Laserfiche WebLink
WETLAND DEFINITION <br />� According to the 1987 U.S. tlrmy Corps of Engineers "Wetlands Delineation vlanual" (1987 <br /> Vlanual; the document used by a11 delineators to define wetlands) a wetiand is "Those areas that <br /> i are inundated or saturated by surface or ground �vater at a frequency and dtaration sut�ticient to <br />' supporE, and that under normaf circumstances do support, a prevalence of vegetation typically <br /> adapted for life in saturated soii conditions." Tiie Minnesota State �Vetland Conservation �ct <br />' Rules, Chapter 8�20, fuither clarifies tl�at "...�vetlands must: (t) have a predomii�ance of hydric <br />� <br />� soils; {2} be initndaked or saturated by surface �vater or groundwater at a frequency and duration <br /> sut�icient to support a prevalence of hydrophytic vegetation typically adapted for life in saturated <br />' soil conditions; and (3) undec• normal circumstances, support a prevalence of hydrophytic <br />� <br /> vegetation." The 1987 U.S. Army Corps of Engineers vianual in Part lf, item 24. states that, <br /> i "The interactior� oP hydrology, vegetation, and soil results in tl;e development of characteristics <br />' unique to weTlands. "Cherefore, the foiio�ving technical guidelines for�vetlancis a�•e based on ttte <br />� three parameters, and diagnostic environmental characteristics used in applying the technical <br /> guideline are represented by various indicators of these parameters." It is titis premise by �vliich <br /> SER ecologists has, in their professional judgment, delineated the wetlands on the subject parcel <br />; described in this repoct. <br /> Wetland Hydrology • <br />' The tnost important wetland criterion is hydrology. The presence and persistence of �vater <br /> influences the vegetation types and changes soil marpl�ology. Hydrology may 6e observed as <br /> standing water{inundation), or may be obseived as freestanding�vater within the soil pit ar auger <br /> hole (saturation) usually �vithin the upper 12 inches. This is �vhat would be considered primary <br /> hydcology indicators. Only one primary indicator is necessary to make the determination that <br /> wetland hydrology indeed eYists. The 1987 Corps V[anual also has a range of hydco[ogic zones <br />� establishecl based on pe��iod of inundation or saturation. These zones and the periods of <br />' in�mdation or satucation for each can be observed in Tabte 1 below. <br /> � <br /> Esce ted from the 1937�lanual, H drolo�ic Zones—Nontidal Areas <br /> Zone vame Duration Comments 1Vedaad or�1ot <br />� 1 Perminently Inundated �ppo�a Inundation>b.6 ft.mean Not(Aquatic F[abitat Zone,or Deep Water <br /> tivater de th Habitat} <br />� Semiperinane��tly To Nearly ��� inundatron defined as <br /> f I Permanentiy iimnd�ted Or <100% ��.6 feet mean�vater Wedand <br /> Saturated de th <br />; ��j Regularly Inimdated Or >�5-75% �Vetland <br /> i Saturated <br />` IV Seasonally Inundated Or <12.5- lVetl�nd <br /> Saturated 25% <br /> ��(any areas having these <br /> i►regularly Inundated or �Vetland(if hydro�hytic veg.and hydric <br /> V Saturated >5-12.5% hydrologic characteristics soils also present <br /> i are not�vetlands <br /> fntermittently Or Never Areas�vith these <br /> V� Inundated Or Saturated �5% hydrologic characteristics �Iot <br /> are not wetlunds <br /> l <br />€ <br />� A-1 <br /> i � <br /> i <br />� <br /> I <br /> � <br />( <br /> i <br />