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No. 1— Detention Ponds <br />Malntenanco Defoct Conditlons When Maintenance le <br />Componenl Noeded <br />Pond Berms <br />(Dikes) <br />Emar�ency <br />Overllow/ <br />Spillway end <br />Berms over 4 <br />Ieel In hci,yh�. <br />[mergency <br />Ovcrtluw� <br />Spillway <br />4 J� - _ <br />Sedlements <br />Piping <br />Any pah of berm which has setlled 4 <br />inches lower Ihan the deslgn <br />elevation. <br />II settlement is epparoM, measum <br />berm la Aet�rmine amount of <br />setllement. <br />Settling can bo an indication of mora <br />severo problems wilh the barm or <br />ou�lel works, A licensod civil <br />enqineer shoulA ba r.onsulled �o <br />determine lhe sourco of tho <br />setUcment. <br />Discernable wa�er Ilow �hrough pond <br />benn, Onc�oing erosion wilh potenlial <br />lor erosion to r.ontinuo. <br />(Recommend a Goeliiechnical <br />en,yineQr be c�lled in lo inspect anA <br />r,v2luale condilion nnd rocommend <br />repair of condilion. <br />Tree GrowUi Trea grow�h on emergency spi�lways <br />r,roales blocknge problems and may <br />cause failuro of Iho bcrm due to <br />uncontrollod oveAnppin�. <br />Tree grovAh un benns over 4 feal in <br />height may lead �o plping �hrough Ihe <br />b��rm which could le�d to IalWre of <br />lhe berm. <br />Piping I Discernablc waler Ilow Ihrough pond <br />bemi. Ongoinc� erosion wllh polan�ial <br />lor eroslon lo confnuc. <br />(Recommend n Goethechnical <br />enginenr be called in lo inspoct end <br />evaluale condilion and rocommand <br />repair ol condilion. <br />Emergency Only onn layor of rcek exists ebova <br />Overllowl nnlive soil m aroa five square leet or <br />Splllw�y largcr, or any exposur� of nalive soil <br />a� Ihe �op ol ou� �ow pe�h of spillway. <br />(Rl�rrap on Inside slopes need nol be <br />repl2ced.) <br />Erosion I SCP, "SIAC SIOpCS O( POnA� <br />Volcme V - Runol/ 1'reatmenf <br />Results Ezpocted When <br />Malntenance Is Perlormed <br />Oike Is buill beck lo'hc� design <br />elevation. <br />Piping olimin�ted. Erosion potential <br />resolved. <br />Trees should bo remnved. If root <br />system is small (base less th�n 4 <br />inches) Ihe rool syslom may be lefl in <br />placo. Othcrwi^e Iho rools shoulJ be <br />removeA and Iho bertn restored. A <br />licensed civll enylnenr shoiAd be <br />consulted for proper berm/splliway <br />ras�oralion. <br />Piping eliminaled. Eroslon potenlial <br />resolveA. <br />Rocks nnd ped deptli ere reslored to <br />design standards. <br />Augusf 2001 <br />� <br />