6 0 Retention Detention Systems

Manual Saliran Mesra Alam (MSMA)

3.0 ON-SITE DETENTION 3.1 Principles of Quantity Control Stormwater quantity control facilities can be classified by function as: (i) detention, or (ii) retention facilities. The detention concept is most often employed in urban stormwater drainage systems to limit the peak outflow rate.

  Manual, System, Retention, Detention, Lmaa, Msma, Smear, Manual saliran mesra alam, Saliran

Unit Price Schedule - Fairfax County Homepage | Fairfax County

Select Backfill, 0'-6' Deep (3"-24" pipe) $ LF Trench De-watering $ LF ... Extended Detention and Retention Riser Structure $ VLF Manufactured BMP Systems - Hydrodynamics $ CY Manufactured BMP Systems - Filtering $ CY Permeable Pavement System - Asphalt with gravel base and perforated drains, brick & grass pavers with ...

  System, Retention, Detention

soakage design manual - Drainage NZ

On-site stormwater management The detention and/or retention of runoff on a site before discharging it to a disposal system Orifice A hole of a specified size designed to discharge flow at a pre-determined rate (it is normally machine-drilled in a plate and attached at the entry to a pipe) OSM device An on-site stormwater management

  Retention, Detention

N-12 ST IB Pipe (per AASHTO)

diameters shall be one foot (0.3 m), and for 60-inch (1500 mm) diameters, the minimum cover shall be two feet (0.6 m) in single run applications. Backfill for minimum cover situations shall consist of Class 1 (compacted), Class 2 (minimum 90% SPD) or Class 3 …