FLOOD06541 - Laserfiche WebLink

Home Browse Search

J~ Mr. Charles Kelly July 23, 1973 Page Two This interceptor ditch will be installed compatibly with the existing culverts along the main road to the ski lift and will basically follow the contours of the area. The ditch will be soil-lined and will be designed for relatively low velocities, however, a rock lining can be added if scouring of the ditch occurs. Two outfall sites for the ditch have been located in the field and with some additional investigation, the best outfall site can be selected. ;; In addition, "e recommend that a second interceptor tiitch be constructed above the meadow site selected for the Village. This ditch will begin at a point north and east of the Village Inn and will run along contours to the north northwest and empty into the Schindel Haus ditch at a point directly west of the ski lift. This ditch will also be com- 'patible with the present culvert system and will intercept surface runoff above the proposed Village site, diverting it around the site, and routing it into Carbonate Creek. This will further reduce ground water in the vicinity of the Schindel Haus. If ground water lubrication of bedding planes in the Mancos shale continues to be a problem after construction of the interceptor ditches, a system of underdrains for the specific problem slopes, as discussed on page 9 of the soils report by Chen and Associates, could be used to increase s19pe durability. / .. Through the use of the drainage interceptor ditches (and the underdrain system if required), two of the three pre-existing conditions causing the problem at Schindel Haus will be eliminated or reduced. Further reduction in the potential for ground subsidence and slumping can be achieved by providing support to the east bank of Carbonate Creek. . Terracing can be accompltshed using gabion structures, anchored railroad ties, or anchored concrete cribbing de- signed specifically for this situation which will permit surface and ground' water to drain from the bank ,d thout per- mitting the sloughing or slumping of bank material which is t preseQtly occurring. The general area where terracing may be required is shown on the attached drawing. We believe that the use of interceptor ditches to alleviate the surface drainage problem and reduce the ground water problem in the vicinity of the Schindel Haus will greatly req~ce the difficultres presently being encountered. After 1 .