CCP 05-10-1999 - Laserfiche WebLink

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I .. I I I I I I II I I I I I I I , I * Another possible mitigation measure for this problem is to line the channel with concrete or other solid material which would promote better flow through the section that floods, This alternative would be very expensive and the channel would still require periodic maintenance to remove sediment and debris, All proposed mitigation measures would create a large disturbed area as a result of the excavation as well as just accessing the ditch behind the houses, A more detailed review of the tributary drainage area, ditch grades/sections and yard contours will be required prior to generating a construction contract for the work. The cost estimate included in this report assumes ditch excavation in the vicinity of 1519 McClung Drive and restoration associated with the work. Improvements upstream are not included in the estimate. Siems Court Problem Storm water runoff from Ridgewood Court over tops the bituminous curb at the end of the cul- de-sac and flows through the backyard of the residence at 3520 Siems Court, Although no severe erosion has taken place the resident states that they are unable to plant a garden, trees etc, on the slope because the plantings will wash away, Currently there is an improvised drain on the end of the Ridgewood Court that is undersized and unable to handle storm runoff, There is an existing catch basin located near the bottom of the slope that drains under Arden Place directly to Lake Johanna, The catch basin and outlet were apparently installed in 1991 or 1992 according to drawings reviewed by BRW, Potential Mitigation Measures * A catch basin could be constructed at the end of Ridgewood Court and piped to the existing catch basin located near the bottom of the hill. A curb would also have to be constructed to direct runoff from Ridgewood Court, into the proposed catch basin, This solution would likely require a drainage easement in the resident's yard as well as the property at 1653 Arden Place, for installation and maintenance of the pipe, * The problem could also be addressed by the incorporation of storm sewer facilities in the neighborhood as a part of future roadway reconstruction. This approach would allow the City to construct a catchbasin at the end of Ridge wood Court as necessary but would allow several other options for routing of the drainage pipe possibly to a regional ponding site next to Lift Station #3 or to the wetland east of Ridgewood Road, The first measure may be cheaper initially however it would direct more runoff from City streets directly into Lake Johanna, which is an undesirable in terms oflake water quality, The reconstruction schedule of Arden Place, Siems Court and Ridgewood Court will be determined as a part ofthe comprehensive street condition review to be accomplished this spring, The cost estimate included in this report reflects the first potential mitigation measure describe above, 6