EQUIPMENT--DH-81 Suspended-Sediment Sampler In Reply Refer To: June 16, 1986 WGS-Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 86.06 Subject: EQUIPMENT--DH-81 Suspended-Sediment Sampler The DH-81 suspended-sediment sampler is now available from the Federal Interagency Sedimentation Project (FISP) at St. Anthony Falls Hydraulics Laboratory in Minneapolis, Minnesota. The DH-81 sampler is actually made up of four parts: (1) 5/16-inch nylon nozzle; (2) plastic cap; (3) adapter; and (4) wading rod (see attached figure). Each of these parts needs to be pur- chased separately. The nozzle ($10) is the same nozzle used in the D-77 sampler. The wading rod ($15) is the same wading rod as used with the DH-48 sampler. The cap ($11.50) is a modification of the D-77 cap. One of the four aligning ridges has been removed to allow it to fit into the adapter ring. Any bottle with a standard mason jar thread will fit into this cap. The adapter is a ring into which the cap and wading rod will connect. It has three slots into which the alignment ridges will fit. This ensures that the sample is prop- erly aligned with the wading rod handle. The FISP is offering the adapters free to the Water Resources Division this fiscal year only. Please order what you need this year; next year the cost will be $6 each. There are several advantages to this sampler: (1) it is relatively inexpen- sive--total cost is under $50 compared to over $100 for a DH-48; (2) it can use any bottle which has a mason jar thread, thus allowing for different volumes of samples to be collected; (3) it is lightweight and easily assembled and disassembled; and (4) it can be autoclaved. The nozzle, cap, and adapter are all made out of material that can be sterilized by autoclaving, thus allowing the user to collect depth-integrated samples for bacterial analysis. Anyone wishing to purchase this sample or obtain the free adapters should contact John Skinner or Don Benson at the FISP (FTS 787-3352). Verne R. Schneider Chief, Office of Surface Water Attachment WRD Distribution: A, FO-L, PO This memorandum does not supersede any previous OSW Technical Memorandum.