Discussion
321
TABLE 2
by
Edward H. Bryan
Source: Report No. 37, Water Resources Research Institute of the University of North Carolina,
Raleigh, N. C. (June 1970).
Basin Characteristics: Location - Durham, North Carolina
Basin Area - 1.67 square miles
Population Density - 9.7/acre
Classification of Uses:
Residential
59%
Commercial/Industrial
19%
Public-Institutional
12%
Unused
10%
Total
100%
Parameter
Minimum
Maximum
Mean (1)
Mean (2)
Biochemical Oxygen Demand (mg/1)
2.2
232
31.3
14.5
Chemical Oxygen Demand (mg/1)
40
660
224
179
Total Solids (mg/1)
274
13,900
3,930
2.730
Volatile Total Solids (mg/1)
20
1,110
426
298
Lead-mg/1
0.10
1.85
0.67
0.32
Fecal Coliforms per 100 ml
3,000
1,900,000
248,000
30,000
(1)
Results for all storms sampled, weighted in accord with discharge rate to establish rate
significance . . . 30 events during 14-month period. 1969 - 70.
(2)
Results for 17-storm series sampled more thoroughly and weighed in accord with discharge
rate to establish rate significance.
Pollutant Yields, Durham, N. C.
comparison with Tulsa, Oklahoma. (3)
Tulsa, Okla.
Biochemical Oxygen Demand
84 pounds/acre/year
1 2 - 4 8
Chemical Oxygen Demand
1,040 pounds/acre/year
60 - 470
Total Solids
15,900 pounds/acre/year
470 - 5100
Volatile Total Solids
1,730 pounds/acre/year
Phosphate
3.4 (total) pounds/acre/year
1 . 1 - 8 (sol)
Lead
1.9 pounds/acre/year
-
(3)
Proc. Symp. Storm and Combined Sewer Overflows, FWQA Chicago, 111., June, 1970 . . .
- Tulsa Data.