Final-Technical-Assessment-H-Water-Quality-v2.pdf [pdf, 1.9 MB]
...for attenuation of storm flows; (f) Soakage to groundwater where ground conditions allow, ie in the area east of Levin at the Tararua interchange and/or Queens Street flyover; and (g) Discharge outlet to watercourse, with appropriate erosion protection. Page 4 34. The treatment train applied for each stormwater device is shown in Table H.1 and the length of road contributing to each catchment in Table H.2. Stormwater from the road alignment discharge to surface water exc...