Home Archived February 7, 2019
Site Information
01400350   Macs Brook at Somerville, NJ
Location:Latitude 40�'56", Longitude 74�'05", Somerset County, Hydrologic Unit 02030105, on left upstream wing wall of culvert under access road from U.S. Highway 22 West to U.S. Highways 202 and 206, 1,200 ft upstream from Peters Brook, and 0.4 mi north of So
Drainage Area:Continuous Period of Record:RemarksSite Type:Baseline Period of Record:Baseline Quality
0.771982-1995Some regulation from detention pond directly upstream.D1982-1992POOR

Hydrologic Indices
Flow RegimeFlow EventIndex NameIndex Value
Index Type
Average FlowSurrogate for25th Percentile*Value75th Percentile*
Temporal MA10.171.520.96
Temporal MA20.170.370.96
Temporal MA3171.19279.99334
Spatial MA419.2-147.2565.72
Spatial MA51.274.112.47
Spatial MA66.2235.4451.29
Spatial MA72.949.1410.86
Spatial MA82.365.657
Spatialb MA9MA390.41-3.592.55
Spatial MA100.27-2.231.69
Spatial MA110.21-1.741.41
Temporal MA120.831.522.43
Temporalbc MA13MA391.111.612.19
Temporal MA141.251.673.51
Temporal MA150.592.033.37
Temporal MA160.430.882.83
Temporal MA170.530.791.23
Temporal MA180.380.921.65
Temporal MA190.190.841.17
Temporal MA200.350.591.26
Temporal MA210.190.360.92
Temporal MA220.561.121.99
Temporal MA230.51.132.75
Temporal MA24131.65172.22222.36
Temporal MA25100.54137.23188.13
Temporal MA26116.94132.09211.73
Temporal MA27110.18163.25228.83
Temporal MA28127.34149.83215.47
Temporal MA29112.95176.46271.6
Temporal MA30134.97168.58298.38
Temporal MA31147.32209.8252.88
Temporal MA32174.03218.33290.95
Temporal MA33159.94183.85237.63
Temporal MA34166.9238.22299.35
Temporal MA35102.82179.91221.38
Spatial MA363.2206.47
Spatial MA370.8501.58
Spatial MA381.4802.77
Spatiala MA3952.34NC 91.65
Spatialb MA40MA390.1700.33
Temporal MA411.16NC 2.35
Spatial MA420.90.921.23
Spatial MA430.310.570.48
Spatialb MA44MA390.7NC 0.93
Spatial MA45-0.02NC 0.03
Low Flow
Temporalc ML10.10.180.27
Temporalc ML20.180.290.37
Temporalc ML30.20.320.47
Temporalc ML40.170.350.66
Temporalc ML50.120.190.35
Temporalc ML60.090.140.2
Temporalc ML70.030.110.16
Temporalc ML80.040.110.16
Temporalc ML90.040.080.13
Temporalc ML100.040.080.12
Temporalc ML110.090.130.22
Temporalc ML120.120.160.26
Temporalb ML13ML2054.09448.5598.78
Temporal ML1400.090.23
Temporalbc ML15ML2000.030.08
Temporal ML1600.090.23
Temporal ML170.020.040.06
Spatial ML1841.5979.5794.03
Temporal ML1902.365.85
Spatiala ML200.320.160.69
Spatialb ML21ML2041.73103.29104.03
Temporal ML2200.030.12
High Flow
Temporalb MH1MH164.513.517.75
Temporalbc MH2MH164.511.517
Temporalb MH3MH167.7514.526.25
Temporal MH44.613.537
Temporal MH53.158.824
Temporal MH62.57.7515.25
Temporal MH73.587.0524.25
Temporal MH81.555.813.25
Temporal MH92.955.9514.25
Temporal MH101.254.759.38
Temporal MH117.6813.524
Temporal MH122.9511.0524
Spatial MH1384.29-448.56121.17
Temporal MH1457.2589.68136.34
Spatial MH155.2251.3525.88
Spatiala MH162.538.625.3
Spatial MH171.582.62.38
Spatial MH188.7617.4814.44
Spatial MH19-0.19-0.080.72
Temporal MH2024.6851.379.87
Temporalb MH21MH1629.9442.3146.52
Temporal MH2222.4431.7135.08
Temporal MH2323.3931.8936.49
Temporal MH242.4718.6421.28
Temporal MH256.2223.3629.73
Temporal MH2611.5531.0337.84
Temporal MH275.1422.1426.76
Index Type
Low FlowSurrogate for
Spatialbc FL1FL38.251519.75
Spatialb FL2FL339.0463.1163.45
Temporala FL30610.25
High Flow
Temporal FH125.753235.5
Spatial FH220.5525.4934.68
Temporalac FH351.7580.593.25
Temporal FH423.754750.25
Temporalb FH5FH32327.532.75
Temporal FH6253136.5
Temporal FH719.2523.528.5
Temporal FH825.753235.5
Temporalb FH9FH38.251620.75
Temporalb FH10FH311.56
Temporalb FH11FH3022.25
Index Type
Low FlowSurrogate for
Temporal DL100.030.09
Temporal DL20.010.050.09
Temporal DL30.020.060.1
Temporalac DL40.060.110.29
Temporal DL50.360.590.82
Spatial DL641.73103.29104.03
Spatialb DL7DL438.3689.6198.59
Spatial DL836.6485.9990.53
Spatial DL935.1789.4578.06
Spatial DL1034.3650.2877.84
Temporalb DL11DL400.130.24
Temporal DL120.040.180.27
Temporal DL130.170.460.77
Temporal DL140.320.460.64
Temporal DL150.10.240.43
Temporalb DL16DL43.584.296.75
Spatial DL1737.3651.6871.88
Temporal DL18002.75
Spatial DL19NC 232.46NC
Spatial DL20NC 4.76NC
High Flow
Temporal DH11939.561.5
Temporalbc DH2DH149.6518.8323.96
Temporal DH36.310.5813.94
Temporal DH42.694.376.68
Temporal DH51.612.743.9
Spatial DH641.2659.4860.21
Spatial DH736.8660.2757.76
Spatial DH837.1351.549.05
Spatial DH931.4745.9640.45
Spatial DH1029.8942.7637.96
Temporal DH1151.35110.81166.22
Temporalb DH12DH1417.0429.237.69
Spatial DH137.2812.3818.05
Spatiala DH140.0600.32
Temporal DH151.772.873.73
Spatial DH1633.9335.1969.21
Temporalb DH17DH143.646.319.52
Temporal DH181.672.413.15
Temporal DH191.391.782.1
Temporal DH201.772.873.73
Temporal DH216.9416.9928.63
Temporal DH22554.574.5
Temporalb DH23DH14224
Temporal DH2450107.5143.75
Index Type
Average FlowSurrogate for
Spatial TA10.170.60.44
Spatial TA235.9771.261
Spatial TA30.270.30.41
Low Flow
Spatiala TL1241.02240.2266.87
Spatial TL234.142.3844.78
Spatial TL30.430.240.59
Spatial TL40.010.110.11
High Flow
Spatial TH130.9876.34111.47
Spatialb TH2TH362.7177.174.66
Spatiala TH30.140.20.32
Rate of Change
Index Type
Average FlowSurrogate for
Temporalb RA1RA70.070.482.45
Spatial RA2187.13238.14274.94
Temporalb RA3RA7-0.58-0.11-0.03
Spatial RA4-372.11-327.39-184.77
Spatial RA50.240.280.27
Temporalb RA6RA70.220.751.83
Temporalac RA7-0.74-0.29-0.14
Temporalb RA8RA7117.5128.5140.5
Spatial RA97.1722.8712.75

a primary index as determined from the New Jersey Hydrologic Integrity Assessment Process (Henriksen and others, 2006; Kennen and others, 2007)
b surrogate index as determined from the New Jersey Hydrologic Integrity Assessment Process (Henriksen and others, 2006; Kennen and others, 2007)
c primary regulatory index for the New Jersey Department of Environmental Protection (J.L. Hoffman, NJDEP, written commun., 2007).

# indicates that site is an index station

* If the index is spatial, percentile values are from the distribution of values for the selected index for all sites of the same stream type if the index is spatial

** These sites are index sites, which are considered to be relatively undeveloped (least amount of urbanization, less than 15% urban landuse) for a long period of record (at least 50 years). The entire period of record for these sites are considered baseline.

NC value could not be calculated