One SOB BM NO:192 near Goriarpar bus stand uses as reference BM (Bench Mark). The information of SoB (Survey of Bangladesh) reference BM collects from SoB. RL of the area collects from the BWDB (Bangladesh Water Development Board).
Location and Coordinates of Reference BM uses for Survey in Banaripara Paurashava as follows.
| SOB BM NO. | Location | Latitude | Longitude | RL_mPWD |
| SOB-192 | Near Goriarpar Bus Stand, Barisal | 220 45’ 13.39” | 900 19’ 08.20.84” | MSL 2.4269m
( Ref :BWDB ) |
Coordinates of the BM covers Latitude, Longitude and Ellipsoidal Height. Vertical height establishes in respect to mPWD datum using SOB BM as reference. Vertical datum of SOB BM is in mMSL. By adding 0.46 meter with SOB value the datum transfers to mPWD. 1st order BM Carry/Level Survey was conducted for datum transformation. Later on all BM paints and coordinates mark as per ToR specification.
Detail list of the three BM establishes for Banaripara Paurashava presents below.
| BM Information | Location | ||||||
| BM ID | Description | X | Y | Z | Ward | Mouza | Plot No. |
| 1 | Near Banaripara Institution Pilot School | 2759993.681 | 558333.0193 | 2.419 | 6 | Kundohar | 38 |
| 2 | South-east side of Banariapara Fire Service Office | 2760345.84 | 557759.0486 | 2.6 | 9 | Kundohar | 403 |
| 3 | East side of Banaripara Madrasha | 2760070.888 | 558883.4327 | 2.379 | 1 | Banaripara | 925 |
