Good morning,
We are working in a Project in Asunción, Paraguay. In the form of the credit, you have two tables, i have three questions:
1- The value of rate (cm) in the table is the runoff equation of the NRCS method?
2- The value of quantity (cm/storm) in the table, is the quantity of the storm event or the volume? I thought it could be the volume, but the measurement unit (cm/storm) suggests that is the value of precipitation 24 hours.
3- In the case of the project, water will be stored in a tank to achieve the requirement of credit. This volume of water is used to irrigate landscaping. The demonstration that this storage achieves prevent the postdevelopment peak dicharge rate and quantity exceeds the predevelopment peak discharge rate and quantity, must be done in the stormwater management plan? If this is so, the table values are higher post development to pre development?
Thanks in advance for the answer
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Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
August 31, 2016 - 10:34 am
Hi Gabriela, I'm sorry but I am not following your question, specifically the "table" that you are speaking of.
However, rate is measured in cubic feet/second or cubic meters/sec and volume (the runoff quantity) in cubic feet or cubic meters.
Unless your project results in a lower overall curve number from the pre-development condition, your post development runoff rate and volume will usually always exceed the pre development. This is the reason why BMPs, such as storage tanks for irrigation are proposed.
I hope this helps.
Gabriela Mesquita
LEED AP BD+CARKÉ
3 thumbs up
August 31, 2016 - 12:11 pm
Hi Michael, the table is in the form of the credit SS 6.1. Case 1. Existing Imperviousness 50% or less. Table: Site Runoff: One year, 24 hour design storm, and Table: Site Runoff: Two year, 24 hour design storm.
In those tables, rate it´s in (cms) and quantity in (cm/storm), boths units are confusing, so isn´t clear wich value have to place there.
Thanks in advance for the answer