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HomeMy WebLinkAboutDrainage Reports - 12/15/1983I STORM DRAINAGE REPORT FOR LEMAY-HARMONY SPECIAL IMPROVEMENT DISTRICT #78 (OAK RIDGE PORTION) DECEMBER 15, 1983 Ift CITY OF FORT COLLINS FROM JAMES H. STEWART AND ASSOCIATES, INC. CONSULTING ENGINEERS James H. Stewart and Associates, Inc.' STORM DRAINAGE REPORT FOR LEMAY-HARMONY SPECIAL IMPROVEMENT DISTRICT #78 (OAK RIDGE PORTION) INTRODUCTION: That portion of the proposed Oak Ridge Subdivision which is to be included in the Lemay-Harmony Special Improvement District (S.I.D.) #78 is located in the West half of the Northwest 1/4 of Section_6, Township 6 North, Range 68 West of the Sixth P.M. in the City of Fort Collins, Colorado.. The site is zoned mostly Business, with some Residential. A primary reference is the McClelland and Mail Creek Major Drainageway Plan, December 1980. In this report, this study will be referred to as the McClelland Drainage Study. EXISTING DRAINAGE: The McClelland Thalweg moves through the North 1/4 of the proposed area in a Southeasterly direction (See Exhibit #1). Drainage moves toward the McClelland Thalweg South from Harmony and North from a mild ridge running East and West through the Rule property. From this same ridge, runoff moves South to an existing thalweg running East and West which is located approximately 500 feet North of the Oak Ridge South property line. Drain- age moves North to this thalweg from Mail Creek Ditch, which is located South of the Oak Ridge South property line. (See Exhibit #1). PROPOSED SITE DRAINAGE: 1. Oak Ridge Business Park, First Filing. The Oak Ridge Business Park, First Filing, is shown as Phase 1 on Exhibit #1. Proposed drainage in this area is described in the Oak Ridge Business Park, First Filing, Storm Drainage Report UO' and the reader is referred to this report. The following ex- ceptions are noted: Exhibit #1 shows an additional inlet on the Northwest corner of Oak Ridge Drive and Wheaton Drive, ® labeled "Inlet Z." This thl et was located at this point to receive runoff from the Eastbound lanes of Harmony Road, once curb and gutter are .placed along Harmony. This flow equals ' 5 c s. The addition of "Inlet Z" also prompted the relocation o e 18-inch sti�h-ul from the inlet Located on Oak Ridge Drive to "Inlet Z." The remainder of the storm drain which empties into_McCle_llans Thalweg on the East side of Wheaton was increased in size from NE* A o James H. Stewart and Associates, Inc. a 21-inch to a 21-inc,h to handle the increase ir�f;low from HarmonyRoad. Everything else is the same as spelled out in the Oak Ridge Business Park, First Filing, Storm Drainage Report. The reader is referred to this report for specifics. 2. Improvements to McClelland's Thalweg. McClelland's Thalweg, as it traverses through the Oak Ridge property; is intercepted by two streets, Oak Ridge Drive and Wheaton Drive. In each case, the 10-.ear devel_o,ped_.r_uno_f_f is carried_u.nd�._e roa , ii w a the remainder of the ]DO - The 10-year developed flow to be carried under Oak Ridge is 59.0 cfs, which requires two 33-inch culverts with flared endd sec ti'ons. Likewise, the 10-year developed flow to be carried under Wheaton is 90 cfs, which will require two 32-inch by 49-inch elliptical culverts. The channel sections for the improved McClelland Thalweg were designed to carry 100-year flows under fully -developed conditions. The channel sections vary as the thalweg.moves across the Oak Ridge property. The locations of varying channel sections are shown on Exhibit #Land the section details are shown on Exhibit #2. These sections are labeled A -A, B-B and C-C. The off -site, 100-year fully -developed flow from McClelland's basin, after detention, equals 55 cfs. This flow enters the proposed Oak Ridge site via an existing 27-inch by 44-inch arch pipe under Lemay and Harmony. Channel Section A -A is. designed to handle the off -site flow of 55 cfs. As the thalweg moves from Harmony to Oak. Ridge Drive, the on - site runoff equals 116 cfs (A=15.6 acres, C=0.85�acres). This flow.is added to the 55.0 cfs off -site flow and equals a total of 1_7_1c_f_s._ Channel Section B-B is designed to handle this total flow. Similarly, the thalweg continues from Oak.Ridge Drive to Wheaton D�e, accumulating additional runoff from a total area of 42.0 acres, which includes most of Oak Ridge Business Park, First Filing. The total flow, which includes the 55.0 cfs off -site flow, equals Section C-C was designed to handle this total flow. The improved thalweg is not to be constructed until exact alignment of the proposed channel is established by the developer. ,12WQ YJNi�A'MAJ 3. Storm Drain Designrfrom Rule Drive to Boardwalk Drive. The storm drain system which carries the runoff from areas A, B, C, D and E is designed to carry 10-year fully -developed -2- James H. Stewart and Associates, Inc. flows which will empty into the existing thalweg, located just East of the Wheaton - Boardwalk intersection (See Exhibit #1). °Inlet R," located on the Northwest corner of Wheaton and Rule, receives a flow of 25.5 cfs, which is transported South down Wheaton via'a 24-inch storm drain until it is intercepted by runoff from Area B. At this point, the combined 10-year fully -developed flow from Areas A and B equals 48 cfs, and the storm drain increases to a 30-inch pipe, which goes all the way to the manhole at the intersection of Wheaton and Boardwalk. This manhole also receives runoff from half the street of Rule Drive and Boardwalk Drive, and that portion of Wheaton (K between Rule and Boardwalk. This 107vear flow equals 5.7 Ml - cfs and empties into "Inlet S" See Exhibit fl . Additional runoff enters the same manhole.via a 34-inch by 53-inch elliptical pipe. This is accumulative runoff from (/ „ Area C and 240 off -site acres West of Lemay Avenue. Three 30-inch culverts (determined by others) carry a 10-year existing -condition flow of 53 cfs from off -site under Lemay and empties into Open Channel "D". Open Channel "D" also carries 10-year fully -developed runoff from Area C which, when combined with the off -site flow, equals a total of 71_ cfs. This total flow is conveyed to the manhole at the intersection of Wheaton and Boardwalk via the_34-inch by 53-inch elliptical pipe. The combined Ig:year flow_whi.ch exits this manhole via a 38 zinc,, ,.ym 0 ch e_, 1iipti�cal pi,pe eU s.104 cfs.._ This flow then empties into the.existing thalweg East of the Wheaton- Boardwalk intersection. Inlets "T" and %". located on the Northeast corner of heaton.and Boardwalk, receive a total flow of 8.4 cfs from. Area D.for 10-year fully -developed conditions. This flow is conveyed via a 15-inch and 18-inch pipe to "inlet V," which is located on the South side of Boardwalk. "Inlet V" receives 4.1__cfs from Area E for 10-year�„full,ywd_. y apEd conditions. The total 10-year fully -developed flow from Areas 0 °nd E equals 11.7 cfs and empties into the existing thalweg East of the Wheaton - Boardwalk intersection via an o 18-inch pipe. The runoff for the remainder of land between Area E and the South property line of Oak Ridge will find its way overland to this thalweg. 4. Major Storm Design from Rule Drive to Boardwalk Drive. Open Channel "D" is designed to carry the 100-year off -site existing -condition flow West of Lemay and the 100-year fully -developed flow from half of Area C. This total flow equals 125 cfs. See Exhibit #3 for a section d� eetail of � `NG ENC s N in A'" -3- t, M �0 NN c�` James H. Stewart and Associates, Inc. NG EN A Open Channel "D". The portion of.125 cfs that is not taken by the storm drain system will spill over the intersection into the existing thalweg located on the East side of the. Wheaton - Boardwalk intersection. Runoff from Areas A, B and half of C under.1OO-year fully - developed conditions finds its way down. Wheaton Drive, where it is carried to and through the intersection of Wheaton and Boardwalk into the existing thalweg,East of this intersection. The 100-year runoff for fully -developed conditions from Area D spills over the intersection after the storm drain system reaches its capacity. The 100-year total f_ ow at the entrance to the_exsti_nq,thalweg just East of the W5eaton - Boardwalk intersection is HE fs. Designed by Guy F. McCabe Written by Don J. McClelland -4- James H. 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