Baccharis Consulting LLC

Water Inundation in Dragon Run Watershed, Delaware (2002-2017)

Picture of Dragon Run

                                          Dragon Run from Clark’s Corner Road

Discussion of Dragon Run Watershed

This watershed covers the main stem, plus some Delaware River shoreline.  All tidal areas are active industrial as the shipping terminal for the Delaware City Refinery.  It is located between Red Lion Creek and the C and D Canal watersheds on the west side of Delaware River.  More information on the watershed can be found at this link.

Dragon Run is the southernmost of the riverine watersheds.  This means that precipitation events have an outsize influence on the inundation numbers.  For instance, you can have a heavy rainfall event in the upper Delaware River or its tributaries, the water will then flow into the main stem of the Delaware River causing it to rise.  There is not enough area for the water to spread out.  In these watersheds (riverine) it is best to look at the trends rather than the actual numbers.  This effect is only half expressed since it is only one side of the river.  The Delaware River is also larger here so there is more room for water to spread out, alleviating the effect.

Dragon Run Water Inundation (2002-2017)

 

Table 1. Dragon Run Watershed Tidal Water (2002-2017) in acres
Year Estuarine Coastal Oligohaline Water
2002 9.50
2007 8.72
2012 8.99
2017 9.36

ECOW = Estuarine Coastal Oligohaline Water (Salinity 0.5-5 ppt)

Table 1 shows an interesting story for Dragon Run.  The water level was highest in 2002 and then reduced to 2007.  Since 2007 the water level has increased, but not quite to the level it was in 2002.

Table 2. Average Rate of Dragon Run Watershed Water Inundation

(2002-2017) in acres/year

 Period  Average Rate (acres/year)
2002-2007 -0.16
2007-2012 +0.05
2012-2017 +0.07

Table 2 shows the water inundation rate regressed in the 2002-2007 period, but then very slightly increased in the 2007 to 2017 period.

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