Stormwater Symposium

Oral

396420 - Flow Resistance in Regenerative Step Pool Stormwater Conveyance Structures

Tuesday, June 5
10:30 AM - 12:00 PM
Location: Mirage Room
Co-Authors: Elizabeth Hickman, Blacksburg, VA – Virginia Tech

Regenerative step pool stormwater conveyance (SPSC) structures are used for both stormwater management and stream restoration. This project conducted field-scale flow studies on two existing SPSC structures used as outfall protection from stormwater pipes. Water levels were measured continuously for one year and stormwater velocity and discharge were measured for at least five flow events at each site. Using these data, roughness coefficients were determined for the two SPSC structures. These coefficients are important design parameters that are often underestimated in steep channels. Study results confirmed that current design recommendations for Manning’s roughness coefficients (0.03-0.05) are significantly lower than measured values, which could result in actual water velocities that are much lower than predicted. This over prediction of flow velocity could result in SPSC structures that are too small to contain the design 100-yr discharge. It is recommended that Manning’s n values be increased by an order of magnitude to reflect the increased roughness in SPSC systems constructed on hillslopes with gradients over 5%.

Theresa Maria Thompson


Biological Systems Engineering, VA Tech

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