Flooding

Hydrographs

HARP1	BMBP1	CPHP1	DANP1
HGSP1	HTVP1	LNCP1	LWBP1
MRTP1	SBYP1	SDMP1

Surface Plots

Surface Plot June 23, 2006	Surface Plot June 24, 2006	Surface Plot June 25,  2006	Surface Plot June 26, 2006
Surface Plot June 27, 2006	Surface Plot June 28, 2006	Surface Plot June 29, 2006

Rainfall Reports Table

Rain Reports Maps

24 Hour Precipitation June 23	24 Hour Precipitation June 24	24 Hour Precipitation June 25	24 Hour Precipitation June 26
24 Hour Precipitation June 27	24 Hour Precipitation June 28	24 Hour Precipitation June 29	24 Hour Precipitation June 30

Hydrologic Impacts

Heavy rain associated with a stalled frontal boundary and the remnants from a weak tropical system affected the CTP Hydrologic Service Area (HSA) for about a week. Flooding came in several waves, with one round of Flash Flooding on Sunday June 25th, a second round of Flash Flooding and the onset of river flooding on the 26th, then significant widespread Flash Flooding and River Flooding on the 27th . Flooding from smaller streams and creeks subsided on the 28th , but River flooding persisted until the morning of July 1st .

Because of the nature of the rainfall, Flash Flood warnings were issued several times for many CTP counties. Flood waters would recede, only to once again rise with the next batch of heavy rain. A widespread rainfall during Tuesday and Tuesday night with the remnants of a weak tropical system (that was never a tropical depression or cyclone) ended the event.

River Flood Warnings were issued for several smaller Susquehanna tributaries on June 25th, only to be cancelled later when the first round of heavy rain was less widespread than originally expected.

A majority of the River Flood Warnings were issued on the 27th. Again, these were well in advance of any flooding. During the afternoon of the 27th, significant upward revisions to existing flood warnings were made. This was based on the inclusion of much higher and widespread QPF Forecasts than previously incorporated into the river model. Ultimately, the areal extent of the heavy rainfall was lower than projected, and shifted eastward by 50 to 75 miles. This shift brought considerably less rain (and hence runoff) into the West Branch and Chemung basins, which feed into the Main Stem Susquehanna. This made considerable differences in the hydrologic forecasts (lowered) for the Main Stem Susquehanna River in the CTP HSA, and updated forecasts were issued.

Even with the downward revisions, Moderate, Major and even Record category flooding was observed at 11 of the 12 CTP forecast locations which did flood. (Harrisburg only reached the Minor Flooding category). Hershey on Swatara Creek recorded a new record stage of 16.12 feet on the 29th. The old record was 15.4 feet set in 1975 due to the Remnants of Hurricane Eloise. It should be noted, however, that records at Hershey began after Hurricane Agnes, and anecdotal accounts rate that flooding as higher than the current event.

At this time there appear to have been no deaths in the CTP HAS related to flooding. However, several fatalities were being investigated as possible flood related deaths.

Widespread damage was noted throughout the eastern third of the CTP HSA, and throughout all of Eastern Pennsylvania. This included a number of washed out roads and bridges, as well as numerous water rescues.

• Some preliminary highlights of actions taken in Pennsylvania, and damages incurred:
• The Governor signed a Declaration of Disaster Emergency on June 28, 2006 due to widespread flooding, and extensive damage to public and private property in the 46 counties of Adams, Armstrong, Bedford, Berks, Blair, Bradford, Bucks, Carbon, Centre, Chester, Clinton, Columbia, Cumberland, Dauphin, Delaware, Franklin, Fulton, Huntingdon, Indiana, Jefferson, Juniata, Lackawanna, Lancaster, Lebanon, Lehigh, Luzerne, Lycoming, Mifflin, Monroe, Montgomery, Montour, Northampton, Northumberland, Perry, Philadelphia, Pike, Potter, Schuylkill, Snyder, Sullivan, Susquehanna, Tioga, Union, Wayne, Wyoming, and York.
• On June 30, 2006, President Bush declared a major disaster, and authorized Public Disaster Assistance under the Robert T. Stafford Relief and Emergency Assistance Act. The declaration was for eight (8) counties for the period beginning June 23, 2006 and including the Counties of Bradford, Bucks, Columbia, Luzerne, Northampton, Northumberland, Susquehanna and Wyoming for debris removal and emergency protective measures, including direct Federal assistance.
• On July 4, 2006, President Bush designated Monroe, Schuylkill, Susquehanna, Wayne and Wyoming counties for individual disaster assistance, qualifying residents and businesses in those counties for Individual Assistance. On July 5, 2006 President Bush added Berks, Bradford, Chester, Luzerne and Pike counties to the list of counties approved for individual assistance. This brings to ten the total of Pennsylvania counties approved
• In all, 204 Municipal disaster declarations, within 28 Pennsylvania Counties, were received by the State Emergency Operations Center (EOC).
• During the event, 15 counties issued evacuation orders (Adams, Berks, Bradford, Bucks, Carbon, Columbia, Cumberland, Lackawanna, Luzerne, Monroe, Schuylkill, Snyder, Susquehanna, Perry and Wayne).
• Army National Guard conducted 484 air rescue missions.
• As of July 4, 2006, 94 roads remained closed in 14 counties. 65 bridges were listed as damaged, or out, in 10 PA counties. Total bridge replacement is required in 23 instances.
• American Red Cross - Since the start of operations at least forty eight (48) shelters were operational, housing more than 2,500 people. All of the shelters have been closed. To date, Red Cross has assigned at least 173 vehicles, including Emergency Response Vehicles (ERV) and additional trucks from multiple states to assist affected areas. ARC has provided nearly 77,000 meals and snacks through 60 fixed and mobile feeding sites.

• Locally:
• Lancaster County - 36 water rescues performed
• Schuylkill County - The Lower Owl Creek Dam in Tamaqua Borough was determined to be eroding. The Department of Conservation and Natural Resources (PA DCNR) began drawing down the dam.
• Snyder County - A landslide closed State Route 104 in Perry Township. No injuries were reported.
• A propane release occurred when a cylinder was discovered floating in the Swatara Creek.

Summary of River Flooding

• 12 Forecast locations exceeded Flood Stage
• 1 location experienced Minor Flooding
  • Harrisburg
• 7 locations experienced Moderate Flooding
  • Marietta, Lancaster, Camp Hill, Sunbury, Danville, Hogestown, and Shermansdale.
• 3 locations experienced Major Flooding
  • Bloomsburg, Middletown, and Harper Tavern.
• 1 location experienced Record Flooding
  • Hershey (gage installed after Agnes, just before Eloise).

Summary of Flash Flooding

• 20 of CTP's 33 counties reported Flash Flooding. With the rainfall occurring in several waves (June 25, June 26 and June27-28), numerous counties had multiple Flash Flood Events.
• Adams, Clearfield Columbia, Cumberland, Dauphin, Franklin, Juniata, Lancaster, Lebanon, McKean, Montour, Northumberland, Perry, Schuylkill, Snyder, Sullivan, Somerset, Tioga, Union and York