2012 Physical Data

PHYSICAL ASSESSMENT 1 by Tim Schutz, Emily Bierman, and Justin Witherspoon.

Transect #1 (upstream) Interval Width (feet) Depth (feet)
A to B/ At B 11 .607
B to C/ At C 11 2.5
C to D/ At D 11 1.833
D to E/ At E 11 1.416
Totals 44 6.356
Avg. 11 1.589

Total width (ft) X Avg. depth (ft) = avg cross-sectional area

44 X 1.589 = 69.916
Transect #2 (downstream) Interval Width (feet) Depth (feet)
A to B/ At B 10.5 3.25
B to C/ At C 10.5 3.67
C to D/ At D 10.5 3.73
D to E/ At E 10.5 3.75
Totals 42 14.40
Avg. 10.5 3.604

Total width (ft) X Avg. depth (ft) = avg cross-sectional area

42 X 3.604 = 151.368

Cross-sectional area of Transect #1 +Cross-sectional area of Transect #2 ÷2 = Avg. Cross-sectional area

(69.916+151.368)/2= 110.642 Sq. Ft.

L: Length of Stream Reach

20 ft.

 C: Coefficient

.9 ft

Flow = ALC/T = (110.642 x 20 x .9)/300 = 6.639

 

PHYSICAL ASSESSMENT 2 by Ransom Pate & Katie Reiter-Lavery

New Hope Creek 7/24/12 9:45 AM

Weather (past 24 hours): storm with heavy rain

Weather (at time of recording): clear and sunny

Water Temperature: 78°F

Turbidity Readings:  10 cm, 20 cm, 40 cm; Average = 23.33 cm.  The differences in readings can be explained by disturbed sediments in the water when it was collected in the tube.

Water Odors: Normal

Water Color/Appearance: Brown/Muddy

Algae Growth: Minimal

Professionally Drawn Diagram of Setup (not to scale)


Flow Data: Time for objects to travel downstream

Trial 1

Trial 2

Trial 3

Average

Time (sec)

300

N/A

N/A

300

Distance and Calculations of stream flow

Interval 1

Interval 2

Width (ft)

Depth (ft)

Width (ft)

Depth (ft)

Point A to B

11

0.667

10.5

3.250

B to C

11

2.500

10.5

3.667

C to D

11

1.833

10.5

3.250

D to E

11

1.500

10.5

3.750

Sum

44

6.500

42

13.917

Average Depth (ft)

1.625

3.479

Area (ft2)

Width*Average Depth

(Area1) 71.500

(Area2) 146.125

Average Area (ft2)

Area1+Area2/2

108.8125

Length of Stream Reach (ft)

Measured

20

Coefficient

0.8

Flow (ft3/sec)

5.803

The coefficient was given for rocky-bottom streams in the pre-observation materials.

Measurements were taken to determine turbidity (how clear water is), water temperatures and the stream flow. To find the turbidity a transparency tube was used, which was filled with water that was let out until the bottom could be seen. Water temperature was taken using a thermometer held at least 4 inches under water for one minute and read through the water. Stream flow was calculated by measuring across two sections of the stream. The depth of the water was measured at four different points and the average of each section was calculated and the average of the two sections was then calculated. Those calculations provided the volume of water flowing across a given point in the stream. Objects were sent to float down the river, which provided the surface flow. We only had time for one trial for objects in the stream. If more time had been provided, the calculation would have been more accurate. To find the total flow, the average area was multiplied by the length and coefficient and divided by the average time.

PHYSICAL ASSESSMENT 3 by Charlie Brereton & Emma Brereton

Below is data concluded from measurements taken at New Hope Creek on the first day of ESSP.

7/24/2012, 9:45 AM

Interval Width Section Interval One
Width (ft.) Depth (ft.)
A to B 14.4 3.16
B to C 9 3.5
C to D 7 206
D to E 12 1.91
Total 42.4 11.17

Cross Sectional Area (ft^2): 118.29

Interval Width Section Interval Two
Width (ft.) Depth (ft.)
A to B 12 5.08
B to C 7 1.16
C to D 8 1
D to E 22 0.875
Total 49 8.115
Cross Sectional Area (ft^2) 99.47

Cross Sectional Area = Total width (ft.) x average depth (ft.)

Average Cross Sectional Area (ft^2) 217.76

 

Average Cross Sectional Area = cross section area (interval one) + cross section area (interval two) / 2

Travel Time (sec)
Trial 1 254.4
Trial 2 210
Total 464.4
Average 154.8

(217.76)(20)(0.85) / 154.8 = 23.914 (ft^3 sec.)

The above calculation consists of four parts: the length of the stream reach (20 ft.), the average travel time (154.8 sec.), a coefficient (0.85) and the average cross sectional area (217.76 ft^2).

Turbidity Measurements
Trial 1 66
Trial 2 56
Trial 3 35.5
Average 52.5

 

Water Temperature Readings (°F)
Trial 1 79
Trial 2 77
Trial 3 77.9
Average 77.96