*[https://www.pwdplanreview.org/upload/pdf/PWD_Stormwater_Details_Subsurface_Infil_Basin.dwg Pipe-in-stone infiltration] by Philly Water | *[https://www.pwdplanreview.org/upload/pdf/PWD_Stormwater_Details_Subsurface_Infil_Basin.dwg Pipe-in-stone infiltration] by Philly Water |