HomeMy WebLinkAboutgr00090_000046_pg037February 21, 1978 Page 2
Administrator Achen reported that again in June, 1977, heavy rains
caused flooding problems in Mounds View. As a result, on August 8,
1977, the City Council ordered a feasibility study on implementation
of the drainage plan for the entire city. Several meetings with the
City Council, consulting engineers, financial advisors, city attorney
and staff followed in October and November, 1977. On November 28,
1977, the City Council formally received the feasibility study for a
city -wide storm sewer improvement project and set a public hearing for
February 21, 1978. Administrator Achen made a slide presentation of
water problems that had occurred after the heavy rains, showing
locations around the city that were under water.
Roger Short, of Short, Elliott, Hendrickson, introduced Don Christopherson,
the project engineers, Jerry Sunde, the consulting hydrologisg, and
Dick Moore, an engineer, and stated that they had begun working on the
project in November, 1975, and that part of the contract had stated
that the study was to be one of ground water control, as well as a
study of surface water drainage.
Mr. Short stated that the plan his firm has presented to the city uses
a five year storm design, which means that the storm sewers will be
constructed to handle a storm of the size that is likely to occur
once every five years. Existing drainage facilities in Mounds View
are of inadequate capacity to carry storm water runoff from even a
three year frequency storm. The proposed drainage project would accommo-
date full residential, commercial and industrial development of the
city, and would provide a trunk system that could be expanded as
needed when new homes or businesses were constructed on presently vacant lands.
Mr. Short reported that virtually all of the city drains to Rice Creek
with most of the drainage entering the Creek upstream of Long Lake.
Project 1978 -1 would redistribute the drainage so that a major portion
enters Rice Creek via Spring Creek, which is downstream from Long Lake.
This feature would reduce runoff pollution of the lake and is an impor-
tant element in the Rice Creek Watershed District's attempt to improve
the quality of Long Lake.
The three existing outflow points to Rice Creek are all to be expanded,
with a second 54 inch pipe to be installed at the existing Hillview
& I -35W outlet. On Co. Rd. H east of Edgewood Dr. a 48 inch line
will serve as the primary outlet, and at Spring Creek the existing
36 inch pipe under Co. Rd. H will be paralleled with a 48 inch line.
Detention basins are planned in several areas to limit ponding during
heavy runoff periods to specially designed sites. The largest basin is
to be located north of the Scotland Green Apartments on Co. Rd. H -2,
which will detain up to 93 acre feet of storm water and is designed to
be part of Silver View Community Park. The second largest basin with
85 acre feet capacity is planned north of New T.H.10 on Judicial DitchNo. 1 .
Mr. Short reported that the project is proposed to be constructed in
three phases during the 1978, 1979 and 1980 construction seasons. Phase I
would include the detention basin north of Scotland Green Apartments,
which will drain southward via a pipe along Silver Lake Road to
Woodcrest Drive and then westward to Spring Creek at Knollwood Drive.
Spring Creek will be cleaned to handle increased capacity and its outlet
to Rice Creek improved. A 60 inch pipe will extend north of the Scotland
Green detention basin, cross existing Highway 10 at County Road I, and