Laserfiche WebLink
ENGINEER'S INSPECTION REPORT <br />DAM NAME SMITH <br />DATE 4/22/2009 <br />DAM I D 350103 <br />GUIDELINES FOR DETERMINING CONDITIONS <br />CONDITIONS OBSERVED - APPLIES TO UPSTREAM SLOPE CREST DOWNSTREAM SLOPE OUTLET SPILLWAY <br />GOOD <br />In general, ihis parl of the structure has a near new <br />appearance, and conditions observed m this area do not <br />appear ro threaten the safety of the dam <br />GOOD <br />No ewdence of uncontrolled seepage. No unexplained <br />�ncrease �n flows from designed drams All seepage is <br />clear Seepage conddions do not appear to threaten the <br />safety of the dam <br />GOOD <br />Mon�toring includes movement surveys and leakage <br />measurements for all dams, and piezometer readings for <br />High hazard dams Instrumentation is in reliable, working <br />condition A plan for monitoring the instrumenlation and <br />analyzing results by the owner's engineer is in effect <br />Penodic rospeciions by owners engineer <br />ACCEPTABLE <br />Although general cross-section is maintained, surfaces <br />may be irregular, eroded, rutted, spalled, or othenvise not <br />in new condiUon. Conditions in this area do not currently <br />appear to threaten the safety of the dam <br />CONDITIONS OBSERVED - APPLIES TO SEEPAGE <br />ACCEPTABLE <br />Some seepage exists at areas other than the drain outfalls, <br />or other designed drains No unexplained increase in <br />seepage All seepage is clear Seepage cond�GOns <br />observed do not currently appear to threaten the safery of <br />the dam <br />POOR <br />Conddions observed m this area appear to threaten the <br />safety of the dam <br />POOR <br />Seepage condmons observed appear to threaten the safery <br />of the dam Examples <br />1) Designed drain or seepage flows have increased wdhout <br />increase m reservoir level <br />2) Drain or seepage 8ows contam setliment, i e, muddy <br />water or paRicles in �ar samples <br />3) Widespread seepage, concentrated seepage, or <br />ponding appears to threaten the safety of the dam <br />CONDITIONS OBSERVED - APPLIES TO MONITORING <br />ACCEPTABLE <br />Monitoring includes movement surveys and leakage <br />measurements for High and Signdicant hazard dams, <br />leakage measurements for Low hazard dams <br />Instrumentation is in serviceable condition A plan for <br />mondonng mstrumentation is in effect by owner Penodic <br />inspechons by owner or representatrve OR, NO <br />MONITORING REQUIRED <br />POOR <br />All instrumentation and monitonng descnbed under <br />"ACCEPTABLE" here for each class oF dam, are not <br />prowded, or required penodic readings are not be�ng made, <br />or unexplained changes in readmgs are not reacted to by <br />the owner <br />CONDITIONS OBSERVED - APPLIES TO MAINTENANCE AND REPAIR <br />GOOD <br />Dam appears lo receive eHectwe on-going maintenance <br />and repa�r, and only a few minor dems may need to be <br />addressed <br />SATISFACTORY <br />The safery inspecGon indicates no conddions that appear to <br />chreaten the safety of the dam, and the dam is expected to <br />pertorm satisfactonly untler all design loadmg conddions <br />Most of the reqwred monitonng is be�ng performed <br />FULLSTORAGE <br />Dam may be used to full capaaty with no contlitions <br />ar.ached <br />H�gh hazara <br />Loss of human life is expected in ihe event of fadure of the <br />dam wh�le the reservo�r is at the high water hne <br />ACCEPTABLE <br />Dam appears to receive maintenance, but some <br />maintenance items need to be addressed No ma�or <br />repairs are requirecl <br />OVERALL CONDITIONS <br />CONOITIONALLY SATISFACTORY <br />The safety inspecUon indicates symptoms of structural <br />distress (seepage, evidence oi mmor displacements, etc ), <br />which, if conditions worsen, could lead to the failure of the <br />dam Essential monitonng, inspection, and maintenance <br />must be performed as a requirement for continued full <br />storage in the reservoir <br />SAFE STORAGE LEVEL <br />CONDITIONAL FULL STORAGE <br />Dam may be used to full storage if certain monitoring, <br />mamtenance, or operatwnal condihons are met <br />HAZARD CLASSIFICATION OF DAMS <br />Significant hazard <br />Significant damage to improved property is expected in the <br />event of failure of the dam while the reservoir is at the high <br />water line, but no loss of human life is expected <br />POOR <br />Dam does not appear to receive adequate maintenance <br />One or more dems needing mamtenance or repau has <br />begun to threaten the safety of the dam <br />UNSATISFACTORY <br />The safety inspechon indicates definite signs of structural <br />distress (excessroe seepage, cracks, slides, sinkholes, <br />severe deterioraUOn, etc ), which could lead to ihe failure of <br />the dam if the reservoir is used to full capaaty The dam �s <br />�udged unsafe for full storage of water <br />RESTRICTION <br />Dam may not be used to full capacity, but must be <br />operated at some reduced level in the interest of public <br />safery. <br />Low hazard <br />Loss of human hfe is not expected, and damage to <br />improved property is expected to be small, in the event <br />of failure of the dam while the reservoir is at high water <br />fine <br />NPH hazard - No loss of life or damage to improved property, or loss of downstream resource is expected in the event of failure of <br />the dam wh�le the reservoir �s at the high water line <br />Page 4 of 4 <br />