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The Office of Water Programs

The Office of Water Programs. LID Implementation Challenges: Monitoring and Measuring Results. Select OWP Experiences. Christian Carleton, P.H., CPSWQ, CPESC Brian Currier, P.E. David Alderete. Field monitoring guidance Results of testing at Sacramento State. Field Monitoring Guidance .

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The Office of Water Programs

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  1. The Office of Water Programs LID Implementation Challenges: Monitoring and Measuring Results Select OWP Experiences Christian Carleton, P.H., CPSWQ, CPESC Brian Currier, P.E. David Alderete Office of Water Programs — 2010

  2. Field monitoring guidance Results of testing at Sacramento State

  3. Field Monitoring Guidance • Flow Monitoring Issues • Accurate rain gauges and drainage areas • Influent flume sizing • We know large storms bypass, so why size flumes to monitor what we already know? Size flumes up to the design storm for water quality purposes • 0.16 in/hr is a common water quality design intensity, so 0.5 in/hr may be reasonable for a good range of storms. • Effluent flume sizing • Smaller flumes should be used for flows from filter media or orifice-controlled outlets

  4. Field Monitoring Guidance • Do not ignore small events • Monitor flow on the small events and consider a few water quality events as bonus data • There is far more uncertainty in the hydraulic performance than there is in the quality of filtered water, so focus on the flow! • Small storms are avoided to minimize ‘false-starts’ for water quality samples due to insufficient volume to collect a minimum number of aliquots.

  5. Results of Testing at Sacramento State • 80/20 Sand/Compost • Initial hydraulic capacity can be very high and depends on drying • Maximum was nearly 500 in/hr • Mostly-saturated hydraulic capacity ranged from 40 to 60 in/hr, though as low as 17 in/hr was observed.

  6. Dry-weather flow negatively impact LID systems Soil doesn’t have a chance to dry out How does it happen: Raised-landscaping runoff Irrigation overspray Vehicle/street/sidewalk/driveway washing Results of Testing at Sacramento State

  7. Results of Testing at Sacramento State • Treatment is governed by hydraulics • Instantaneous and short-term treatment tests are very misleading • Filtered vs. bypass depends on: • Media type, depth, area, and ponding depth • Local hydrology • Catchment size and shape

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