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Table V-4.5.2(1) Maintenance Standards - Detention Ponds (continued) <br /> Maintenance Conditions When Results Expected When <br /> Component Defect Maintenance Is Maintenance Is Per- <br /> Needed formed <br /> Settling can be an <br /> indication of more <br /> severe problems with <br /> the berm or outlet <br /> works.A licensed civil <br /> engineer should be <br /> consulted to determine <br /> the source of the set- <br /> tlement. <br /> Discernable water flow <br /> through pond berm. <br /> Ongoing erosion with <br /> potential for erosion to <br /> continue. <br /> Piping eliminated. Erosion <br /> Piping (Recommend a Goeth- potential resolved. <br /> echnical engineer be <br /> called in to inspect and <br /> evaluate condition and <br /> recommend repair of <br /> condition. <br /> Tree growth on emer- <br /> gency spillways cre- Trees should be removed. <br /> ates blockage If root system is small <br /> problems and may (base less than 4 inches) <br /> cause failure of the the root system may be left <br /> berm due to uncon- in place. Otherwise the <br /> Emergency Over- Tree Growth trolled overtopping. roots should be removed <br /> flow/Spillway Tree growth on berms and the berm restored. A <br /> and Berms over 4 over 4 feet in height licensed civil engineer <br /> feet in height may lead to piping should be consulted for <br /> through the berm proper berm/spillway res- <br /> which could lead to fail-toration. <br /> ure of the berm. <br /> Discernable water flow <br /> Piping through pond berm. Piping eliminated. Erosion <br /> Ongoing erosion with potential resolved. <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 832 <br />