05/08/1995 Council Packet - Laserfiche WebLink

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Ms. Mary Kay Wyland April 20, 1995 Page 6 Page 3, Paragraph 2 To summarize: The water run-off from the eastern half of the project located on the south side of Holly Drive West impacts adjacent landowners by potentially allowing sus face water to run off-site and to act like a natural floodgate --- resulting in ponding areas on their properties which were previously nonexistent. The adjacent landowners will lose the present and also future use of their properties. Discharge rates from the development will be maintained at rates at or below the discharge rates from the site under undeveloped conditions. The site has been utilized for the cultivation of row crops. Development of the site for residential use will increase the areas of impervious surface within the parcel. However, the maintenance of residential lawns and use of storm water treatment ponds will serve to reduce the rate of runoff from the site. Page 3, Paragraph 3 The nearby roadway, Holly Court East, located south of the project presently has a small culvert beneath the pavement to allow for water drainage. At the present time it is of insufficient size to handle all the water movement beneath the road and pools and overflows on the north side. One portion of the street in particular is consistently under water any time it rains. With the additional water run-off from this project the road has the potential to be completely flooded or even washed mit. The use of storm water ponds for flood storage and rate control will limit the rate of discharge from the proposed development to those rates experienced under undeveloped conditions. Runoff from the site will not contribute to existing flooding problems in the area. Page 3, Paragraph 4 Pond #6 in the far southwest corner of this project collects excess water from Road B & C and then drains through a culvert beneath Holly Drive West into the wetland area adjoining County Ditch #25. The property owner at 6275 Holly Drive West has his septic drainfield approximately 200 feet from that culvert location and is concerned that the excess rim -off from this project will ruin his existing drainfield. 1 f his drainfield is infiltrated by this proposed water increase, and as a result it fails - it has the potential to contaminate County Ditch #25 which is on the DNR Protected Waters Inventory List. Water from Pond 6 will discharge under Holly Drive West into Basin A at rates at or lower than discharge rates under undeveloped conditions. It is unlikely that surface water will infiltrate the drainfield which is approximately four feet higher than the elevation of the culvert. Page 3, Paragraph 5 Presently, County Ditch #25 is a marginal ditch that overflows every spring for weeks or from any heavy rainfalls. With the zoater table rising from surface water run-off of this project, this ditch has the potential to be constantly flooded by even the slightest rain. One suggestion is that this ditch will possibly require some major cleaning and modifications to accommodate the additional water. Discharge rates from the proposed development will be maintained lower than those under undeveloped conditions minimizing the flood potential in County Ditch #25 and downstream.