | 301 | "description": "The City of Ryde is a local government area that | ||
302 | services certain suburbs located within the Lower North Shore and | 302 | services certain suburbs located within the Lower North Shore and | ||
303 | Northern Suburbs of Sydney, NSW; proclaimed as the City of Ryde in | 303 | Northern Suburbs of Sydney, NSW; proclaimed as the City of Ryde in | ||
304 | 1992.\r\n\r\nThe local government area extends from the Parramatta | 304 | 1992.\r\n\r\nThe local government area extends from the Parramatta | ||
305 | River to the Lane Cove River which encircles the area in the north, | 305 | River to the Lane Cove River which encircles the area in the north, | ||
306 | and is bounded in the east by the peninsula of Hunters Hill and the | 306 | and is bounded in the east by the peninsula of Hunters Hill and the | ||
307 | City of Parramatta in the west.\r\nIt is 40.65km2 in area and home to | 307 | City of Parramatta in the west.\r\nIt is 40.65km2 in area and home to | ||
308 | over 117,170 people. | 308 | over 117,170 people. | ||
309 | \r\n\r\nhttp://www.ryde.nsw.gov.au/Home\r\n\r\nCouncil has undertaken | 309 | \r\n\r\nhttp://www.ryde.nsw.gov.au/Home\r\n\r\nCouncil has undertaken | ||
310 | several studies on overland flow and localised flooding of Macquarie | 310 | several studies on overland flow and localised flooding of Macquarie | ||
311 | Park Catchment and the Eastwood and Terry\u2019s Creek | 311 | Park Catchment and the Eastwood and Terry\u2019s Creek | ||
312 | nt/Planning-Controls/Other-Planning-Considerations/Flood-Prone-Areas", | 312 | nt/Planning-Controls/Other-Planning-Considerations/Flood-Prone-Areas", | ||
313 | "id": "1763c56c-156b-4d33-befa-9df41bf150c1", | 313 | "id": "1763c56c-156b-4d33-befa-9df41bf150c1", | ||
314 | "image_url": "2021-03-23-013607.937443ryde.png", | 314 | "image_url": "2021-03-23-013607.937443ryde.png", | ||
315 | "is_organization": true, | 315 | "is_organization": true, | ||
316 | "name": "ryde-city-council", | 316 | "name": "ryde-city-council", | ||
317 | "state": "active", | 317 | "state": "active", | ||
318 | "title": "Ryde City Council", | 318 | "title": "Ryde City Council", | ||
319 | "type": "organization" | 319 | "type": "organization" | ||
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327 | "cache_last_updated": null, | 327 | "cache_last_updated": null, | ||
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335 | "last_modified": null, | 335 | "last_modified": null, | ||
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337 | "mimetype": null, | 337 | "mimetype": null, | ||
338 | "mimetype_inner": null, | 338 | "mimetype_inner": null, | ||
339 | "name": "Eastwood & Terrys Creek Floodplain Risk Management | 339 | "name": "Eastwood & Terrys Creek Floodplain Risk Management | ||
340 | Study & Plan - Main Report October 2009", | 340 | Study & Plan - Main Report October 2009", | ||
341 | "package_id": "25a83b12-2e0b-4be8-9425-742d8621196f", | 341 | "package_id": "25a83b12-2e0b-4be8-9425-742d8621196f", | ||
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435 | "spatial_coverage": "New South Wales (NSW81093)", | 435 | "spatial_coverage": "New South Wales (NSW81093)", | ||
436 | "state": "active", | 436 | "state": "active", | ||
437 | "tags": [ | 437 | "tags": [ | ||
438 | { | 438 | { | ||
439 | "display_name": "Eastwood", | 439 | "display_name": "Eastwood", | ||
440 | "id": "ed7da17d-7bf6-44d2-9422-9eef70ed6798", | 440 | "id": "ed7da17d-7bf6-44d2-9422-9eef70ed6798", | ||
441 | "name": "Eastwood", | 441 | "name": "Eastwood", | ||
442 | "state": "active", | 442 | "state": "active", | ||
443 | "vocabulary_id": null | 443 | "vocabulary_id": null | ||
444 | }, | 444 | }, | ||
445 | { | 445 | { | ||
446 | "display_name": "Terrys Creek", | 446 | "display_name": "Terrys Creek", | ||
447 | "id": "4212d8e8-39b7-49bf-8e7f-fb5dba67f5b7", | 447 | "id": "4212d8e8-39b7-49bf-8e7f-fb5dba67f5b7", | ||
448 | "name": "Terrys Creek", | 448 | "name": "Terrys Creek", | ||
449 | "state": "active", | 449 | "state": "active", | ||
450 | "vocabulary_id": null | 450 | "vocabulary_id": null | ||
451 | } | 451 | } | ||
452 | ], | 452 | ], | ||
453 | "temporal_coverage_to": "2009-10-01 00:00:00", | 453 | "temporal_coverage_to": "2009-10-01 00:00:00", | ||
454 | "title": "Eastwood & Terrys Creek Floodplain Risk Management Study & | 454 | "title": "Eastwood & Terrys Creek Floodplain Risk Management Study & | ||
455 | Plan Main Report", | 455 | Plan Main Report", | ||
456 | "type": "dataset", | 456 | "type": "dataset", | ||
457 | "unpublished": "false", | 457 | "unpublished": "false", | ||
458 | "update_freq": "as_required", | 458 | "update_freq": "as_required", | ||
459 | "url": "", | 459 | "url": "", | ||
460 | "version": null | 460 | "version": null | ||
461 | } | 461 | } |