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Vanasse Han en Srustlin,Ina
VkIB �
-- - ----Transportation,Land Development,and ___ Project-# 72188-CT Studios.
Environmental Services Location South Windsor,CT
54 Tuttle Place Design Storm(Years) 25
Middletown,CT Date 7/25/2011
r Revised
Designed By. GAA
Checked By
Checked By
FIND: MINIMUM MEDIAN STONE DIAMETER(D50)AT EACH FLARED END STRUCTURE(FES)
MINIMUM DIMENSIONS OF FES APRON
GIVEN: 1.EQ. FOR LENGTH OF FES APRON:
(source:Rl Stormwater Design Manual)
1.7 Q Q= pipe discharge(CFS)
[a= pQ3/2 + 8Do ; where Do= maximum inside
culvert width(ft)
2.EQ. FOR WIDTH OF FES APRON*:
(source:R1 Stormwater Design Manual)
W= 3 Do+La where La= minimum width of FES
.apron(ft)
*Note: Assumes tailwater depth Do= as described above
is less than 1/2 of D,,
3.EQ. FOR MEDIAN STONE DIAMETER:
(source:Rl Stormwater Design Manual)
0.02 Q 4/3 TW= tailwater depth above
duo= TW Do where invert of the culvert
(ft)
Q, DO= as described above
4. Tailwater Depth=0.2-OA feet.
(Assumed value used to reduce the effects of tailwater on velocity
dissipation to neglible levels)
' 5. Values of Q at each FES.
(Source:HydroCAD hydrologic model By VHB)