Design Guide
Page 23
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05/15
Figure 12 – Perpendicular Chamber Connection
7.8
Maximum Inlet Velocity
Water entering a chamber row too rapidly can potentially scour the foundation stone, leading to
foundation issues in the chamber system. To prevent this, the maximum velocity should not exceed
the values listed in Table 8. For velocities greater than those listed in Table 8, scour protection
should be used to assure no loss of stone and subsequent foundation strength. The use of a 15’
wide strip of an AASHTO M288 Class 1 non-woven stabilization geotextile under each chamber inlet
row is a simple method to protect the stone from scour and structural loss. (Figure 13)
Table 8 - Maximum Inlet Velocity without Scour Protection
Inlet Pipe
Diameter,
inches
Max
Allowable
Flow Rate, cfs
4
2.43
6
2.61
8
2.73
10
2.44
12
2.19
15
2.00
18
1.88
24
1.74
Figure 13 - Inlet Scour Protection
Summary of Contents for HydroStor HS180
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