Laserfiche WebLink
<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Bosley Wash Drainage Master Plan <br />f"'~,'-:-' " ,-_. ~ <br /> <br /> <br />Pha~e 2: Alternative Drainage Facility Evaluation <br /> <br />3.4.2 Properties over 50% impacted by flooding <br /> <br />The next level of property acquisition was to identify parcels for which over 50% of the <br />lands were subject to flooding during the 100-year flood. This 50% mayor may not <br />include structures subject to impact during flood events. This acquisition approach <br />resulted in the identification of 180 acres of property and a cost of $2.7 million dollars. <br />Figure 12 depicts the parcels identified that are subject to flooding over 50% of their area. <br /> <br />3.4.3 Properties impacted by flooding <br /> <br />The highest level of property acquisition is the purchase of all properties that are subject <br />to flooding, regardless of the level of impact. As expected, this includes a significant area <br />and cost. The tOlal area &ssociated witlt the:; identii-ied parcels is 4::;0 acres at a cost of $3.2 <br />million. Figure 13 depicts all parcels that are'subject to flooding during the 100-year <br />flood. <br /> <br />3.4.4 Flood easements <br /> <br />Another alternative that was considered was the purchase of flood easements from <br />property owners with property that did not include impacted structures. In this case, large <br />floods would inundate property, but would not result in significant or permanent damage. <br />Rather than purchasing the land outright, this option considered the purchase of a right to <br />use the property for flooding. While this reduces the liability of the County, it was <br />concluded that the limited resources of the County should be directed toward addressing <br />the causes of flooding or eliminating the damage associated with flooding. Therefore, this <br />alternative was not explored further. <br /> <br />3.5 Operational Modifications <br /> <br />In many cases, the operation of the drainage systems in Bosley Wash can impact the <br />flood hazard. For example, routine maintenance has been shown to reduce flooding in the <br />vicinity of the Government Highline Canal. Routine operational practices have generally <br />been incorporated into this study. Observations made during the field reconnaissance <br />visits indicated a regular maintenance effort along the drainageways in public rights of <br />way. This regular maintenance, consisting of mowing, weed and debris removal, and <br /> <br />fiz:IiS;~?-:~~'&:'=7-':-7;.~~?{L '-' ~,< :~~::~-',-~-- :-::., \. _~~; ,2,~:~:l,v_ ~ ~____ ,-~~'~--__ _ <br /> <br />';';"";~''';):" <br /> <br />'/" ~' <br />~-"~:~I :::t11fv~<;,'; <br /> <br /> <br />Page 15 <br /> <br />/,...~ <br />G~ <br />~..\,-' <br /> <br />@'1 <br />