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j . . Ms. Sheila Beissel June 6. 1990 Page three Stream Reaches_To Be Delineated A significant number of stream reaches for which approximate information is, shOl.m on l:l1e Flood Insurance Rate Map (FIRM) are proposed for elimination from that map. We believe there are a few stream reaches for which such elimination should be reconsidered, As we said earlier. it appears that flow information for Basin C (approximately 300 acres) could be generated. We recognize there is some steep terrain. some golf course area. and some open space. For that reason we could accept elimination of C and Cl. but we think that first a little more consideration to keeping them on the map should be give. At the downstream end of Basin F a flow of 480 c.f.s. 100as calculated. The area is 237 acres. slightly below your cutoff area of 250 acres. At the downstream end of Basin H a flow of 460 c.f.s. was calculated. Thl! area is 230 acres. again close to the cutoff of 250 acres. Both stI:eams cross Stone Quarry Road near the cemetery. From there they flow between areas to be developed. The land between the two development areas appears to be open space. Even with the possibility of the drainageway being open space. we would suggest consideration be given to keeping floodplain information on the map for these two drainages from Stone Quarry Road to the Colorado River. The final basin we want to discuss briefly is Basin II. From your report we surmise that the figure on Table 3 for drainage area should be 230 acres. not 3.230 acres. 230 acres would agree with the information on Table I and Drawing 1. If that is correct. then at the downstre,3.m end of the Jacks Pocket Village subdivision the drainage area is about 200 acres. In that _case we would agree that Basin II constitutes a local drainage problem. not a flOOdplain. and it does not need to -remain on the FIRM. If the are,a is much larger. then the question needs to be reconsidered. 1 In summary. we feel a little thought should be given to keeping delineations on the FIF;M for Basin C. Cl and II. We feel that delineations should remain on the maps for Basins F and H downstream of Stone 'Quarry" Road..