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I I CHAPTER VII - PROJECT EVALUATION I This project is proposed to rehabilitate an existing storage facility for The North Poudre Irrigation Company. The majority of water in the North Poudre System is for agricultural irrigation I use. I I I The Rehabilitation of Reservoir No. 15 will allow the Owners to store approximately 5,560 acre-feet. Current restriction by the Colorado State Engineer reduces storage to 4,910 acre-feet.. This restriction has bccn effective since approximately 1976. It IS estimated that in the future restrictions would Curther reuuce storage to 3,264 acre-feet. I I The following chart was prepared to illustrate storage 1n Reser- voir No. IS over the next 20 years without the rehabilitation pro- ject. This chart was preparcd by mysclf, Jackie Malcolm, and is based on the observed rate of deterioration over the last 10 years, the elevations of the existing toes, and a comparison of dam thick- ness at the stated storage elevations. It is my opinion that were no work at all completcd on the cmbankment that restrictions 00uld be accelerated beyond those stated herein; meaning more severe restrictions would be imposed sooner. In order to maintain the following schedule, certain repairs and maintenance cost should be contemplated. These would include such items as repair existing outlet, construct new downstream drop structure and parshall flume, emergency access, and additional riprap. I I I I I I I I I I 1986 1996 2006 2016 Gage Rod Elevation - Fect 38.0 36.0 34.0 obsolete Storage Acre - Feet Ycar 4337 3786 3264 . -0- This chart illustrates that after 20 or 30 would be obsolete and at that time require years, the Reservoir a major rehabilitation 28