MCDD EMERGENCY PREPAREDNESS PLAN Multnomah County Drainage District No.1 (MCDD), Peninsula Drainage District No.1 (PEN1), Peninsula Drainage District No.2 (PEN2), and Sandy Drainage Improvement Company (SDIC) (Districts) levees and pumping facilities are designed to handle the modeled 100-year flood or rain event. The purpose of this plan is to prepare the Districts for a high water event on the Columbia River. During such an event it will be important for District Staff to be prepared to take actions that will keep the District levees and facilities functioning to protect life, property, and the environment. This plan will be implemented whenever a risk of flooding which could threaten the functioning and stability of the Districts occurs. It will remain in force until the Columbia River levels have receded below 23.5 feet for at least 24 hours and Columbia River levels are not forecast to rise above 23.5 feet. River Levels and Weather Service
Real time and forecast weather and river levels can be found at
http://www.nwrfc.noaa.gov/ The Vancouver Gauge on the Columbia can be found at
http://www.nwrfc.noaa.gov/river/station/flowplot/flowplot.cgi?VANW1 NOTE: The Vancouver Gauge uses Columbia River Datum. To convert to NGVD you need to add 1.82 Stage Event Water Elevations
Columbia River- Water Elevations (NGVD)
Stage 1: 18.0 to 23.5 10 year event
Stage 2: 23.6 to 25.8 50 year event
Stage 3: 27.4 to 28.9 100 year event
Stage 4: 29.0 and above 500 year event Lower Columbia Slough-Water Elevations (NGVD)
Stage 1: 18 to 21.8 10 year event
Stage 2: 21.9 to 25.8 50 year event
Stage 3: 25.9 to 27.5 100 year event
Stage 4: 27.6 to 32.2 500 year event Response to Columbia River Stages Stage 1: 18 to 23.5 feet 10 year event
MCDD field staff will make daily inspections of all levee systems and report back any and all conditions to the Incident commander. It is expected that at these river levels, all monitoring, surveillance, and reporting will be handled by MCDD staff. River and weather forecast will be checked daily. Stage 2: 23.6 to 27.3 feet 50 year event
EOC will be established at MCDD and 24 hour operation and surveillance will go into effect. MCDD will contact the United States Army Corps of Engineers (USACOE) and request the USACOE liaisons to be stationed at the MCDD EOC. Additional man power for levee monitoring may be requested from the City of Portland Water Bureau. Where possible the following positions will be staffed in three eight hour shifts. Duties of positions that are not staffed will be the responsibility of the Incident Commander. Depending on the size and duration of the event additional positions may be staffed from outside the Drainage District Staff. Staff members should be in the briefing room 1 hour prior to the start of their shift and for 1 hour after their shift for briefing. Shifts will be from 0600 hrs to 1400 hrs, 1400 hrs to 2200 hrs, and 2200 hrs to 0600 hrs.
Stage 3: 27.4 to 28.9 feet 100 year event
Areas of concern will have already been identified for all areas and surveillance will be increased for those areas. If an emergency has been declared by the Governor MCDD will request night time infer red aerial surveillance of the levees by the United States Army National Guard. River and weather forecasts will be checked daily. | 
