Environmental Engineering Reference
In-Depth Information
150
300
125
250
Flow (ft
3
/sec)
100
200
Suspended solids
(mg/L)
B
75
150
50
100
C
D
A
25
50
30
35
40
45
Julian days
50
55
60
65
Figure B-7
Precedence of hydrograph by chemograph for multiple storms.
subsurface pathway, which limited the applicability and transferability to other
watersheds. As a result, the simulated hydrographs predicted were much more
extreme in magnitude than the real hydrographs, while the peaks of concentration
preceded the hydrograph peak (Figure B-7).
Stormwater Management in the New Jersey Coastal Zone (1989)
The quality of water in the bays and estuaries of coastal New Jersey have been
affected by pollutants contained in stormwater runoff from land development for
several decades, and the associated degradation is a threat to one of the richest
finfish and shellfish aquatic environments in the country. The string of barrier
islands have provided shelter from Atlantic coastal currents and waves to create
a rich wetlands habitat, but the occupation and paving over of both the barrier
islands and mainland by increasingly larger residences and commercial parcels
have created significant impervious surfaces and generated a load of nutrients
from residential lawnscapes, golf courses, and other urban surfaces discharged
with every rainfall. The regional hydrology has also been altered, as the natural
sandy soils are sealed to increase runoff from 2 in. per year to some 43 in. on
impervious surfaces.
The 2,000-square mile drainage area (Figure B-8) had been the subject of
study by various investigators, and in 1989 the New Jersey Department of Envi-
ronmental Protection and Energy retained Cahill Associates to prepare a plan for
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