| snippet:
|
From the RDN-Flood extents and flood level contours of the designated flood event for the riverine portion of the Englishman River including a freeboard allowance of 0.6 m. The designated flood event is a 200-year return period river flood that includes a climate change allowance of +25% river flow over the current (2020) value combined with a 200-year return period coastal stillwater flood level that includes 1 m of relative sea level rise to Year 2100. |
| summary:
|
From the RDN-Flood extents and flood level contours of the designated flood event for the riverine portion of the Englishman River including a freeboard allowance of 0.6 m. The designated flood event is a 200-year return period river flood that includes a climate change allowance of +25% river flow over the current (2020) value combined with a 200-year return period coastal stillwater flood level that includes 1 m of relative sea level rise to Year 2100. |
| accessInformation:
|
Regional District of Nanaimo |
| thumbnail:
|
|
| maxScale:
|
5000 |
| typeKeywords:
|
[] |
| description:
|
<DIV STYLE="text-align:Left;"><P /><TABLE STYLE="margin:0 0 0 0;"><TBODY><TR><TD STYLE="padding:0 0 0 0;"><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">1</SPAN><SPAN>. The flood extents and flood level contours are associated with the designated flood event for the riverine portion of the Englishman River including a freeboard allowance of 0.6 m. Flooding may still occur to levels above the estimated flood levels, and outside the estimated flood extents. The Regional District of Nanaimo does not assume any liability for the accuracy of the estimated flood extents and flood level contours. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">2</SPAN><SPAN>. The flood extents and flood level contours represent a combination of the river flood level and the coastal stillwater flood level that were derived from independently modelled flood scenarios. The highest flood levels for a given location were selected. Floodplain limits are not delineated for tributary creeks. The flood extents and flood level contours should be considered together with complementary studies such as master drainage plans. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">3. </SPAN><SPAN>The designated flood event for the riverine portion of the Englishman River is a 200-year return period peak instantaneous flood event having a statistical annual exceedance probability (probability of a flood event of equal or greater magnitude occurring in a given year) of approximately 0.5%. The river flow has been increased by 25% over the current (2020) value to account for projected climate change impacts. A freeboard allowance of 0.6 m has been added to account for: (1) hydrologic and hydraulic modelling uncertainties, (2) local hydraulic effects such as waves and surges, and (3) some degree of river and delta processes. However, the freeboard allowance does not account for significant changes in channel shape or location. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">4. </SPAN><SPAN>The downstream coastal flood level reflects astronomical tides, a 200-year return period storm surge, and a freeboard allowance of 0.6 m, but does not include an allowance for wave effects. The coastal flood level has been increased by 1.0 m to account for the effects of relative sea level rise to Year 2100. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">5. </SPAN><SPAN>The flood extents and flood level contours do not include areas below the flood level contour of 5 m CGVD2013, as these areas lie within the coastal floodplain limits, which has not been defined as part of this work. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">6. </SPAN><SPAN>The flood extents and flood level contours do not provide information on the potential for site-specific flood-related hazards such as bank erosion, aggradation, debris accumulation and sudden shifts in river channel alignment. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">7. </SPAN><SPAN>Topography used to develop the flood extents and flood level contours is based on LiDAR data that may not accurately reflect the current ground elevation. For site-specific application, the flood level can be related to the ground elevation by topographic survey. </SPAN></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN /></P><P STYLE="font-size:12ptmargin:0 0 0 0;"><SPAN STYLE="font-weight:bold;">8. </SPAN><SPAN>When adopted by bylaw, the Regional District of Nanaimo is responsible for land use regulation within the floodplain limits, which are the limits that contain the flood extents. Information on floodplain management can be found in the BC Flood Hazard Area Land Use Management Guidelines. </SPAN></P><P /></TD></TR></TBODY></TABLE><DIV><P><SPAN /></P></DIV></DIV> |
| licenseInfo:
|
<DIV STYLE="text-align:Left;"><DIV><P><SPAN STYLE="font-weight:bold;font-size:16pt">Terms of Use</SPAN></P><P><SPAN>The disclaimer applies to all data provided by the City of Parksville GIS Department.</SPAN></P><P><SPAN /></P><P><SPAN>The City of Parksville makes no representation or warranty; either expressed or implied, in fact or in law, with respect to the accuracy, completeness or appropriateness of the data, materials or documents contained or referenced herein or provided.</SPAN></P><P><SPAN /></P><P><SPAN>In addition, the City of Parksville shall not be responsible for any action, cost, loss, or liability whatsoever arising from the reliance on or use of this information provided by the City.</SPAN></P><P><SPAN /></P><P><SPAN>These files are for reference purposes only and the City of Parksville is not liable for any consequences or damages any individual may incur as a result of misrepresented, misquoted, or mistaken information.</SPAN></P><P><SPAN /></P><P><SPAN>The information provided is not meant to be an authoritative guide.</SPAN></P><P><SPAN /></P><P><SPAN STYLE="font-weight:bold;font-size:16pt">No Warranty</SPAN></P><P><SPAN /></P><P><SPAN>The Information is licensed "as is", and the Information Provider excludes all representations, warranties, obligations, and liabilities, whether express or implied, to the maximum extent permitted by law.</SPAN></P><P><SPAN /></P><P><SPAN>The Information Provider is not liable for any errors or omissions in the Information, and will not under any circumstances be liable for any direct, indirect, special, incidental, consequential, or other loss, injury or damage caused by its use or otherwise arising in connection with this license or the Information, even if specifically advised of the possibility of such loss, injury or damage.</SPAN></P><P><SPAN /></P><P><SPAN>You accept all responsibility for decisions or actions taken based on the use of City of Parksville spatial data. Under no circumstances will the Information Provider be held liable for such events.</SPAN></P><P><SPAN /></P><P><SPAN>You accept responsibility for contacting appropriate City of Parksville staff before making important decisions based on the Information.</SPAN></P><P><SPAN /></P><P><SPAN>Original Bylaws should be consulted for all purposes of interpretation and application of the Bylaws.</SPAN></P></DIV></DIV> |
| catalogPath:
|
|
| title:
|
GIS.Englishman_River_Flood_Extents |
| type:
|
|
| url:
|
|
| tags:
|
["Englishman River","Floodplain"] |
| culture:
|
en-CA |
| portalUrl:
|
|
| name:
|
|
| guid:
|
|
| minScale:
|
150000000 |
| spatialReference:
|
|