Agenda Packets - 1980/05/22 - Laserfiche WebLink

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MliMU TU: PLANNING COMMISSION I FROM: MAYOR llATE: April 30, 1980 -/ RE: Wetland Preeervation This memo eummarizee my viewe at thie time on the isaues of preser- vation of wetlande and drainageways and the plan fos etorm water manage- ment propoaed by the Planning Commisaion (theae viewe are based to cone- iderable extent upon the Planning Commission report dated 2/11/80 and the input from citizene at the Mayor's Committee meeting held on April 1 th.) There ia no disagreement that it ie deaireable to preaerve wetlande, in general, and neceasary to prevent diatruction of wetlanda and drain- agewaye that are important to our exieting atorm drainage eystem. The moet practical means for such preaervation appears to be full utilization of governmental powere. In principal, Resolution 983 providea eignifi- cant protection by mandating that development cauae no economic burden to other property (interferettce with a drainageway, for example, obvioue- ly would cauee auch a burdenJ. However, it ia generally recognized that Resolution 983 neede to be expanded into ordinance form. We aleo need to be better informed as to Khat powers are available from other governmental unit. To thie ea3, Commiasioner Hamilton of Rice Creek Waterahed District has agreed to maet with us when requested. The queetion of eatabliahing new drainage facilitiea in anticipation of additional load on our etorm drainage ayetem from future development is a quite different and more contrnversial isaue. It has been euggeeted that euch additional load will come from two eourcea even where on-eite retention ar detention ia :equired in connection with future developmenL. One of theee sourcea is said to be runoff from nex streets. However, it hae been pointed out that developera have a"total aite" responaibility under Reaolution 983: that ie, high runoff from new atreeta muet be balan- ced by low runoff from the reet of the property ao that the total rate of runoff ie not changed by the development. In practice, auch a balance might not bt totally achievable rhere runoff before development ia very lox or naw etreet eurface area ie very large; in any euch caeee it might well be poeaible to divert flow from the etreets into local holding areae.