Technical Results
Driveways

Three different types of driveway surfaces were investigated in this portion of the study: Ecostone® concrete block pavers, crushed stone and traditional asphalt. The crushed stone driveways had the least amount of runoff over the course of the 22 month study, with a mean of 0.04 mm. Runoff from the Ecostone® driveways was significantly higher at 0.5 mm, and runoff from the asphalt driveways was significantly higher than both of the other driveway types, at 1.8 mm. As would be expected, pollutant export was highest from the asphalt driveways (Table 1), because of the greater volume of runoff produced. As expected, infiltration rates varied between the pervious driveways and ashphalt driveways (Table 2).

More detail on this study can be found in the following reference:
Gilbert, J.K., and Clausen, J.C.  2006. Stormwater runoff quality and quantity from asphalt, paver, and crushed stone driveways in Connecticut. Water Research, Vol. 40, pp. 826-832. 

Table 1. Annual pollutant export from
different driveway types (kg/ha/yr).
Table 2. Mean (+/- s) infiltration rates from asphalt, paver and crushed stone driveways.
Asphalt
Paver
Crushed
Stone
TSS
230.10
23.10
9.60
NO3-N
1.78
1.25
0.15
NH3-N
0.65
0.12
0.03
TKN
13.06
1.08
0.47
TP
0.81
0.25
0.04
Test & Year
Asphalt
(cm/hr)
Paver
(cm/hr)
Crushed
Stone (cm/hr)
Single Ring 2002
0
11.8 ± 9.5
11.3 ± 3.1
Single Ring 2003
0
10.5 ± 5.9
9.7 ± 7.8
Flowing 2003
0
11.4
6

 

 



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