Volume/Peak Rate Control

Volume/Peak Rate Reduction SCMs provide other means of reduction that do not fit under classification of infiltration or bioinfiltration SCMs. SCMs of this nature do not recharge the groundwater, but provide for evapotranspiration and direct reuse.

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Hydrology Sampling

In a residential, suburban, urban and ultra-urban SCM, minimal equipment is needed to reach compliance. Storms should be monitored on a seasonal basis to determine the effectiveness of reducing the volume and peak discharge. Data can be compared to precipitation data from a nearby raingage using NOAA-ATLAS 14 (National Weather Service 2007). Storms should be monitored for:

  • Water elevation

Water elevation calculations can help in calculating the overflow. Overflow is important in determining the volume reduction.

Quality Sampling & Quality Parameters

Quality monitoring is not required for Volume/Peak Reduction SCMs at this monitoring level.

Ecology

Ecology provides the appeal of the site. Therefore, it should be reviewed seasonally for:

  • Diversity/Coverage

A review of diversity and coverage can help determine which plants thrive better in the environment. Additional plants can be introduced to increase evapotranspiration.

Hydrology Sampling 

Hydrologic monitoring is important at a commercial site because of the potential spills that may increase and contaminate flow through the SCM.  Therefore hydrology should be reviewed on a monthly basis for:

  • Total Precipitation

  • Water Elevation

  • Overflow

Water elevation calculations can help in calculating the overflow. Especially at this type of SCM where the probability of completely eliminating overflow is negligible, there is a better chance of a better reduction in peak flow. Additional precipitation readings can help determine the amount of water being introduced to the site.

Quality Sampling & Quality Parameters

Quality is important on industrial and commercial sites because of the potential for contaminant spills. Samples should be collected on a seasonal basis and tested for site specific chemical contamination or at the very least:

  • Physical Properties

Physical properties are important because they can indicate the potential for other pollutants and whether these pollutants are being eliminated between entry and exit, especially TDS because contaminants stick to solids.

Ecology

Ecology can be important in determining if there are high levels of toxins in runoff. Various toxins can lead to a noticeable decline in plant life or invertebrates. Tests should be completed on a seasonal basis unless funding allows for monthly review for:

  • Diversity/Coverage

  • Invertebrates

A review of diversity and coverage can help determine which plants thrive better in the environment. Additional plants can be introduced to increase evapotranspiration. Invertebrate studies can determine if the toxin levels are increasing or decreasing based on indicator species results.

Hydrology Sampling 

At research and educational facilities, the manpower and utilities are available to monitor all hydrological aspects. Therefore data should be recorded on a storm by storm basis for:

  • Total Precipitation

  • Water Elevation

  • Soil Moisture Content

  • Storage Volume

  • Overflow

Water elevation calculations can help in calculating the overflow. Especially at this type of SCM where the probability of completely eliminating overflow is negligible, there is a better chance of a better reduction in peak flow. Additional precipitation readings can help determine the amount of water being introduced to the site while soil moisture content helps determine the storage volume. Knowing the storage volume, can give a better understanding of the capacity of the SCM to retain water while reducing the peak flow. 

Design

Vegetated Roof

Runoff Capture and Reuse