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<br />The Ralston Creek basin at its confluence with Clear Creek con-
<br />tains 91 square miles. The 1 percent flood (1 DO-year) is of
<br />destructive magnitude given the significant development of the
<br />flood plain in some areas, The studies show the 1 percent flood
<br />to be 10,000 cubic feet per second within Arvada for future de-
<br />velopment with the improved channel without detention on Van
<br />Bibber Creek. Early warning plans and arrangements are part of
<br />the overall recommendations.
<br />
<br />Overall, the master plan calls for a corrective program costing
<br />$13,2 million in terms of 1977 dollars, Some $9,9 million of
<br />this program is in Arvada and $3,3 million is in Jefferson County,
<br />
<br />Douglas T, Sovern, J, Craig Green, and Leander Urmy of our staff
<br />have made a concentrated team effort in completing this study,
<br />Arvada and Jefferson County have input heavily to the study.
<br />
<br />We have appreciated the opportunity to undertake this study,
<br />We remain available to help implement this master plan,
<br />
<br />
<br />I
<br />
<br />WRIGHT-McLAUGHLIN ENGINEERS
<br />ENGI NEERING CONSULTANTS
<br />
<br />COMPI-ElE ENGINEERING SERVICES
<br />IN THE THE SPECIALlY nELOS OF
<br />
<br />RONALD C, MCLAUGHLIN
<br />KIONNETH Fl. WRIGHT
<br />HALFORD E. ERICKSON
<br />DOUGLAS T SOVERN
<br />WILLIAM C TAGGART
<br />THOMAS W MORRIS
<br />
<br />Z420 ALCOTT STREET
<br />DENVER. COLORADO 80211
<br />0303,4'513-6201
<br />
<br />WATER SUPPLY AND DISTRIBUTION
<br />WATER AND SEWAGE TREATMFNT
<br />SEWAGE COLLECTION AND REUSE
<br />STORM DRAINAGE
<br />FLOOD CONTROL AND
<br />OTHER WATER-ORIENTED PROJECTS
<br />
<br />,I
<br />
<br />A.SPe:N
<br />POBOX 6028
<br />ASP!: 1'1, COLORADO 816 I I
<br />
<br />GLENWOOD SPRINGS
<br />PO. BOX IZ86
<br />GlENWOOD SPRINGS
<br />COLORADO 81601
<br />
<br />JIMMIE:: D. WHITFIELO
<br />JOHN T MCLANE
<br />DAVID J LOVE
<br />RONALD B CLONINGER
<br />
<br />I
<br />
<br />I
<br />
<br />I
<br />I
<br />
<br />September 16, 1977
<br />
<br />Mr. L. Scott Tucker, Executive Director
<br />Urban Drainage and Flood Control District
<br />2480 West 26th Avenue, Suite lS6'B
<br />Denver, Colorado 80211
<br />
<br />I
<br />
<br />I
<br />
<br />RE: LETTER OF TRANSMITTAL
<br />
<br />I
<br />
<br />Dear Mr. Tucker:
<br />
<br />I
<br />
<br />The master planning effort for Ralston Creek and Leyden Creek is
<br />summarized in this report in accordance with our contract dated
<br />October 1, 1974.
<br />
<br />I
<br />
<br />This text includes a summary of the Phase A report, so that the
<br />background material is available for the reader's convenience,
<br />Section I presents an executive summary that describes the general
<br />study and results,
<br />
<br />I
<br />
<br />Yours very truly,
<br />
<br />The master plan for Ralston and Leyden Creeks represents a combin-
<br />ation of flood control management methods ranging from merely flood
<br />plain regulation to concrete side,walled European-type channels,
<br />Each portion of the two streams was studied separately and the
<br />best solution was selected in conjunction with local government
<br />representatives.
<br />
<br />I
<br />
<br />By
<br />
<br />I
<br />
<br />The recommended plan for Ralston Creek and Leyden Creek flood hazard
<br />management is based upon minimizing the hazard to life and property
<br />along the full reach of the creeks, in harmony with providing reason-
<br />able and useful amenities consistent with accepted urban and rural
<br />planning principles.
<br />
<br />By
<br />
<br />I
<br />
<br />KRW:ms
<br />Attachment
<br />742'S9B
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<br />
<br />The master plan includes the relocation of approximately 60 perman'
<br />ent residential structures and S4 mobile homes, These homes are in
<br />the flood plain of Ralston Creek, For the most part, their removal
<br />is required to obtain room to construct a concrete walled channel
<br />through a residential area subject to heavy flooding.
<br />
<br />I
<br />
<br />I
<br />
<br />I
<br />
<br />STEAMBOAT SF'RINGS
<br />P,o. BOX ~220
<br />STEAMBOAT VILLAGE.
<br />COLORADO 80499
<br />
<br />LEAD/DEADWOOD
<br />9-:3 SHEIlM"'"
<br />DEADWOOD
<br />SOUTH DAKOTA 57732
<br />
<br />Partner
<br />
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