Agenda - 06-28-1989 - Laserfiche WebLink

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4 IMPLEMENTATION ISSUES I LAND USE ISSUES • It should be made clear that all jurisdictions don't have to adopt the same land use approach,but that there are three options,and that two of the options have associated requirements in addition to zoning. The following is a list of the options available to local governments: 1) Five acre minimum lot size zoning, with a 4%impervious surface limit; 2) Five acre cluster equivalent, which allows:half acre lots,provided that a 4% impervious surface limit is kept, an on-site structural BMP is provided to reduce the effect of pollutant slug loadings, and approximately 85%of the development maintained as permanent open space. (This option yields overall densities of between 3.3 acres per dwelling unit). 3) Existing land use plans with a 62 impervious surface limit(whether or not public water and sewer is available) for two acre lots and 12%impervious surface limits for one acre lots -- with structural starmwater BMPs (on-site or regional) provided for all developments. This option is recommended for use where either of the other two options are considered to be infeasible, and only if there is a publicly funded and operated program of effective inspection and maintenance of the stormwater BMPs. • If some local governments decide to go with the higher density/structural control option,who will take responsibility for the long-term performance of the structural BMPs? Will the structural BMPs be on-site or regional facilities? If on- site structures will be used, there should be some agreed-on design standards for those facilities. If regional BIvIP structures will be relied on, a BMP Master Plan will have to be prepared. Who will take the lead agency role in that effort? How will it be paid for? (see also Financing) • • Because impervious surface limitations are the key to the various land use approaches, the term "impervious surface"needs to be defined so that all jurisdictions are consistent in their regulation. Currently,Carrboro and Chatham County include gravel roads in their definition of impervious surfaces,and Orange County does not,for example. • The term "clustering"needs to be carefully used and defined,since each jurisdiction is likely to have a different definition of clustering in its ordinance, all of which may differ from the Study's recommendation. (The Study's definition calls for half acre lots, a maximum of 42 impervious surfaces, 85 of a development preserved permanently as open space, and an on-site structural stormwater BMP to reduce the effects of pollutant slug loadings). 3