2026 02 12 Crestmont CC and Eagle Rock Ave Stormwater Management Report

ANTI-SEEP COLLAR DESIGN PROJECT NAME: Crestmont Country Club & Eagle Rock Ave Improvements PROJECT LOCATION: West Orange, New Jersey BASIN ID# SSBB-1 DONE BY: TEG DATE: 10/17/25 CHECKED: MJV DATE: 10/17/25 OUTLET PIPE: INVERT UPSTREAM (Yup) 530.25 INVERT DOWNSTREAM (Ydn) 526.80 PIPE RISE: 18 inches PIPE SPAN: 18 inches PIPE LENGTH: 47 ft PIPE SLOPE (So): 0.073 100-YEAR BASIN ELEV. (Y100): 536.73 EMBANKMENT SLOPE (Z): 1 (EXAMPLE 3:1 SLOPE -> Z=3) CALCULATIONS: Y=Y100-Yup= 6.48 Lsz=Y(Z+4)*(1+(So/0.25-So))= 39.53 ft SAFETY FACTOR Lsz*1.15= 45.47 ft USE Lsz= 45.00 ft SPACING DESIGN: COLLAR WIDTH(OR DIAM.): 7.00 ft NO. OF COLLARS REQ.: 0.30 =(L-Lsz)/2*collar width USE 1.00 collars MAX. SPACING ALLOWED: 14.00 ft =14ft*no. of collars CALCULATED SPACING: 39.53 ft =Lsz/(no. of collars) USE LESSER OF MAX. OR 14.00 CALCULATED SPACING: ft COLLAR DIMENSIONS FOR OUTLET PIPE: USING RECTANGULAR COLLARS, THE DIMENSION OF THE HEIGHT SHOULD BE: 7.00 ft =2*2'+pipe rise WIDTH SHOULD BE: 7.00 ft =2*2'+pipe span THICKNESS TO BE: 12 inches