Agenda - 05-23-2005-w2 - Laserfiche WebLink

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31 City of Durhmn Stormwater Management for New Development -The City of Duxixam adopted a new Comprehensive Plan in 2005 to guide future development decisions. • The Unified Development Ordinance is a major overhaul of Durham's development regulations and defines a number of development tiers (feral, suburban, urban, downtovwx, compact) so that development in those areas will be appropriate, and provides for a minimum lot size of three acres in the rural tier. • City ordinances require dedication of both open space and recreation land for new residential developments, or a paylnent-in-lieu that is used for laird acquisition. The City also exacts an impact fee from new developments for recreation and open space; those fiords are used for land acquisition as well. • Development is limited from impacting natural slopes of 25% or greater. • Impervious surface limits and buffer requirements exceed state requirements in water supply watershed overlay zoning districts. Requirement State Min JorJan CA Stnte Min JorJnn ['A \V5-1 CA \VS-4 I'A Low Density Max 24% G'% 24% 24% built U on Aren High Density Max 50°/ 40'%i 70% 70'% Quilt U on Arca Low Density 30' 250 ft reservoir pool, 30' 150 ft perennial, Setback 150 ft perennial, 100 Ct intermitlent 100 ft intermittent nigh Density 100' 250 ft reservoir pool, 100' 150 ft perennial, Selbacit 150 Ct perennial, 100 ft intermittent 100 ft intermittent Riparian Buffer Protection -The City of Durham requires riparian buffers that exceed widths proposed for Jordan Lake and apply to both perennial and intermittent streams, streams appearing on either USGS or Soil Survey maps, with the more stringent designation controlling. • Citywide there is a minimum of 50 ft buffers, plus a 10 ft construction setback (60 ft total) applying to perennial streams, intermittent streams, alxd natural ponds and lakes. The inner 50 ft is to be natural, unmanaged vegetation in the rural and suburban tiers, but maybe landscaped in urban, compact and downtown tiers. • Much wider buffers apply in water supply watersheds. In the Jordan Lake Watershed, the buffer is 100 ft for intermittent and 150 ft for perennial streams, much wider than the state minimum for WS-IV PA and WS-IV CA (see map on page .3), • In addition to buffers that directly protect streams, most development in the 100-year floodplain is prohibited, which results in substantially expanding the width of the 50 ft minimum buffer in areas where the floodplain has been mapped, particularly in areas closer to .lordan Lake, • the City of Durhazn has been designated as a "Tree City" each year for more than fifteen consecutive years for- its preservation of trees. For residential development, the City requires tree coverage of between 20% and 25%. Forestry operations are largely exempt from local regulation under state law. To prevent developers from using the foreshy exemption as a basis of clearing city-required buffers, land cleared under the forestry