Hi,
As promised in our previous weekly meeting, I have attached both excel files for calculating set times for irrigation.
If you enter the same moisture block reading for the matching section, you will see the N-75% efficiency table yields a higher Max gross irrigation allowed, therefore a longer run time. The City does have the ability to use this table, but must extra steps when using it.
This process to use the N-75% efficiency table is vaguely spelled out in the Recycled Water Plan, however when using the N-75% efficiency tables last year the following was done:
· Notified DEQ we were using the lower efficiency table for the big guns only,
· documented the startup and the first week with photos showing no run-off from the applied water,
· printed these sheets daily and kept them in the binder with the readings for record keeping,
· provided the startup & first weeks documentation with photos to DEQ,
· and hand lines were restricted to using the N-85% efficiency table only.
Let me know if you have any questions, we can discuss next week on Tuesday if needed.
Thanks,
Jennifer Cline, P.E. | Public Works Director
Licensed in OR, WA
117 N Molalla Ave. | PO Box 248 * |Molalla, OR 97038
O: 503.759.0218 | F: 503.829.3676
