CCP 03-15-1999 - Laserfiche WebLink

Home Browse Search

I > I I I I I I Ie I I I I I I I f 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 relatively 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 we1l 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 cost 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 a sma1l drain on the end of the Ridgewood Court that is undersized and unable to handle storm runoff. There is an existing catchbasin located near the bottom of the slope, which drains under Arden Place directly to Lake Johanna. The catchbasin and outlet were apparently installed in 1991 or 1992 according to drawings reviewed by BRW. There is an existing twenty-foot sanitary easement through the Siems Court property in the approximate location of the runoff problem. Potential Mitigation Measures · A catch basin could be constructed at the end of Ridge wood Court and piped to the existing catchbasin 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 require a drainage easement in the resident's yard as we1l as the property at 1653 Arden Place, for insta1lation and maintenance ofthe pipe, unless the sanitary sewer easement could be utilized for both systems. · The problem could also be addressed with the incorporation of storm sewer in the neighborhood, as a part of a future roadway reconstruction program. This approach would allow the City to construct a catchbasin at the end of Ridgewood Court as necessary but would a1low 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 Ridge wood Road. The first measure may be cheaper initially however it would direct more runoff from City streets directly into Lake Johanna which, is undesirable in terms of water quality in the lake. The reconstruction schedule of Arden Place, Siems Court and Ridgewood Court will be determined as a part of the comprehensive street condition review to be accomplished this spring. 6