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13. IRRIGATION CANAL STRUCTURES.- In the vicinity of station 1+00, the r:- igbt Oi;lnk levee wou Id cross the I nfake works of the Las Animas Consol idated Canal. (See plate 2, Intake Structure No. I.) This canal has a diversion right of 124.3, c.Ls. It is proposed to 1)10d i fy the structure by the add it ion' of 'facewa I I sand slab' over the ex i st i ng wa II s to carry the necessary levee fill. The three 4- by 6-foot wooden sluice gates of the intake structure would be replaced with cast- I ran s I i de gates with manua! lifts to prov I de pas i t i ve closure during floods. Detai Is are shOWn on plate 4. 14. In the vicinity of station 130+00, the right bank levee would cross the Las Animas Town Ditch which has a diversion right of 38 c.f.s. A structure wou,l d be requ i red for passage of i rr I gat i on water, wi th provisions for positive closure during floods. This structure, shown on plate 2 as Intake structure No.2, wou Id consist of adouble 5- by 5-foot concrete box culvert 52 feet long equipped with cast-iron sl ide gates'w i th manua I lifts. Concrete headwa I I structures wou 1 d be pi aced on each end of the box culvert. Detai Is of the proposed Intake struc- ture are shown on plate 4. 15. RIGHT BANK DRAIN DITCH.- A drain ditch would be constructed parallel to the right bank levee from station 295+00 to station 458+00 to dra in a II areas be low Area B, as shown on plate 8, append ix B. Th is ditch wou I d have a trapezo i da I cross sect i on, I O-f oat bottom width, and I on 2 side slopes. A berm 30 feet wide would be maintained between the toe of the levee and the ditch. This ditch would have a longitu": dinal slope of 0.001. A typical cross section of ditch and levee is shown on plate 4. 16. INTERIOR DRAINAGE STRUCTURES.- It wou Id be necessary to pro- vide hructuresfhrough the levees to drai n storm runoff intercepted by the' levees. The subd i v i sl onS of the dra I na!:le areas and recommended pondingareas are del i,neated On plates 7 and 8, appendix B., The pond- in'g areas ,also are shown on pi'ate 3 of this appendix. The locations of the interior drainage structures are Indicated on plates 2 and 3, and detai Is of typical structures are shown on plate 4. , a.Structure No.3 would be located at station 175+00 on the right bank, levee for dra I nage of Area A. 1"h i s structure wou I deans i st of a' 36- i ncn-d i ameter 12-9age cor;f-uga'ted meta I pipe 68 feet long, equipped with a cast-iron slide gate with manual 11ft on the landside and an automatic gate On the riverside. A 'ponding area would not be required as overflow would be discharged Intq Area B. b. Structure No. 4at station 282+00 for drainage of Area B would consist of a 60-inch-diameter 10-gage corrugpted me.tal pipe 6B feet long, equipped with a cast-iron sl ide gate with 'manual 1 ift On the landsideand automatic flap gate on ,the riverside. A ponding area of 20 acres with a capac i ty of 40 acr'e'-feet wou I d be requ ired, as shown On plate 3. A-4 R 1/28/64