SNAP

Octoraro Creek at Richardsmere, Md.

Overview
  • Station Id: 01578475
  • County: Cecil
  • Drainage Area: 189 sq.mi.
  • Station Coordinates: 39.693°,  -76.125°
  • Period of record: 2006 to present
Location Description

Station is on the bridge 0.2 miles west of Richardsmere on Colora Road.

Data

2016 Land Use

Urban Agricultural Agricultural Forested Other
Row Crops Pasture/Hay Total
11% 41% 22% 63% 23% 3%
Site Drainage Area

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Clear
2019 Flow Normalized Trends
Trend period (Water Year*) 2007-2019
Trend & Direction NS – Not significant,  UP – Increasing trend,  DOWN – Decreasing trend
Hypothesis Test significance level (i.e. α) 0.1
* Water Year runs from October 1st to September 30th of the following year
Likelihood Descriptor Range of values**
HL (Highly Likely) ≥0.95 and ≤1.00 
VL (Very Likely) ≥0.90 and <0.95 
L (Likely) ≥0.66 and <0.90
ALAN (About as Likely as Not) >0.33 and <0.66
** Values represent the posterior mean estimate of the probability of a trend
Richardsmere 2007-2019 Flow Normalized Concentration (mg/L) Flow Normalized Load (Millions Kg/yr)
Likelihood Test Likelihood Test
Parameter Change Value Descriptor Trend Change Value Descriptor Trend
Total Nitrogen -0.730 0.87 L DOWN -0.081 0.74 L DOWN
Nitrate-Nitrite -0.661 0.85 L DOWN -0.059 0.62 ALAN NS
Ammonia -0.026 0.89 L DOWN -0.011 0.87 L DOWN
Dissolved Nitrogen -0.750 0.87 L DOWN -0.088 0.70 L DOWN
Nitrate-Nitrite -0.611 0.79 L DOWN -0.046 0.62 ALAN NS
Ammonia -0.022 0.85 L DOWN -0.011 0.85 L DOWN
Total Phosphorus -0.046 0.99 HL DOWN -0.013 0.83 L DOWN
Particulate Phosphorus -0.003 0.64 ALAN NS -0.002 0.66 ALAN NS
Dissolved Phosphorus -0.040 0.99 HL DOWN -0.009 0.91 VL DOWN
Orthophosphate -0.033 0.97 HL DOWN -0.007 0.81 L DOWN
Total Organic Carbon -0.795 0.99 HL DOWN -0.305 0.97 HL DOWN
Total Suspended Solids -2.758 0.72 L DOWN -2.811 0.70 L DOWN
Suspended Sediment 3.022 0.56 ALAN NS 3.020 0.58 ALAN NS