MNN = máximo nivel normal

PDF] BOE 015 de 18/01/2000 Sec 3 Pag 2271 a 2283File Format: PDF/Adobe Acrobat - View as HTML
el volumen del embalse a 111 hectómetros cúbicos, ya que el nivel de. máximo nivel normal (MNN) del mismo, 1.051 metros sobre el nivel del ...
www.boe.es/boe/dias/2000/01/18/pdfs/A02271-02283.pdf

MNN = NWL = Normal Water level

[PDF] STATE OF VERMONT DEPARTMENT OF ENVIRONMENTAL CONSERVATION ...File Format: PDF/Adobe Acrobat - View as HTML
Surface area of impoundment in acres (A), at Normal Water Level. (NWL) and with water level at Top of Dam. h. Storage in acre-fee (AF). ...
www.anr.state.vt.us/dec/fed/DamSafety/docs/DamOrderInstruct...

MNC = máximo nivel en crecidas (I cannot find evidence of this in Google. I have gathered this information from the multilingual technical dictionary on dams)


MNC = MWL = maximum water level

[PDF] Chapter - 6 Design FeaturesFile Format: PDF/Adobe Acrobat - View as HTML
Using the above design flood hydrograph, the maximum water level (MWL) was. computed by carrying out flood routing for the reservoir. ...
nwda.gov.in/writereaddata/sublink2images/43.pdf


For future reference, I would also like to add that there is a FRL = full reservoir level (slightly less than the MWL)

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Note added at 43 mins (2006-09-06 11:52:26 GMT)
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Normal Water Level (NWL) – For a reservoir with a fixed overflow, means the lowest crest level of that overflow. For a reservoir whose outflow is controlled wholly or partly by movable gates, siphons or other means, it is the maximum level to which water may rise under normal operating conditions, exclusive of any provision for flood surcharge. For a closed depression wetland, it is the maximum level to which the water may rise under normal precipitation conditions exclusive of any provision for flood surcharge.

http://www.co.scott.mn.us/xpedio/groups/public/documents/web...


This ref contains a table with your context:

DOC] 1File Format: Microsoft Word - View as HTML
The elevation at river bed level and reservoir normal water level is 964 and 1120 m amsl, ... MWL = maximum water level, NWL = normal water level, ...
www.eeaecon.org/.../papers/Admasu Gebeyehu - The Role of La...