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- A -, <br />To evaluato the feasibility of the above-, z uc proe� the <br />area ims divided into the 'Lollowing evaluation (1) - L:'- , Le mains - cm <br />of cast: Plma Croc'< from struct. silzes EP-1 and �1 (aID t <br />intersection of East Plmm and Carpantei7 C eohs) doim to Caotle Rock; <br />(2) Sellers and Yljomm'm Gulches from bolo S"t:Xuc_M_ s i. i es EP-3 and E1 <br />do to the -interaection vi. th East Plui Creek; and (3) th-a throe <br />co-mbination grade stabilization and 3txuc`k Oil <br />Cook Creek, Cax-pevtter Creek, and Smit Gulch, <br />Evaluation Unit 1 — Mainstem East Plum Crcch <br />To protect the mains•en, of :Eazt Plum Cracn - fro.m flooa7,):atc): da <br />it i dotes amine-d that tlere were two uossiblo dc s which would. <br />reservoir 64 Der cent of the area & bOVe .!. LRO I'LOT.7n of lzuckspur, Floodwater- <br />xetarding structure nmd-,er EP 1. located at the in of Ee-at <br />Plima Creek and Cook ("'ree]k ,, d control t3ao runoff from 29,1 square <br />miler. of drainage area with a total storage ca Of 2 acy—efeet, <br />Structure nutiLber EP-2, located in - the east fork of C(ar Creek, <br />would reservoi- 7,6 square miles of drainage area witli a 1- storage <br />capacity of 486 acre-feet of storage.. The ei-sthrated total cos of <br />these two structures is $326,492 with an ave annual cost of <br />$13,327, (See Tables 2 and 6), <br />It would. be very desirable to have at least one additional large <br />stru-c site or a site which would reservo mor-a of - 1 1 -I'lic cLrainage <br />area, since it is estimated that razervoiring 64 par cen-L of the area <br />above Larkspur urill reduce flood damages on the mainstam of East Plum. <br />Creek by only 41 per cent, This additional structure sit:..- does not <br />appear feasible because of the location of railroad tracko, highvrdys, <br />cropland, and. farm buildings. <br />Frcm the aerial photographs, previously mentioned, it iras de•emined <br />that the flood frcm the intersection of East Plim, and Carpenter <br />Creeks domm to Castle Rock is ap.proximately 680 acres, Of this acreage, <br />170 - ages ara ir alfalfa or meadow hay, 60 acres are - Ln good pastuz. <br />and 450 acres a3 In channel waste or poor pasture The total gross <br />value of agricultural production in this floodpla_jn area 1 ILS 812 <br />Per Year, This total is less than the average annual cost of the <br />structures needed to protect the floodplain 2xom flooding as estimated <br />in the paragraph. above, <br />