Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...
Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...
Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...
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<strong>Powerline</strong> <strong>Flood</strong> Retarding Structure<br />
Pinal County, AZ<br />
Draft Supplemental Watershed <strong>Plan</strong><br />
<strong>and</strong> <strong>Environ</strong>mental <strong>Assessment</strong><br />
evaluated project life. Operation includes the administration, management, <strong>and</strong> performance of<br />
non-maintenance actions needed to keep completed measures safe <strong>and</strong> functioning as planned.<br />
The National Operation <strong>and</strong> Maintenance Manual will be used as a guide for operation.<br />
Maintenance includes performing work <strong>and</strong> providing materials to prevent the deterioration of the<br />
installed works. Maintenance also includes repairing damage <strong>and</strong> replacing the measure or its<br />
components. Damage to completed measures caused by normal deterioration, drought, flooding<br />
from rainfall greater-than-design rainfall, or v<strong>and</strong>alism is considered maintenance. Maintenance<br />
includes both routine <strong>and</strong> recurring needs such as:<br />
• Annual control of woody species on or near the channel.<br />
• Rodent control.<br />
• Vector control, if necessary.<br />
• Repair <strong>and</strong> maintenance of the existing drainage structures.<br />
• Other specific items will be identified during design.<br />
Inspections are necessary to ensure that the installed measures are safe <strong>and</strong> functioning properly.<br />
Inspections are to: a) assess the adequacy of OM&R activities; b) identify needed OM&R work; c)<br />
identify unsafe conditions, including significant changes in the use of the flood plain below the<br />
channel; d) specify ways of relieving unsafe work or performing other needed work; <strong>and</strong> e) set<br />
action dates for performing corrective actions.<br />
The Sponsors are responsible for inspecting completed measures. Inspections will be made at least<br />
annually on a regularly scheduled basis for the life of the structure <strong>and</strong> after any major events such<br />
as floods or earthquakes. The Operation <strong>and</strong> Maintenance Agreement will specify any other needed<br />
inspections. The NRCS may, depending on the availability of staff, assist the Sponsors with the<br />
inspections. Inspection reports will be supplied to NRCS following each inspection.<br />
The estimated annual cost of operation <strong>and</strong> maintenance for the Preferred Alternative is $212,700<br />
(see NRCS Table 4 in Section 8.7).<br />
8.7 NRCS NATIONAL WATERSHED MANUAL TABLES<br />
USDA- NRCS Page 8-8 <strong>Jan</strong>uary <strong>2013</strong><br />
Kimley-Horn <strong>and</strong> Associates, Inc.
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