SNAP

West Conewago Creek near Manchester, Pa.

Overview
  • Station Id: 01574000
  • County: York
  • Drainage Area: 512 sq.mi.
  • Station Coordinates: 40.081°, -76.718°
  • Period of record: 10/84 to 12/89 & 10/04 to present
Location Description

Station is located at the Route 181 bridge and gage is located north bank 500 feet upstream of Route 181 bridge.

Data

2016 Land Use

Urban Agricultural Agricultural Forested Other
Row Crops Pasture/Hay Total
15% 26% 23% 49% 32% 5%
Site Drainage Area

Please select a parameter from the list to view graphs of loads and concentrations. You may need to scroll down to view graphs.

Clear
2019 Flow Normalized Trends
Trend period (Water Year*) 2005-2019
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
Manchester 2005-2019 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 -0.539 0.99 HL DOWN -0.294 0.99 HL DOWN
Nitrate-Nitrite -0.673 0.99 HL DOWN -0.379 0.99 HL DOWN
Ammonia 0.006 0.68 L UP 0.013 0.89 L UP
Dissolved Nitrogen -0.588 0.99 HL DOWN -0.317 0.99 HL DOWN
Nitrate-Nitrite -0.635 0.99 HL DOWN -0.342 0.99 HL DOWN
Ammonia 0.007 0.75 L UP 0.012 0.89 L UP
Total Phosphorus 0.004 0.54 ALAN NS 0.003 0.62 ALAN NS
Particulate Phosphorus 0.002 0.54 ALAN NS -0.001 0.60 ALAN NS
Dissolved Phosphorus 0.003 0.52 ALAN NS 0.006 0.52 ALAN NS
Orthophosphate 0.003 0.56 ALAN NS 0.007 0.50 ALAN NS
Total Organic Carbon -0.460 0.89 L DOWN -0.639 0.89 L DOWN
Total Suspended Solids 1.735 0.58 ALAN NS -10.547 0.81 L DOWN
Suspended Sediment 1.955 0.54 ALAN NS -16.038 0.91 VL DOWN