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. . ~ ~f- ,6"\ ;"-~.;;J 6~A "lJiJ :..-J'-- ,-- . Rev.!sed -i-14.:s1 Dam Safety Branch Desiqn Review Unit Policy Book LSWT and ECD II. Applications shall be submitted to Division Engineer's Office (or Water commissioner) for the following actions: 1. Check for normally dry stream a) Must be dry more than 80 percent of the time. 2. OUtlet requirements a) Division Engineer's decision 3. Completeness of data 4. Place Division and District on form 5. Place stream code on form 6. Initial original application indicating approval B. The structures shall be constructed in accordance with the State Engineer's Standard specifications. C. The downstream end of spillways must be located at least 20 feet below the toe of the dam. D. We will accept filings for LSWT which are five feet or less in height from the bottom of the channel to the bottom of the spillway and which impound two acre-feet or less of water. for the record. The structures shall be constructed in accordance with our specifications except for the spillway width tables. E. There is no minimum size for an Erosion Control Dam. F. A livestock Water Tank or an Erosion Control Dam will be assigned a current priority number regardless of when it was constructed. -The number will be assigned when approved or accepted for filing. No distinction is made between a Livestock Water Tank or an Erosion COntrol Dam when assigning a number. G. Height of dams shall be measured vertically from the lowest point of the upstream toe to the crest of the spillway. [Reservoir Dam, Section 37-87-105, C.R.S. (1983 & 1986 supp.), are measured vertically from the centerline]. The scs "gully' formula is not used in Colorado for determining the height of a dam. Minor gullying of up to 50 square feet in the valley floor may be disregarded in determining the valley floor elevation. Maximum height shall not exceed fifteen feet and the minimum freeboard between the spillway crest and the embankment crest is four feet.